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Wai, Kok Poh, Chai Hoon Koo, Yean Ling Pang, Woon Chan Chong e Woei Jye Lau. "Synthesizing Ag/PDA/PES Antibacterial Membrane for Natural Organic Molecules Removal". E3S Web of Conferences 65 (2018): 05023. http://dx.doi.org/10.1051/e3sconf/20186505023.
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Silver nanoparticles (NP) was successfully immobilized on polydopamine (PDA) supported polyethersulfone (PES) membrane via a redox reaction. Polyvinylpyrrolidone (PVP) was added into membrane dope solution as a pore-forming agent. Four pieces of membranes (M1, M2, M3 and M4) were fabricated with different active layer coatings to compare their morphological and performance properties. The differences between each sample were highlighted as follow: M1 (pristine PES), M2 (PES+PVP), M3 (PDA/PES+PVP) and M4 (Ag/PDA/PES+PVP). All membranes were characterized using scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction and contact angle analysis. The membrane performance was examined using pure water permeability (PWP) test, antibacterial test and humic acid (HA) rejection test. Pristine M1 membrane showed that PWP of 27.16 LMH/bar and HA rejection of 84 %. In this study, it was found that the addition of PVP as a pore agent into the membrane M2 increased water flux but slightly deteriorated HA rejection. Coating of PDA on M3 and immobilizing silver NP on M4 membrane surface have improved HA rejection but compromised PWP. The results showed that membrane M4 carried excellent antibacterial property and highest HA rejection among all fabricated membranes.
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Junaidi, Nurul Fattin Diana, Nur Hidayati Othman, Munawar Zaman Shahruddin, Nur Hashimah Alias, Woe Jye Lau e Ahmad Fauzi Ismail. "Effect of graphene oxide (GO) and polyvinylpyrollidone (PVP) additives on the hydrophilicity of composite polyethersulfone (PES) membrane". Malaysian Journal of Fundamental and Applied Sciences 15, n.º 3 (25 de junho de 2019): 361–66. http://dx.doi.org/10.11113/mjfas.v15n3.1209.
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Membrane based separation system is considered as a promising technology to purify water, owing to its simplicity and efficiency in operation. However, the application is limited by membrane fouling, which can lead to the declination of water flux and premature failure of membrane. The fouling can be controlled through membrane surface modification by blending hydrophilic materials during the casting solution preparation. Polyethersulfone (PES) membrane is naturally hydrophobic due to lack of oxygen functional group, which limits its application in the filtration of water. Therefore, modification of PES-based membranes is required. In this work, modification of the PES membrane was carried out by incorporating carbon-based nanomaterials (graphene oxide (GO)) and a well-known organic polymer (polyvinylpyrrolidone (PVP)). The effect of each additive toward the hydrophilicity of composite PES membrane was then investigated. GO was synthesized using modified Hummers method due to its simpler and shorter process. Each additive was added during the casting solution preparation and the amount added was varied from 0.5 to 1.0 wt%. The resultant composite PES membranes were characterized using XRD, FTIR and TGA prior to hydrophilicity and pure water flux (PWF) measurement. It was observed that the additives (PVP and GO) have significantly affected the membranes hydrophilicity, resulting in lower contact angle and higher pure water flux. The highest value of PWF (230 L/m2.h) with lowest contact angle (42 °) were observed for PES-1.0GOPVP membrane due to high amount of GO and PVP. Improved PWF performance of composite PES-1.0GOPVP membrane was attributed to the better dispersibility of the PVP and GO and increased surface hydrophilicity of the modified composite membranes. This study indicated that PVP and GO are effective modifiers to enhance the performance of PES membrane
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Pasaoglu, Mehmet Emin, Serkan Guclu e Ismail Koyuncu. "Polyethersulfone/polyacrylonitrile blended ultrafiltration membranes: preparation, morphology and filtration properties". Water Science and Technology 74, n.º 3 (4 de junho de 2016): 738–48. http://dx.doi.org/10.2166/wst.2016.252.
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Polyethersulfone (PES)/polyacrylonitrile (PAN) membranes have been paid attention among membrane research subjects. However, very few studies are included in the literature. In our study, asymmetric ultrafiltration (UF) membranes were prepared from blends of PES/PAN with phase inversion method using water as coagulation bath. Polyvinylpyrrolidone (PVP) with Mw of 10,000 Da was used as pore former agent. N,N-dimethylformamide was used as solvent. The effects of different percentage of PVP and PES/PAN composition on morphology and water filtration properties were investigated. Membrane performances were examined using pure water and lake water filtration studies. Performances of pure water were less with the addition of PAN into the PES polymer casting solutions. However, long-term water filtration tests showed that PES/PAN blend membranes anti-fouling properties were much higher than the neat PES membranes. The contact angles of PES/PAN membranes were lower than neat PES membranes because of PAN addition in PES polymer casting solutions. Furthermore, it was found that PES/PAN blend UF membranes' dynamic mechanical analysis properties in terms of Young's modules were less than neat PES membrane because of decreasing amount of PES polymer.
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Dang, Jingchuan, Yatao Zhang, Zhan Du, Haoqin Zhang e Jindun Liu. "Antibacterial properties of PES/CuCl2 three-bore hollow fiber UF membrane". Water Science and Technology 66, n.º 4 (1 de agosto de 2012): 799–803. http://dx.doi.org/10.2166/wst.2012.238.
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In this study, a three-bore polyethersulfone (PES) hollow fiber ultrafiltration (UF) membrane with antibacterial properties was prepared by phase inversion, using PES as the membrane material, N,N-dimethylacetamide (DMAC) as solvent, polyvinylpyrrolidone (PVP) and CuCl2 as additives. The effect of CuCl2 content on the water flux and rejection was studied and the antibacterial properties of PES hollow fiber UF membrane were also investigated. The water flux results indicated that the hydrophilic properties of PES UF membranes were improved after adding CuCl2. The rejection of PVA-50000 was expected to drop slightly but remain high above 96%. The membranes showed good antibacterial activity against Escherichia coli (E. coli) after adding CuCl2 and the antibacterial rate of PES/CuCl2 UF membranes was close to 100% after running for 48 h. PES hollow fiber UF membranes with antibacterial properties were prepared through the formation of the water-soluble PVP/Cu2+ complex with spatial network structure, which have good antibacterial and hydrophilic properties. Therefore, this study could provide an effective method for membrane antifouling.
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Han, Mei, Qiang Liu, Baihai Su, Shudong Sun e Changsheng Zhao. "Bioinspired Polyethersulfone Membrane Design via Blending with Functional Polyurethane". International Journal of Polymer Science 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/2158124.
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Polyurethanes (PUs) are currently considered to be biocompatible materials but limited by a low resistance to thrombus. We therefore design a heparin-like PU (HLPU) to modify polyethersulfone (PES) membranes approaching integrated antifouling and antithrombotic properties by bioinspiration of heparin structure. Poly(vinyl pyrrolidone)-HLPU (PVP-HLPU) was synthesized via reversible addition-fragmentation chain transfer polymerization of VP using PU as a macroinitiator and then sulfonated by concentrated H2SO4. FTIR and NMR results demonstrated the successful synthesis of PVP-HLPU. By incorporation of PVP-HLPU, the cross-sectional structure of PES composite membranes altered from finger-like structure to sponge-like structure resulting in tunable permeability. The increased hydrophilicity verified by water contact angles benefited both the permeability and antifouling property. As a consequence, the composite membranes showed good blood compatibility, including decreased protein adsorption, suppressed platelet adhesion, lowered thrombin-antithrombin III generation, reduced complement activation, and prolonged clotting times. Interestingly, the PVP-capped HLPU showed better blood compatibility compared to polyethyleneglycol-capped and citric acid-capped HLPUs. The results demonstrated the enhanced antifouling and antithrombotic properties of PES hemodialysis membranes by the introduction of functional HLPUs. Also, the proposed method may forward the fabrication of hemocompatible membranes via bioinspired surface design.
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Gryta, Marek, e Piotr Woźniak. "The Resistance of Polyethersulfone Membranes on the Alkaline Cleaning Solutions". Membranes 14, n.º 2 (23 de janeiro de 2024): 27. http://dx.doi.org/10.3390/membranes14020027.
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Polyethersulfone (PES) is a polymer popularly used to produce ultrafiltration (UF) membranes. PES is relatively hydrophobic; thus, hydrophilic ingredients are added to the membrane matrix to reduce the fouling intensity. Ingredients such as polyvinylpyrrolidone (PVP) reduce the resistance of PES to NaOH solutions. This study investigated the possibility of using PES membranes for the separation of alkaline cleaning solutions. For this purpose, self-made PES membranes and commercial ultrafiltration PES membranes (UE10—10 kDa and UE50—100 kDa) containing PVP additive were used. The membranes were soaked for 18 months in alkaline (pH = 11.3–11.5) solutions of car washing fluids. It has been found that long-term contact with these solutions caused changes in the structure of the surface layer, especially of membranes containing PVP. As a result, the separation of dextran (100–200 kDa) decreased by 30–40% for PES membranes, 30–40% for UE10 and 40–60% for UE50. Despite these changes, the separation efficiency (rejection of COD, NTU and anionic surfactants) of synthetic car wash wastewater (mixture of surfactants and hydrowax) was similar to the results obtained for pristine membranes.
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Abdullah, Mohd Amirul Mukmin, Nur Aisyah Shafie, Mazrul Nizam Abu Seman e Syamsul B. Abdullah. "Performance Evaluation of Forward Osmosis Membranes for Desalination Applications". Chiang Mai Journal of Science 51, n.º 2 (29 de março de 2024): 1–14. http://dx.doi.org/10.12982/cmjs.2024.026.
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Forward osmosis (FO) has become a technology with great potential for numerous applications, including water desalination. One of the critical factors in determining the FO performance is the selection of the appropriate membrane material that compatible with draw solution. In this study, commercial cellulose triacetate (CTA) and aquaporin-based membranes, as well as a fabricated PES/PVP membrane, were used, with 1-Butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) as the thermo-responsive ionic liquid (TRIL) draw solution. The bench scale of FO system was setup upon co-currently flow rate of 60.0 mL/ min at room temperature. The 7 % PVP with 15 % PES had the best performance, with the highest water flux (Jw) (4.93 LMH), lowest reverse solute diffusion (RSD) (0.43 gMH). The fabricated membrane demonstrated a significantly higher performance compared to the commercial aquaporin-based FO membrane, with an improvement of approximately 60%.
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Chen, Yifeng, Jingchuan Dang, Yatao Zhang, Haoqin Zhang e Jindun Liu. "Preparation and antibacterial property of PES/AgNO3 three-bore hollow fiber ultrafiltration membranes". Water Science and Technology 67, n.º 7 (1 de abril de 2013): 1519–24. http://dx.doi.org/10.2166/wst.2013.023.
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In this study, a three-bore polyethersulfone (PES) hollow fiber ultrafiltration (UF) membrane with antibacterial properties was prepared by phase inversion, using PES as the membrane material, N,N-dimethylacetamide (DMAC) as solvent, polyvinylpyrrolidone (PVP) and AgNO3 as additives. The silver particles were detected by X-ray photoelectron spectroscopy. The effect of AgNO3 content on the antibacterial properties and separation performance was studied in detail. The membranes showed good antibacterial activity against Escherichia coli after adding AgNO3 and the antibacterial rate of PES/AgNO3 UF membrane with AgNO3 content of 1 wt% could reach 99.9% after running for 48 hours. Moreover, the bovine serum albumin solution filtration results indicated that the PES/AgNO3 membranes had a certain degree of antifouling performance. Therefore, three-bore PES/AgNO3 membranes have a potential application to reduce both bacterial and organic fouling in water treatment.
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Mohd Isa, Mohd Hafez, e Uswatun Hasanah Abdul Roni. "FABRICATION OF POLYETHERSULFONE – POLYITACONIC ACID (PES-PIA) MEMBRANE FOR REMOVAL OF REACTIVE RED 120". International Journal of Innovation and Industrial Revolution 5, n.º 14 (11 de setembro de 2023): 44–54. http://dx.doi.org/10.35631/ijirev.514003.
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The hazardous and mutagenic properties of dye effluents discharged into water bodies have led to the development of membrane separation for water treatment. pH-sensitive membranes have been widely employed as they exhibit remarkable improvements in the permeability and separation performance of polyethersulfone (PES) membranes. In this study, the PES membranes incorporated with polyvinylpyrrolidone (PVP), pluronic F108, and polyitaconic acid (PIA) by phase inversion were fabricated and characterized. PIA at different weight percentages were introduced into the PES dope solution via blending technique. The dye removal capacity, chemical composition, and thermal stability were characterized using UV-Vis spectrometer, fourier transform infrared (FTIR), and thermogravimetric analyzer (TGA) respectively. The fabricated membranes showed excellent rejection of reactive red 120 (RR120), which is an anionic dye. The study evaluated the membrane performance of pure water permeation (PWP) along with RR120 dye rejection. M20-PPI1, with a weight percentage of PVP/Pluronic F108/PIA; 3%/1.5%/0.25%, exhibited the highest water flux of 12 L/m2h and dye rejection of 82% at pH value of 2 for RR120 dye rejection. The findings propose that M20-PPI1 is an effective pH-sensitive membrane for dye rejection.
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Zhao, Huyang, Ting He, Shuang Yao, Long Tao, Xinhai Zhang, Zhaohui Wang, Zhaoliang Cui e Rizhi Chen. "Improved Protein Removal Performance of PES Hollow-Fiber Ultrafiltration Membrane with Sponge-like Structure". Polymers 16, n.º 9 (25 de abril de 2024): 1194. http://dx.doi.org/10.3390/polym16091194.
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The research used polyethersulfone (PES) as a membrane material, polyvinylpyrrolidone (PVP) k30 and polyethylene glycol 400 (PEG 400) as water-soluble additives, and dimethylacetamide (DMAc) as a solvent to prepare hollow-fiber ultrafiltration membranes through a nonsolvent-induced phase separation (NIPS) process. The hydrophilic nature of PVP-k30 and PEG caused them to accumulate on the membrane surface during phase separation. The morphology, chemical composition, surface charge, and pore size of the PES membranes were evaluated by SEM, FTIR, zeta potential, and dextran filtration experiments. The paper also investigated how different spinning solution compositions affected membrane morphology and performance. The separation efficiency of membranes with four different morphologies was tested in single-protein and double-protein mixed solutions. The protein separation effectiveness of the membrane was studied through molecular weight cutoff, zeta potential, and static protein adsorption tests. In addition, the operating pressure and pH value were adjusted to improve ultrafiltration process conditions. The PES membrane with an intact sponge-like structure showed the highest separation factor of 11, making it a prime candidate membrane for the separation of bovine serum albumin (BSA) and lysozyme (LYS). The membrane had a minimal static protein adsorption capacity of 48 mg/cm2 and had excellent anti-fouling properties. When pH = 4, the BSA retention rate was 93% and the LYS retention rate was 23%. Furthermore, it exhibited excellent stability over a pH range of 1–13, confirming its suitability for protein separation applications.
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Arahman, Nasrul, Bastian Arifin e Fachrul Razi. "Profil Permeabilitas Berdasarkan Struktur Morfologi Membran Polietersulfon pada Pemekatan Larutan Tokoferol (Permeability Profile based on Morphology Structure of Polyethersulfone Membrane on Concentrating the Tocopherol Solution)". Agritech 36, n.º 4 (25 de fevereiro de 2017): 416. http://dx.doi.org/10.22146/agritech.16765.
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Separation technique by membrane technology has been widely applied for separation and purification of minor components from vegetable oil. Membrane was prepared and modified in several way in order to improve the filtration performance in purification process of vegetable oil. In this work, the filtration performance of three types of polyethersulfone hollow fiber membrane was investigated. The main objective of this research was to study the effect of membranes type on the filtration performance of tocopherol solution. Three series of filtration experiment were conducted by using fabricated membrane by dissolving of polyethersulfone (PES) in N-methyl pyrrolydone (NMP) with different polymer composition. The membranes was M1 = PES 20 % + NMP, M2 = PES 18 % + NMP, and M3= PES 20 %+ Polyvinyl pyrrolidone (PVP 5 %) + NMP. The difference structure of membrans was confirmed by scanning electron microscopy measurement. The permeability profile of tocopherol solution of 500 ppm was observed by using a single module of hollow fiber membrane with filtration flow of pressure driven inside (PDI). It is shown that, the permeability of tocopherol solution was maximum and stable using PES membrane was composed by M3 system. Moreover, the improvement of tocopherol concentration in retentate solution was about two times higher than that the original solution that was obtained from filtration system of M1 membrane.ABSTRAKTeknik separasi dengan membran teknologi telah diaplikasikan secara luas untuk pemisahan dan pemurnian komponen minor dari minyak tumbuh-tumbuhan. Membran telah dibuat dan dimodifikasikan dengan berbagai cara untuk meningkatkan kinerja filtrasi pada proses pemurnian minyak tumbuh-tumbuhan. Pada penelitian ini, dipelajari kinerja filtrasi tiga jenis membran hollow fiber yang terbuat dari polimer polietersulfon. Tujuan utama penelitian adalah untuk melihat pengaruh jenis membran terhadap kinerja filtrasi larutan tokoferol. Tiga seri penelitian ultrafiltrasi telah dirancang dengan menggunakan membran yang dibuat dengan melarutkan polietersulfon (PES) dalam N-metil pirolidon (NMP) dengan komposisi polimer yang berbeda. Ketiga jenis membran yang digunakan adalah M1 = PES 20 % + NMP, M2 = PES 18 % + NMP, dan M3 = PES 20 % + Polivinil pirolidon (PVP 5 %) + NMP. Perbedaan struktur morfologi membran telah dikonfirmasikan dengan analisis scanning electron microscopy. Profil permeabilitas larutan tokoferol 500 ppm diobservasi menggunakan modul tunggal membran hollow fiber dengan tipe aliran pressure driven inside (PDI). Hasil penelitian menunjukkan bahwa permeabilitas larutan tokoferol tertinggi dihasilkan dengan menggunakan membran M3. Lebih lanjut, peningkatan konsentrasi larutan tokoferol sekitar dua kali lebih tinggi dari konsentrasi awal dicapai dari proses filtrasi dengan membran M1.
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Abdullah, Asyrine, Prakash Peechmani, Mohd Hafiz Dzarfan Othman, Mohd Hafiz Puteh, Juhana Jaafar, Muklis A. Rahman e Ahmad Fauzi Ismail. "Removal of Organic Dye in Wastewater Using Polyethersulfone Hollow Fiber Membrane". Journal of Applied Membrane Science & Technology 26, n.º 2 (25 de julho de 2022): 29–42. http://dx.doi.org/10.11113/amst.v26n2.238.
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In this study, polyethersulfone (PES) hollow fiber membranes (HFM) were fabricated with different weight percentage (wt. %) of polymer at 16 wt. %, 18 wt. % and 20 wt. %, in order to study the impact of polymer weight percentages on membrane properties and its dye rejection performance. Microfiltration HFM were fabricated by using the laboratory dry-wet spinning method. In order to improve the pore structure of the polymer membrane, 3 wt. % of (PVP) of 8000 M.W. was added in the dope solution. All the fabricated PES hollow fiber membranes were characterized using the Scanning Electron Microscopy (SEM), Atomic Force Microscope (AFM), Fourier Transform Infrared Spectroscopy (FTIR) and the contact angle. The HFM’s performance was evaluated in terms of dye rejection, by using Direct Red 80 dye as substitute of organic dye in wastewater. The results ed that the membrane with higher weight percentage of PES polymer (20 % PES) had thicker separation layer, smoother membrane surface and uniform like pore structures. The membrane with the higher weight percentage of polymer (20% PES) had higher dye rejection percentage (67.33%) and higher permeate flux (10.024 L/m2h) compared to 16 wt. % and 18 wt. %. The results of this study revealed that the weight percentage of polymer in the membrane did affect the membrane properties and its performance.
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Gzara, Lassaad, Zulfiqar Ahmad Rehan, Silvia Simone, Francesco Galiano, Naser Tavajohi Hassankiadeh, Sharaf Faisal Al-Sharif, Alberto Figoli e Enrico Drioli. "Tailoring PES membrane morphology and properties via selected preparation parameters". Journal of Polymer Engineering 37, n.º 1 (1 de janeiro de 2017): 69–81. http://dx.doi.org/10.1515/polyeng-2015-0419.
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Abstract Polyethersulfone (PES) is among the most interesting materials for membranes preparation, thanks to its outstanding properties, coupled to compatibility with several additives and the facility to be solubilized in several solvents. In this work, flat sheet membranes were prepared by the non-solvent induced phase separation (NIPS) technique, using PES as polymer and polyvinyl pyrrolidone (PVP, 10 kDa) as additive. Preparation and casting conditions were varied and membranes with tailored morphology and properties were obtained. The main objective was to investigate the relationship between selected preparation conditions and membrane features. This may help to understand how to tailor membrane morphology and properties depending on the desired application.
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Gryta, Marek, Piotr Woźniak e Sylwia Mozia. "Effects of Alkaline Cleaning Agents on the Long-Term Performance and Aging of Polyethersulfone Ultrafiltration Membranes Applied for Treatment of Car Wash Wastewater". Membranes 14, n.º 6 (24 de maio de 2024): 122. http://dx.doi.org/10.3390/membranes14060122.
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The commercial ultrafiltration polyethersulfone (PES) membranes (10 and 100 kDa) blended with polyvinylpyrrolidone (PVP) were applied for the filtration of car wash wastewater. Periodical membrane rinsing with water did not prevent fouling and a decrease in permeate flux was observed. Fouling was reduced by washing the membranes with cleaning agents, which are used in car washes to clean wheels and remove insects. In addition to surfactants, these agents contain NaOH, hence the pH value of cleaning solutions was over 11. Long-term contact with such solutions resulted in the removal of PVP from the membrane matrix and an increase in pore size. The PES membranes were soaked in an alkaline solution (pH = 11.5) for 20 months, after which the 200 kDa dextran rejection decreased from 95% to 80%. To compare with the static degradation conditions, 8 weeks of alkaline agent filtration was realized, after which the dextran (200 kDa) rejection decreased below 50%. This indicated that the cross-flow of alkaline agents can accelerate the removal of components building the membrane matrix. Despite membrane degradation, the separation efficiency (the rejection of chemical oxygen demand—COD, turbidity, and surfactants) during the treatment of synthetic car wash wastewater was similar to that obtained for pristine membranes.
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Pellegrin, B., E. Gaudichet-Maurin e C. Causserand. "Mechano-chemical ageing of PES/PVP ultrafiltration membranes used in drinking water production". Water Supply 13, n.º 2 (1 de março de 2013): 541–51. http://dx.doi.org/10.2166/ws.2013.056.
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In water treatment by microfiltration and ultrafiltration, a major concern is the integrity loss or failure of membrane induced by onsite operations, potentially leading to permeate water contamination. This study aims to provide a better understanding of the phenomena responsible for membrane damage by analyzing its causes and effects. The role of sodium hypochlorite exposure conditions and the impact of mechanical stress on membrane characteristics were investigated. Monitoring of hydraulic response, mechanical properties and the evolution of the chemical structure showed, on multiple scales, strong indications of membrane chemical degradation, involving radical mechanisms, accelerated by tensile stress application.
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Russo, Francesca, Maria Bulzomì, Emanuele Di Nicolò, Claudia Ursino e Alberto Figoli. "Enhanced Anti-Fouling Behavior and Performance of PES Membrane by UV Treatment". Processes 9, n.º 2 (28 de janeiro de 2021): 246. http://dx.doi.org/10.3390/pr9020246.
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An easy method to prepare hydrophilic PES membranes with anti-fouling properties was developed by UV-polymerization of poly vinyl pirrolidone (PVP) on membrane surfaces. The modified membrane surfaces were analyzed by ATR-FTIR, and the new hydrophilic nature of the membranes was determined by contact angle measurements. The novel membranes were prepared using Rhodiasolv® Polarclean as a green solvent and compared with a control PES membrane, without the exposure at the hydrophilization procedure. The influences of the UV lamp distance (15 and 30 cm) and the exposure time (0 cm to 60 cm) were evaluated. All membranes were characterized in terms of surface morphology, porosity, pore size, and pure water permeability (PWP). The treated membranes resulted in an increase in hydrophilicity and in improved performances in terms of PWP and foulant rejection. In particular, an anti-fouling test was performed using a solution of 100 mg/L of humic acid (HA) as a model foulant. The UV-treated membrane efficiency, compared with a commercial PES membrane, showed a recovery of about 97%, confirming that these membranes can be applied in wastewater treatment.
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Causserand, Christel, Bastien Pellegrin e Jean-Christophe Rouch. "Effects of sodium hypochlorite exposure mode on PES/PVP ultrafiltration membrane degradation". Water Research 85 (novembro de 2015): 316–26. http://dx.doi.org/10.1016/j.watres.2015.08.028.
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Zhang, Yu Zhong, Ru Jia e Hong Li. "Preparation and Characterization of Ion Exchange Resin Mixed Polyethersulfone Hybrid Membranes". Advanced Materials Research 79-82 (agosto de 2009): 1359–62. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1359.
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Ion exchange resin (IER) mixed polyethersulfone (PES) hybrid membranes were prepared by a phase inversion method, using polyethyleneglycol-400 (PEG-400) and polyvinyl pyrrolidone (PVP) as additives. Two different types of resin, D201 and D061, were incorporated into polyethersulfone dope solution separately with intention of producing highly permeable and hydrophilic membranes. The effect of filler on morphology, pure water permeation, and rejection of bovine serum albumin (BSA) was investigated. It was found that the morphology of hybrid membranes showed a typical asymmetry structure. The amount of IER, the concentration of additives and the temperature of coagulation bath showed to be powerful factors to influence the pore size and pure water flux. Membranes prepared from a solution containing PES concentrations from 13wt% to 15wt%, the pure water flux decreased from 244.6 to 97.5 L/(m2•h). And PVP could serve as an additive to render the hybrid membrane hydrophilic. High values of BSA rejection capacity were performed by the resin mixed polyethersulfone hybrid membranes.
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Irfan, Muhammad, Masooma Irfan, Ani Idris, Abdullah Saad Alsubaie, Khaled H. Mahmoud, Noordin Mohd Yusof e Naeem Akhtar. "Dual Optimized Sulfonated Polyethersulfone and Functionalized Multiwall Carbon Tube Based Composites High Fouling Resistance Membrane for Protein Separation". Membranes 12, n.º 3 (16 de março de 2022): 329. http://dx.doi.org/10.3390/membranes12030329.
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Commercial grade sulfonated-Polyethersulfone (S-PES) and functionalized multiwall carbon nanotube (f-MWCNT)/polyvinylpyrrolidone (PVP) nanocomposites (NCs) were used to enhance and optimize the antifouling, protein resistance and protein separation properties of the S-PES ultrafiltration membranes. The polarities of sulfonic groups of S-PES, carbonyl carbon of pyrrolidone, hydroxyl and carboxyl groups of f-MWCNT in the membrane composition helped to strongly bind each other through hydrogen bonding, as shown by Fourier-transform infrared spectroscopy (FTIR). These binding forces greatly reduced the leaching of NCs and developed long finger-like projection, as confirmed by elution ratio and cross-sectional studies of the membranes via field emission scanning electron microscope (FESEM). The contact angle was reduced up to 48% more than pristine PES. Atomic force microscopy (AFM) was employed to study the various parameters of surface roughness with 3d diagrams, while grain analysis of membrane surface provided a quantitative estimation about volume, area, perimeter, length, radius and diameter. The NCs/S-PES enhanced the flux rate with an impressive (80–84%) flux recovery ratio and (58–62%) reversible resistance (Rr) value in situ, with 60% and 54.4% lesser dynamic and static protein adsorption. The best performing membrane were reported to remove 31.8%, 66.3%, 83.6% and 99.9% for lysozyme-(14.6 kDa), trypsin-(20 kDa), pepsin-(34.6 kDa) and bovine serum albumin (BSA-66 kDa), respectively.
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Batool, Mehwish, Amir Shafeeq, Bilal Haider e Nasir M. Ahmad. "TiO2 Nanoparticle Filler-Based Mixed-Matrix PES/CA Nanofiltration Membranes for Enhanced Desalination". Membranes 11, n.º 6 (9 de junho de 2021): 433. http://dx.doi.org/10.3390/membranes11060433.
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Mixed-matrix nanocomposite (PES/CA/PVP) membranes were fabricated for water desalination by incorporating varying amount of titanium dioxide nanoparticles (TiO2 NPs) ranging from 0 and 2 wt. %. Efficient dispersion of nanoparticles within polymeric membranes was achieved using the chemical precipitation method for uniform surface generation, and an asymmetric morphology was achieved via phase inversion method. Finally, membranes were characterized by Fourier Transform Infrared (FTIR) spectroscopy, Thermo Gravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), porosity and contact angle analysis. FTIR confirmed chemical composition of membranes in terms of polymers (PES/CA/PVP) and TiO2. TGA analysis confirmed an increase in thermal stability of membranes with the increase of TiO2 nanoparticles loading. The addition of TiO2 nanoparticles also resulted in an increase in porous structures due to an increase in mean pore size, as shown by SEM results. An increase in the hydrophilicity of the membranes was observed by increasing the concentration of TiO2 nanoparticles. The present study investigated pristine and mixed-matrix nanocomposite NF membrane performance while filtering a NaCl salt solution at varying concentration range (from 1 to 4 g/Lit 6 bar). The prepared membranes demonstrated significant improvement in water permeability and hydrophilicity. Further, to optimize the water flux and salt rejection, the concentration of Polyvinylpyrrolidone (PVP) was optimized along with TiO2 nanoparticles. Both the water flux and salt rejection of the fabricated membranes were observed to increase with an increase inTiO2 nanoparticles to 2 wt. % loading with optimized PVP concentration, which demonstrated the improved desalination performance of resultant membranes.
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Song, Guocheng, Jing Li, Junrong Yu, Yan Wang, Jing Zhu e Zuming Hu. "High Performance Microfiltration Composite Membranes Based on Phenolphthalein Poly(ether sulfone) Nanofibrous Substrate with Hydrophilic Coating". Journal of Nanoscience and Nanotechnology 19, n.º 6 (1 de junho de 2019): 3495–504. http://dx.doi.org/10.1166/jnn.2019.16035.
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In the present paper, Phenolphthalein poly(ether sulfone) (PES-C) nanofibrous membranes were prepared via solution-blowing technology and polyvinylpyrrolidone (PVP) which would be converted to stable gels by reaction with potassium persulfate (K2S2O8) was immobilized on the surface of nanofibers. The influence factors such as PVP concentration and depositing time were optimized to obtain the composite nanofibrous membranes. The membranes were characterized by Scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Wide-angle X-ray diffraction (WAXD), X-ray photoelectron spectroscopy (XPS) and Water contact angles (WCA), etc. The hydrophilicity of the composite membrane was significantly enhanced by immobilizing Polyvinylpolypyrrolidone (PVPP) on the surface of nanofibers. Furthermore the filtration experiment of starch suspension and oil-water separation test were executed and the anti-fouling properties of the modified membranes were evaluated with the flux recovery ratio (FRR%). The results showed that membranes with PVPP-modified had a more excellent and stability antifouling performances compared with the original membranes. Generally, this work provides a simple and useful method to improve anti-fouling properties of PES-C nanofibrous membranes which had great potential application in microfiltration.
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Omidvar, Maryam, Zahra Hejri e Ahmad Moarefian. "The effect of Merpol surfactant on the morphology and performance of PES/PVP membranes: antibiotic separation". International Journal of Industrial Chemistry 10, n.º 4 (25 de julho de 2019): 301–9. http://dx.doi.org/10.1007/s40090-019-0192-5.
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Abstract The present study used modified nanofiltration (NF) membranes to remove the emerging contaminant of amoxicillin (AMX) from synthetic wastewater. For this purpose, Merpol surfactant and polyvinylpyrrolidone were added to the casting solutions to prepare flat sheet asymmetric polyethersulfone (PES) NF membranes through phase inversion process. Then, the effect of adding Merpol surfactant at different concentrations on the morphology, hydrophilicity, and pure water flux (PWF) of the membranes, as well as the separation of AMX from aqueous solutions was investigated. The characteristics of the prepared membranes were studied by scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), contact angle (CA) measurement and performance tests. The obtained results approved the improved hydrophilicity of the PES membranes after adding Merpol surfactant to the casting solution. The findings also revealed a gradual increase in the average size of the membrane pores in sub-layer and thinner top layer, proportional to the increase of surfactant content in the solution. The results also confirmed the increase of PWF under the influence of surfactant increase. As a result, for the membrane containing 8 wt% Merpol additive, the lowest CA (52.08°), the highest PWF (76.31 L/m2 h), and maximum AMX excretion (97%) were achieved.
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Nasrul Arahman, Sri Aprilia e Teuku Maimun. "STUDI SOLIDIFIKASI POLIETERSULFON DALAM PELARUT N-METIL-2-PIRROLIDON DENGAN ADITIV POLYVINYL PYRROLIDONE DAN 2-(METHACRYLOYLOXY) ETHYL PHOSPHORYL CHLOLINE". Jurnal Teknik Kimia USU 3, n.º 3 (30 de setembro de 2014): 18–23. http://dx.doi.org/10.32734/jtk.v3i3.1630.
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In membrane preparation process via phase inversion method, the morphology of fabricated membranes are determined by composition and concentration of polymer, solvent, and non-solvent. The basic knowledge of the appropriate composition of those components are needed by cloud point experiment. In this work, the study on cloud point experiment have been done to investigate the solidification process of polymer system of polyethersulfone (PES) and 2-(methacryloyloxy) ethyl phosphoryl chloline (MPC) in N-methyl-2-pirrolidon (NMP) via phase inversion technique. Hydrofilik polymer MPC were used as a membrane modifying agent (MMA) in order to modify the surface property of fabricated membrane. In sum, addition of PVP and MPC into polymer solution brought about reducing amount of non-solvent necessary to obtain the cloud point of solution.
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Wang, Cunshi, Ting Fu, Qiuzi Zhu, Ruihong Yang, Yanyan Cao e Jianzhong Zhu. "A novel polyethersulfone/modified activated carbon fiber composite membrane: potential for removal micropollutants from water under the electric field". Water Science and Technology 82, n.º 11 (8 de outubro de 2020): 2234–49. http://dx.doi.org/10.2166/wst.2020.488.
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Abstract This study aimed to develop a novel composite membrane based on polyethersulfone (PES) and modified activated carbon fibers (ACFs) to remove of sulfamethoxazole (SMZ) from water. The modification of ACFs was conducted by using acid, Fe, and Mn and was confirmed by Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray spectroscopy (EDS), and water contact angle measurement. Later on, the composite membranes were prepared using PES (9 wt%), N-N-dimethylacetamide (DMAc) (75 wt%), polyethylene pyrrolidone (PVP) (5 wt%), anhydrous lithium chloride (LiCl) (1 wt%), and various types of modified ACFs (0.8 wt%) as additives. It was found that the contact angle of the membrane decreased by more than 20°, and the zeta potential decreased by more than 10 mV. ACF modified by Fe was used as an admixture, membrane obtained the high comprehensive performance. Especially bovine serum albumin (BSA) rejection rate and flux recovery ratio (FRR) reached 98.8% and 98.4%, respectively. And the removal rates of SMZ increased by 24.6% under the electric field. The degradation products were detected by high-performance liquid chromatography/mass spectrometry (HPLC/MS). Based on this result, the possible degradation pathways of SMZ are proposed.
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Vatsha, Banele, Jane Catherine Ngila e Richard M. Moutloali. "Preparation of antifouling polyvinylpyrrolidone (PVP 40K) modified polyethersulfone (PES) ultrafiltration (UF) membrane for water purification". Physics and Chemistry of the Earth, Parts A/B/C 67-69 (2014): 125–31. http://dx.doi.org/10.1016/j.pce.2013.09.021.
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Ahmad, Abdul Latif, Wen Yu Pang, Zulfida Mohamad Hafis Mohd Shafie e Nur Dina Zaulkiflee. "PES/PVP/TiO2 mixed matrix hollow fiber membrane with antifouling properties for humic acid removal". Journal of Water Process Engineering 31 (outubro de 2019): 100827. http://dx.doi.org/10.1016/j.jwpe.2019.100827.
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Acarer, Seren, İnci Pir, Mertol Tüfekci, Güler Türkoğlu Demirkol e Neşe Tüfekci. "Manufacturing and Characterisation of Polymeric Membranes for Water Treatment and Numerical Investigation of Mechanics of Nanocomposite Membranes". Polymers 13, n.º 10 (20 de maio de 2021): 1661. http://dx.doi.org/10.3390/polym13101661.
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In this study, polyethersulfone (PES) and polyvinylidene fluoride (PVDF) microfiltration membranes containing polyvinylpyrrolidone (PVP) with and without support layers of 130 and 150 μm thickness are manufactured using the phase inversion method and then experimentally characterised. For the characterisation of membranes, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and pore size analysis are performed, the contact angle and water content of membranes are measured and the tensile test is applied to membranes without support layers. Using the results obtained from the tensile tests, the mechanical properties of the halloysite nanotube (HNT) and nano-silicon dioxide (nano SiO2) reinforced nanocomposite membranes are approximately determined by the Mori–Tanaka homogenisation method without applying any further mechanical tests. Then, plain polymeric and PES and PVDF based nanocomposite membranes are modelled using the finite element method to determine the effect of the geometry of the membrane on the mechanical behaviour for fifteen different geometries. The modelled membranes compared in terms of three different criteria: equivalent stress (von Mises), displacement, and in-plane principal strain. Based on the data obtained from the characterisation part of the study and the numerical analysis, the membrane with the best performance is determined. The most appropriate shape and material for a membrane for water treatment is specified as a 1% HNT doped PVDF based elliptical membrane.
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Lee, Gyeong Tae, e Young Ki Hong. "Manufacturing and Separation Characteristics of Hemodialysis Membranes to Improve Toxin Removal Rate". Advances in Polymer Technology 2022 (27 de março de 2022): 1–18. http://dx.doi.org/10.1155/2022/2565010.
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With the recently growing interest in health care, hemodialysis is being performed not only to treat patients with renal disease but also to improve blood circulation. At present, filters used for hemodialysis are manufactured only in certain countries, and all other countries must rely on imports. In this study, polyethersulfone (PES), which has excellent blood compatibility, was used as the main material to develop hemodialysis membranes for hemodialysis filters, and these hemodialysis membranes were prepared by adding a hydrophilic polymer, polyvinylpyrrolidone (PVP), and varying the type of nonsolvent during the manufacturing process to improve the toxin removal rate and biocompatibility. The addition of PVP was confirmed through attenuated total reflection Fourier transform infrared (ATR-FTIR), and the structure of the membranes depending on the nonsolvent was analyzed through scanning electron microscopy (SEM) and atomic force microscopy (AFM) images. The contact angle results indicated that the hydrophilicity of the membrane surface was improved as the concentration of PVP increased. The results of the toxin filtration efficiency experiment using urea, creatinine, and bovine serum albumin (BSA) confirmed removal rates of 58.8% and 56.87%, respectively, and a protein loss of less than 8%. Also, cell viability was over 90% at the PVP concentration of 2% or higher. A preliminary study was conducted on the improvement of toxin filtration efficiency and the development potential of these hemodialysis membranes with excellent biocompatibility.
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Milescu, Roxana A., C. Robert McElroy, Thomas J. Farmer, Paul M. Williams, Matthew J. Walters e James H. Clark. "Fabrication of PES/PVP Water Filtration Membranes Using Cyrene®, a Safer Bio-Based Polar Aprotic Solvent". Advances in Polymer Technology 2019 (7 de julho de 2019): 1–15. http://dx.doi.org/10.1155/2019/9692859.
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A more sustainable dialysis and water filtration membrane has been developed, by using the new, safer, bio-based solvent Cyrene® in place of N-methyl pyrrolidinone (NMP). The effects of solvent choice, solvent evaporation time, the temperature of casting gel, and coagulation bath together with the additive concentration on porosity and pore size distribution were studied. The results, combined with infrared spectra, SEM images, porosity results, water contact angle (WCA), and water permeation, confirm that Cyrene® is better media to produce polyethersulfone (PES) membranes. New methods, Mercury Intrusion Porosimetry (MIP) and NMR-based pore structure model, were applied to estimate the porosity and pore size distribution of the new membranes produced for the first time with Cyrene® and PVP as additive. Hansen Solubility Parameters in Practice (HSPiP) was used to predict polymer-solvent interactions. The use of Cyrene® resulted in reduced polyvinylpyrrolidone (PVP) loading than required when using NMP and gave materials with larger pores and overall porosity. Two different conditions of casting gel were applied in this study: a hot (70°C) and cold gel (17°C) were cast to obtain membranes with different morphologies and water filtration behaviours.
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Basri, H., A. F. Ismail e M. Aziz. "Polyethersulfone (PES)–silver composite UF membrane: Effect of silver loading and PVP molecular weight on membrane morphology and antibacterial activity". Desalination 273, n.º 1 (junho de 2011): 72–80. http://dx.doi.org/10.1016/j.desal.2010.11.010.
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Medeiros, Vanessa da Nóbrega, Bárbara Ianny Arruda Silva, Rodholfo da Silva Barbosa Ferreira, Sandriely Sonaly Lima Oliveira, Rafael Agra Dias e Edcleide Maria Araújo. "Optimization of Process Parameters for Obtaining Polyethersulfone/Additives Membranes". Water 12, n.º 8 (3 de agosto de 2020): 2180. http://dx.doi.org/10.3390/w12082180.
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The membrane separation process has been significantly highlighted for the treatment of water and effluents in a scenario of water resource scarcity. Effective treatments capable of reducing costs and waste are always necessary, with the planning of the experiments before their execution of interest. The purpose of this work was to evaluate, through experimental planning, the influence of the polyethersulfone (PES), polyvinylpyrrolidone (PVP), and clay variables on the membranes’ parameters (viscosity and contact angle), seeking the best compositions for the production of hollow fiber membranes. Membranes were produced according to the compositions proposed by the planning and were characterized by Viscosity, Contact Angle, X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and flow measurements. Through XRD, it was shown that the characteristic peaks of the clay remained in the membranes with higher concentrations. SEM analysis showed the influence of clay on the membranes’ porosity as well as the relation between “fingers” formation and PVP. From the flow measurement test, the relation between the obtained flow and the polymer and clay contents was verified. These tests showed the significant influence of clay on the membranes’ performance. Thus, the use of experimental planning resulted in the development of membranes and their importance in the design of future studies, making it possible to predict and simulate experiments.
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Esmaeili, M., S. S. Madaeni, J. Barzin e N. Yousefimehr. "Effect of silver ions coordination on morphology and performance of PES/PVP composite membrane in facilitated transport of ethylene". Separation and Purification Technology 81, n.º 3 (outubro de 2011): 371–83. http://dx.doi.org/10.1016/j.seppur.2011.08.004.
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Abdallah, Heba, Tarek S. Jamil, A. M. Shaban, Eman S. Mansor e Eglal R. Souaya. "Influence of the polyacrylonitrile proportion on the fabricated UF blend membranes’ performance for humic acid removal". Journal of Polymer Engineering 38, n.º 2 (23 de fevereiro de 2018): 129–36. http://dx.doi.org/10.1515/polyeng-2017-0003.
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Abstract Asymmetric blend membranes of polyethersulfone (PES)/polyacrylonitrile (PAN) were prepared and developed for ultrafiltration applications. The membranes were prepared by dissolving two polymers in N-methyl-2-pyrrolidone (NMP) as a solvent with diethylene glycol (DEG) and polyvinylpyrrolidone (PVP) as non-solvent and pore former, respectively. The produced membranes were characterized by scanning electron microscopy (SEM) and fourier transform infrared (FTIR) spectroscopy, and the hydrophilicity of membranes was tested by contact angle measurements. The performance of prepared membranes was carried out by an ultrafiltration testing unit, where the efficiency of membranes was determined according to the humic acid separation and treated water permeate flux. The results indicated that using 1 wt.% of PAN in polymer mixture provided a blending membrane with high mechanical properties and high performance; the humic acid rejection reached 92.47% with treated water permeate flux 70 l/m2·h at feed pressure 6 bar.
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Russo, Francesca, Claudia Ursino, Burcu Sayinli, Ismail Koyuncu, Francesco Galiano e Alberto Figoli. "Advancements in Sustainable PVDF Copolymer Membrane Preparation Using Rhodiasolv® PolarClean As an Alternative Eco-Friendly Solvent". Clean Technologies 3, n.º 4 (19 de outubro de 2021): 761–86. http://dx.doi.org/10.3390/cleantechnol3040045.
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In this work, Rhodiasolv® PolarClean was employed as a more sustainable solvent for the preparation of poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) flat sheet membranes via phase inversion technique by coupling vapour induced phase separation (VIPS) and non-solvent induced phase separation (NIPS) processes. Preliminary calculations based on Hansen solubility parameters well predicted the solubilization of the polymer in the selected solvent. The effect of exposure time on humidity and the influence of polyethylene glycol (PEG), polyvinyl pyrrolidone (PVP) and sulfonated polyether sulfone (S-PES) on membrane properties and performance, were evaluated. Three different coagulation bath compositions were also explored. The obtained membranes, prepared using a more sustainable approach, were compared with those produced with the traditional toxic solvent N-methyl-2-pyrrolidone (NMP) and characterised in terms of morphology, porosity, wettability, pore size, surface roughness and mechanical resistance. The potential influence of the new solvent on the crystallinity of PVDF-HFP-based membranes was also evaluated by infrared spectroscopy. The adjustment of the parameters investigated allowed tuning of the membrane pore size in the microfiltration (MF) and ultrafiltration (UF) range resulting in membranes with various morphologies. From the water permeability and rejection tests, performed with methylene blue dye, the prepared membranes showed their potentiality to be used in MF and UF applications.
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Fathanah, Umi, Mirna Rahmah Lubis, Zuhra Mahyuddin, Syawaliah Muchtar, Mukramah Yusuf, Cut Meurah Rosnelly, Sri Mulyati et al. "Sintesis, Karakterisasi dan Kinerja Membran Hidrofobik Menggunakan Polyvinyl Pyrrolidone (PVP) sebagai Aditif". ALCHEMY Jurnal Penelitian Kimia 17, n.º 2 (9 de setembro de 2021): 140. http://dx.doi.org/10.20961/alchemy.17.2.48435.140-150.
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<p id="docs-internal-guid-b49d22e2-7fff-5c84-7aed-4f9774e2137c" style="line-height: 1.2; margin-left: 0.35pt; margin-right: -0.1pt; text-align: justify; margin-top: 6pt; margin-bottom: 6pt;" dir="ltr"><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Artikel ini melaporkan tentang sintesis, karakterisasi dan kinerja membran </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: italic; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">polyethersulfone </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">(PES) yang dimodifikasi dengan aditif </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: italic; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">polyvinyl pyrrolidone</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> (PVP) dengan tujuan untuk meningkatkan kinerja dan sifat </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: italic; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">antifouling</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> membran. Membran PES modifikasi dibuat dengan penambahan 0,5% PVP sebagai aditif, menggunakan pelarut </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: italic; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">dimethyl sulfoxide</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> (DMSO) dan </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: italic; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">n-methyl pyrrolidone</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> (NMP). Pengaruh penambahan aditif dalam sistem membran dievaluasi dengan menganalisa perubahan struktur kimia menggunakan </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: italic; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">fourier transform infrared</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> (FTIR), perubahan morfologi permukaan menggunakan </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: italic; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">scanning electron microscopy </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">(SEM), uji kuat tarik menggunakan </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: italic; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">tensile strength meter</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">, uji porositas membran dengan menggunakan metode gravimetri, serta pengujian kinerja filtrasi, dan sifat </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: italic; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">antifouling</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">. Hasil analisa struktur membran dengan SEM menunjukkan adanya pengaruh jenis pelarut dan penambahan aditif terhadap perubahan morfologi membran. Selain itu modifikasi membran juga meningkatkan porositas, kinerja fluks permeasi serta sifat </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: italic; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">antifouling</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> membran. Hasil uji filtrasi membran menunjukkan perolehan permeabilitas air pada membran D-0,5 dan N-0,5 masing masing sebesar 47,5 L/m</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: 0.6em; vertical-align: super;">2</span></span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">.jam.atm dan 41,5 L/m</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: 0.6em; vertical-align: super;">2</span></span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">.jam.atm dengan sifat </span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: italic; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">antifouling</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> membran modifikasi lebih besar dibandingkan dengan membran tanpa modifikasi.</span></p><p style="line-height: 1.2; margin-left: 0.35pt; margin-right: -0.1pt; text-align: justify; margin-top: 6pt; margin-bottom: 6pt;" dir="ltr"> </p><p style="line-height: 1.2; margin-left: 0.35pt; margin-right: -0.1pt; text-align: justify; margin-top: 6pt; margin-bottom: 6pt;" dir="ltr"><strong><span id="docs-internal-guid-9a944e55-7fff-9126-a48a-24a537d52417" style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Synthesis, Characterization, and Performance of Hydrophobic Membranes Using Polyvinyl Pyrrolidone (PVP) as Additives. </span></strong><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">This paper discusses the synthesis, characterization and performance of polyethersulfone (PES) membranes modified with polyvinyl pyrrolidone (PVP) additives in order to improve the performance and antifouling properties of membranes. The modified PES membrane was prepared by adding 0.5% PVP as an additive, using dimethyl sulfoxide (DMSO) and n-methyl pyrrolidone (NMP) as solvents. The effect of adding additives to the membrane system was evaluated by analyzing changes in chemical structure using fourier transform infrared (FTIR), changes in surface morphology using scanning electron microscopy (SEM), tensile strength test using tensile strength meter, membrane porosity test using the gravimetric method, as well as testing the filtration performance and antifouling</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">properties. The results of membrane structure analysis by SEM showed the influence of the type of solvent and additives on changes in membrane morphology. In addition, membrane modification also increases porosity, permeation flux performance, and membrane antifouling properties. The results of the membrane filtration test showed that the water permeability of D-0.5 and N-0.5 membranes was 47.5 L/m</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: 0.6em; vertical-align: super;">2</span></span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">.h.atm and 41.5 L/m</span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: 0.6em; vertical-align: super;">2</span></span><span style="font-size: 8.5pt; font-family: 'Times New Roman'; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">.h.atm, respectively, with modified membrane antifouling properties larger than the membrane without modification.</span></p>
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Bajaj, Pooja, Albin Berzinis, Rachel Giessert e Carl Strom. "Applications of Low Voltage Field Emission Scanning Electron Microscopy (FE-SEM) for Characterization of Polyethersulfone/ Polyvinylpyrillidone (PES/PVP) Based Materials for Membrane Separations". Microscopy and Microanalysis 20, S3 (agosto de 2014): 2100–2101. http://dx.doi.org/10.1017/s1431927614012239.
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Le Petit, Lucie, Murielle Rabiller-Baudry, Romain Touin, Raphaël Chataignier, Patrick Thomas, Olivier Connan e Régis Périon. "Efficient and rapid multiscale approach of polymer membrane degradation and stability: Application to formulation of harmless non-oxidative biocide for polyamide and PES/PVP membranes". Separation and Purification Technology 259 (março de 2021): 118054. http://dx.doi.org/10.1016/j.seppur.2020.118054.
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Kusworo, Tutuk Djoko, Widayat Widayat, Dani Puji Utomo, Yulius Harmawan Setya Pratama e Riska Anindisa Vira Arianti. "Performance evaluation of modified nanohybrid membrane polyethersulfone-nano ZnO (PES-nano ZnO) using three combination effect of PVP, irradiation of ultraviolet and thermal for biodiesel purification". Renewable Energy 148 (abril de 2020): 935–45. http://dx.doi.org/10.1016/j.renene.2019.10.177.
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Basri, H., A. F. Ismail e M. Aziz. "Effect of PVP Addition in the Preparation of Polyethersulfone (PES)–AgNO3 Antibacterial Membrane". Journal of Applied Membrane Science & Technology 10, n.º 1 (20 de novembro de 2017). http://dx.doi.org/10.11113/amst.v10i1.70.
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Association of antibacterial agent into polymer–based material is an interesting, recent extension in membrane technologies research area. Asymmetric polyethersulfone–silver nitrate (PES–AgNO3) nanocomposite membranes were synthesized by wet phase inversion with polyvinylpyrrolidone (PVP) as additive. Three different molecular weights (MW) of PVP in the range of 10 K to 360 K were tested for their ability to stabilize and disperse silver in the polymer solution. Results showed that PVP 360 K plays a significant role in altering silver particle size with better dispersion compared to the membranes prepared without addition of PVP and with the addition of lower MW of PVP. Results agreed with the leaching detected by ICP–MS where silver loss during membrane fabrication for PES–Ag–P360 is only 0.4636 ppm (0.0093%). The antibacterial activity for the resultant membranes was tested using inhibition zone method. Results indicated that PES–AgNO3 and PES–AgNO3–PVP (loaded with only 0.5 wt% silver) were antibacterial to Escherichia coli and Staphylococcus aureus. The improvement of antibacterial properties of the prepared membranes could be primarily attributed to the PVP addition as well as the surface morphology and permeation properties.
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Fadli, Muhammad, Al Khausar, Sofyana Sofyana e Ummi Fathanah. "Karakteristik Membran Komposit Polietersulfon, Polivinilpirolidon dan Kitosan". Jurnal Serambi Engineering 6, n.º 4 (8 de outubro de 2021). http://dx.doi.org/10.32672/jse.v6i4.3476.
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Polyethersulfone (PES) is a membrane forming material that has many advantages but is hydrophobic, so it is necessary to add other materials, such as composite PES with Polyvinylpyrrolidone (PVP) and chitosan. The addition of PVP aims to change the nature of the PES membrane to be hydrophilic and the addition of chitosan aims to improve the mechanical properties of the polymer. The purpose of this study was to study the effect of adding PVP and chitosan to the characteristics of PES membranes. The membranes were made using a phase inversion technique by immersion precipitation with a concentration of 20% PES, 1% PVP, and chitosan were varied, namely 0% (M0 membrane), 1.5% (M1), 2% (M2), and 3% (M3). The results of the permeability test showed that the membranes M0, M1, M2, and M3 are classified as nanofiltration membranes with Lp values of 9.1237, 7.618, 6.9651, and 4.4077 L/m2.h.bar. The swelling degree value is 61,512; 103.111; 145,564; and 158.610% and the overall porosity value is 22.892; 32.360; 80.726; and 117.016%. The SEM test showed that the morphology of the membrane changed its structure as the concentration of chitosan increased. The FTIR test on the membrane showed that there were absorption bands, each of which identified its functional group.
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Irfan, Masooma, Hatijah Basri e M. Irfan. "An Experimental Investigation: Effect of Phase Inversion Methods on Membrane Structure and Its Performance on PEG Filtration". Journal of Applied Membrane Science & Technology 17, n.º 1 (13 de novembro de 2017). http://dx.doi.org/10.11113/amst.v17i1.11.
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In this work, the effect of different phase inversion process on membrane morphology and performance was studied. Polyethersulfone (PES) based polymeric membranes was fabricated containing polyvinylpyrrolidone (PVP) and carboxylic functionalized multiwall carbon nanotubes (MWCNT) as additives and polyethylene glycol (PEG) having a molecular weight 1K, 10K and 35K (Dalton) were used as a model solution for observing the rejection/filteration ability of fabricated membranes. Non-solvent induce phase separation (NIP) and dry-wet phase separation (DWP) method was adopted for membrane synthesis. The FTIR spectra showed that PVP/MWCNT was effectively blended with PES polymer and different phase inversion method led to different internal morphologies of membranes as confirmed by FESEM images. The PEG rejection results suggested that membranes formed by DWP method had approximately double rejection ability than membranes formed by NIP process.
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ACARER, Seren. "Effect of Different Solvents, Pore-Forming Agent and Solubility Parameter Differences on the Properties of PES Ultrafiltration Membrane". Sakarya University Journal of Science, 11 de outubro de 2022. http://dx.doi.org/10.16984/saufenbilder.1135285.
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In the production of polymeric membranes used in water treatment by the non-solvent-induced phase separation (NIPS) method, the materials used in the membrane casting solution and the interaction of these materials greatly affect the properties and performance of the obtained membranes. In this study, polyethersulfone (PES) membranes are produced by the NIPS method using two different solvents, dimethyl sulfoxide (DMSO) and N-methyl-2-pyrrolidone (NMP), and polyvinylpyrrolidone (PVP) as pore-forming agent. Chemical functional groups and morphologies of the produced membranes are investigated by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM), respectively. The viscosity of the membrane casting solutions and the hydrophilicity, porosity, mean pore size, and mechanical properties of the membranes are characterized. The pure water flux (PWF) of the membranes is determined at 1 and 3 bar pressures. The Hansen solubility parameters (HSP) of the materials used in membrane production are calculated and the effect of the interactions of DMSO, NMP, and PVP with PES and/or non-solvent (water) on the membrane properties are investigated.
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Zhang, Lu, Haoran Zhang, Jinhu Jiang, Dong Zhao, Chunyin Shen, Shangwen Zha, Shaoyi Qu, Ru Lin, Yanli Wang e Gance Dai. "Rheological behavior of PES / PVP / DMAc solution and PVP structural regulation for hollow fiber membrane". Journal of Applied Polymer Science, 8 de agosto de 2022. http://dx.doi.org/10.1002/app.52870.
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Abdulkarim, A. A., A. L. Ahmad, S. Ismail e B. S. Ooi. "Preparation and Characterization of Polyethersulfone Membrane Containing Zinc Oxide Nanoparticles and Polyvinylpyrrolidone". Jurnal Teknologi 65, n.º 4 (15 de novembro de 2013). http://dx.doi.org/10.11113/jt.v65.2320.
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Flat sheet polyethersulfone (PES) ultrafiltration membranes were fabricated by a dry/wet induced phase inversion process. Various ranges of ZnO concentrations (from 0 –5 wt. %) were utilized in conjunction with 16.5 and 2.5 wt. % of polyethersulfone and polyvinylpyrrolidone (PVP), respectively. The prepared membranes were characterized using scanning electron microscope (SEM), contact angle (CA), and flux/rejection performance. The modified membranes were tested on humic acid removal. The hydrophilicity of PES membrane was improved after addition of zinc oxide nanoparticles in the casting solution. Highest pure water flux was obtained at 5 wt.% ZnO nanoparticles. The modified membranes with 2.5 wt. % of zinc oxide exhibited higher humic acid flux and rejection.
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Keskin, Başak, Türkan Ormancı-Acar, Türker Türken, Derya Y. Imer e Ismail Koyuncu. "Effect of wetting agent on the dye filtration performance of ultrafiltration membrane". Water Science and Technology, 5 de agosto de 2020. http://dx.doi.org/10.2166/wst.2020.364.
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Abstract In this study, the wet phase inversion method was used for fabrication of the flat sheet ultrafiltration (UF) membranes. Three different polymer types and two different wetting agents were used for the fabrication. The effect of polymer types and wetting agents were investigated on the structural and dye performance of casted membranes. Two different synthetic dyes, 100 ppm Setazol Red and 100 ppm Setazol Blue, were used for the performance test. Viscosity, contact angle, and molecular weight cut off (MWCO) of casted membranes were measured and an electro kinetic analyzer, dynamic mechanical analyzer (DMA) and scanning electron microscope (SEM) were used to determine the structural properties. While the highest water and dye permeability were obtained with PES-PEG membrane, PSf-plain membrane gave the highest removal efficiency for Setazol Red and Setazol Blue dyes, which was found to be 78.33% and 82.52%, respectively, in the conditions of neutral pH and ambient temperature. Addition of PVP and PEG wetting agents improved the structural properties and permeability of membranes, but the dye removal was decreased as against plain ones. As the retention of PEG and PVP-based PSf and PES membrane was calculated at an average of 50%, they could be used for dye retention separately or could be a candidate as a pretreatment membrane prior to nanofiltration or reverse osmosis to make their lifetime longer.
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"Comparison of Citrate and Heparin Anticoagulation During Hemodialysis With MCO PES-PVP (Theranova) Membrane". Case Medical Research, 25 de outubro de 2019. http://dx.doi.org/10.31525/ct1-nct04139525.
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Chin, N., S. O. Lai, K. C. Chong, S. S. Lee, C. H. Koo e H. S. Thiam. "Treatment of Synthetic Produced Water using Hybrid Membrane Processes". Journal of Applied Membrane Science & Technology 22, n.º 2 (21 de novembro de 2018). http://dx.doi.org/10.11113/amst.v22n2.145.
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The study was concerned with the treatment of tank dewatering produced water using hybrid microfiltration (MF) and ultrafiltration (UF) processes. The pre-treatment MF membrane was fabricated with polyethersulfone (PES), n-methyl-2-pyrrolidone (NMP) and polyvinylpyrrolidone (PVP). The UF membranes meanwhile contained additional component, i.e., titanium dioxide (TiO2) nanoparticles in the range of zero to 1.0 wt.%. The membrane performances were analysed with respect to permeate flux, oil removal and flux recovery ratio. An increase in TiO2 nanoparticles enhanced the pore formation, porosity and pure water permeability due to improved hydrophilicity. The permeate flux of UF membranes increased with the increase of TiO2 nanoparticles and pressure. The oil removal rate by MF process was only 52.35%, whereas the oil rejection efficiency was between 82.34% and 95.71% for UF process. It should be highlighted that the overall oil removal rate could achieve as high as 97.96%. Based on the results, the PES membrane incorporated with 1.0 wt.% TiO2 was proved to be the most promising membrane at a transmembrane pressure of 3 bar. Although 1.0 M NaOH solution could be used as cleaning agent to recover membrane water flux, it is not capable of achieving good results as only 52.18% recovery rate was obtained.
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Ng, W. Q., S. O. Lai, K. C. Chong, S. S. Lee, C. H. Koo e W. C. Chong. "Reduction of Total Suspended Solids, Turbidity and Colour of Palm Oil Mill Effluent using Hybrid Coagulation-Fltrafiltration Process". Journal of Applied Membrane Science & Technology 23, n.º 1 (5 de dezembro de 2018). http://dx.doi.org/10.11113/amst.v23n1.144.
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High consumption and production of palm oil have led to the massive generation of palm oil mill effluent (POME). This study was intended to reduce the total suspended solids (TSS), turbidity and colour using hybrid coagulation-ultrafiltration process. POME was pre-treated with coagulation process using polyaluminium chloride (PAC) and optimization of operating condition for coagulation process was performed. The coagulation results revealed that optimum pH, dosage of coagulant and rapid mixing speed were pH 4, 600 mg/L and 200 rpm, respectively. It achieved the highest percent reduction of TSS, turbidity and colour with 99.74%, 94.44% and 94.60%, respectively. Ultrafiltration (UF) membrane was fabricated using polyethersulfone (PES), polyvinylpyrrolidone (PVP) and titanium dioxide (TiO2) nanoparticle. Different concentrations ranging from zero and 1.0 wt% of TiO2 nanoparticles were added into the dope solution. The characterization studies of UF membranes confirmed that higher concentration of TiO2 provided higher pure water permeability and more porous structure in the UF membranes. The amount of TiO2 in membrane only affected the permeate flux but had no obvious effects on the reduction of TSS, turbidity and colour. The optimum transmembrane pressure was found to be 3 bar, resulting in the greatest reduction of TSS, turbidity and colour.
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El-Zanati, Elham M., Eman Farg, Esraa Taha, Ayman El-Guindi e Heba Abdallah. "Preparation and characterization of different geometrical shapes of multi-bore hollow fiber membranes and application in vacuum membrane distillation". Journal of Analytical Science and Technology 11, n.º 1 (23 de outubro de 2020). http://dx.doi.org/10.1186/s40543-020-00244-4.
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Abstract Multi-bore hollow fiber membranes were prepared through phase inversion spinning process using new locally designed spinnerets of various geometrical shapes. The spun cylindrical-like, rectangular or ribbon-like, and triangular-like are prepared, dried, and characterized by scanning electronic microscope. Fibers of circular (seven, five, and four bores) shape, rectangular of five bores, and triangular of three bores were chosen to study the effect of both geometrical configuration and the number of bores on the amorphous structure and the mechanical properties of the membranes. Membrane geometry, surface amorphous, and bore arrangements are very sensitive to the operating conditions, especially the extrusion and drawing rates. Three polymeric blends of different compositions are used to prepare multi-bore hollow fiber membranes. This study revealed that the blend composition of PES 16%, PVP 2%, PEG 2%, diethylene glycol 2%, and NMP 78% gives excellent mechanical properties. Optimization of the preparation conditions also developed, where the dope flow rate, the bore flow rate, and the air gap were 1.14 cm3 s−1, 1.1 cm3 s−1, and 0 cm, respectively. Furthermore, this study proved that the circular arrangement has high mechanical strength. The prepared seven-MBHF membranes were applied in the membrane distillation process, a solution of 35 g/l NaCl was used to test the membrane performance, and the achieved flux and rejection were 28.32 L/m2 h and 98.9%, respectively. This performance demonstrated that the prepared membrane in this way is suitable to compete with conventional reverse osmosis technology that uses single track hollow fibers.
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Eskitoros-Togay, Ş. Melda, Y. Emre Bulbul, Zeynep Kubra Cınar, Alpay Sahin e Nursel Dilsiz. "Fabrication of PVP/sulfonated PES electrospun membranes decorated by sulfonated halloysite nanotubes via electrospinning method and enhanced performance of proton exchange membrane fuel cells". International Journal of Hydrogen Energy, outubro de 2022. http://dx.doi.org/10.1016/j.ijhydene.2022.09.214.
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