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Artykuły w czasopismach na temat "PVP Ultrafiltration membrane"
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Bai, Yang, Zhen Liu i Dao Bao Sun. "Preparation and Performance of Polysulfone Hollow Fiber Ultrafiltration Membranes". Applied Mechanics and Materials 457-458 (październik 2013): 309–12. http://dx.doi.org/10.4028/www.scientific.net/amm.457-458.309.
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Polysulfone (PSF) hollow fiber ultrafiltration membranes were successfully prepared by dry-wet spinning technology. Dimethylacetamide (DMAC) was used as a solvent, water was used as bore liquid and coagulation bath, polyvinylpyrrolidone (PVP) was used as polymeric additive. The effects of spinning conditions on membrane structures and properties were investigated in present study. The results indicated that with the increase of PVP concentration, pure water flux increased and developed finger-like pores were formed. High coagulation bath temperature restricted pure water flux, 30°C was the best for the preparation of high-performance ultrafiltration membranes. When the air length was 11cm, the membrane comprehensive performance was the best.
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Liu, Xiao Mian, Zong Hua Wang, Bing Yu, Hai Lin Cong, Xiu Ling Gao i Xin Yu Guo. "PMMA Modified PVDF Hollow Fiber Ultrafiltration Membranes". Advanced Materials Research 465 (luty 2012): 229–33. http://dx.doi.org/10.4028/www.scientific.net/amr.465.229.
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Polymethylmethacrylate (PMMA) modified poly(vinylidene fluoride) (PVDF) hollow fiber ultrafiltration membranes were prepared by wet spinning method using polyvinylpyrrolidone (PVP) as pore-foaming agent and mixture of dimethyl formamide (DMF)/methyl ethyl ketone (MEK) as solvent. The effects of PVDF, PMMA, PVP, and solvent ratios in the spinning solution on the permeation properties of the formed membranes were studied. The results showed that the performance of the membrane is the best with a pure water flux of 117 L/m2•h and rejection rate of 82% to bovine serum albumin (BSA), when the concentrations of PVDF, PMMA, PVP, DMF and MEK are 17, 3, 3, 60 and 17 wt%, respectively.
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Febriasari, Arifina, Huriya, Annisa Hasna Ananto, Meri Suhartini i Sutrasno Kartohardjono. "Polysulfone–Polyvinyl Pyrrolidone Blend Polymer Composite Membranes for Batik Industrial Wastewater Treatment". Membranes 11, nr 1 (18.01.2021): 66. http://dx.doi.org/10.3390/membranes11010066.
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Batik wastewater, in general, is colored and has high concentrations of BOD (biological oxygen demand), COD (chemical oxygen demand), and dissolved and suspended solids. Polysulfone (PSf)-based membranes with the addition of polyvinyl pyrrolidone (PVP) were prepared to treat batik industrial wastewater. PSf/PVP membranes were prepared using the phase inversion method with N-methyl-2 pyrrolidone (NMP) as the solvent. Based on the membrane characterization through FESEM, water contact angle, porosity, and mechanical tests showed a phenomenon where the addition of PVP provided thermodynamic and kinetic effects on membrane formation, thereby affecting porosity, thickness, and hydrophilicity of the membranes. The study aims to observe the effect of adding PVP on polysulfone membrane permeability and antifouling performance on a laboratory scale through the ultrafiltration (UF) process. With the addition of PVP, the operational pressure of the polysulfone membrane was reduced compared to that without PVP. Based on the membrane filtration results, the highest removal efficiencies of COD, TDS (total dissolved solid), and conductivity achieved in the study were 80.4, 84.6, and 83.6%, respectively, on the PSf/PVP 0.35 membrane operated at 4 bar. Moreover, the highest color removal efficiency was 85.73% on the PSf/PVP 0.25 operated at 5 bar. The antifouling performance was identified by calculating the value of total, reversible, and irreversible membrane fouling, wherein in this study, the membrane with the best antifouling performance was PSf/PVP 0.25.
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Chen, Yuliang, Libo Ba, Yini He i Xuesong Yi. "Removal Efficiency of Sulfapyridine from Contaminated Surface Water by Carboxylated Graphene Oxide Blended PVDF Composite Ultrafiltration Membrane with Activated Carbon". Polymers 14, nr 21 (7.11.2022): 4779. http://dx.doi.org/10.3390/polym14214779.
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In this study, sulfapyridine (SPY), an antibiotic that is less commonly treated by membrane filtration techniques but is frequently detected in the aqueous environment and at higher concentrations than other detected antibiotics, was selected for investigation. A composite ultrafiltration membrane for the removal of sulfapyridine (SPY) antibiotics from water was fabricated using polyvinylidene fluoride (PVDF), polyvinylpyrrolidone (PVP), and carboxyl-functionalized graphene oxide (CFGO) as additives. The changes in retention rate and pure water flux of sulfapyridine by the composite ultrafiltration membrane were investigated by changing the ratios of the prepared ultrafiltration membrane materials under the conditions of low-pressure operation to explore the optimal experimental conditions. The results showed that the addition of PVP and CFGO significantly increased the number of membrane pores and their pore size. The addition of CFGO in the membrane significantly improved the hydrophilicity of the membrane. The contact angle decreased from 83.7 to 31.6°. Compared to ordinary PVDF ultrafiltration membranes, the membrane’s pure water flux increased nearly three times to 2612.95 L/(m2·h). The removal rate of SPY was 56.26% under the optimal conditions. When the composite ultrafiltration membrane was combined with activated carbon, the removal rate of SPY was 92.67%, which was nine times higher than that of activated carbon alone. At this time, the flux of the composite membrane was 2610.23 L/(m2·h). This study proposes a simple, efficient, and low production cost solution for the removal of sulfapyridine from water.
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Zhang, Shan, i Zhen Liu. "Preparation and Characterizations of Polysulfone Flat Ultrafiltration Membranes". Advanced Materials Research 418-420 (grudzień 2011): 169–72. http://dx.doi.org/10.4028/www.scientific.net/amr.418-420.169.
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The Polysulfone Flat ultrafiltration membranes were prepared with dimethylacetamide (DMAc) as solvent and polyvinypyrrolidone (PVP) as pore forming additive. Performance of PSF membrane such as pure water flux, albumin egg rejection were investigated. In addition, the same investigations were conducted with different coagulation bath temperature and evaporation time. The results show that there were a maximum of pure water flux and a minimum of the retention of Albumin when PVP content reach 14%.
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Mutlu Salmanli, Öykü, Sevgi Güneş Durak, Güler Türkoğlu Demirkol i Neşe Tüfekci. "Effect of PVP concentration on prepared PEI membranes for potential use on water treatment: effect of additive on membranes prepared for water treatment". Water Supply 19, nr 7 (4.06.2019): 2072–78. http://dx.doi.org/10.2166/ws.2019.084.
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Abstract In this work, a series of polyetherimide (PEI) flat sheet membranes were produced with different concentrations of polyvinylpyrrolidone (PVP) addition via the phase inversion method. The effects of additions on membrane morphology and performance were investigated. Synthesized membrane had the properties of ultrafiltration membrane. Although PEI is not widely used for water treatment, in this study, the ferrous iron removal rate was investigated and good results were obtained. Through the membrane production experiments, the PEI content was 22 wt%. PVP was added as a pore-forming agent with concentrations of 2, 4 and 8 wt%. N-methyl-2-pyrrolidone (NMP) was used as solvent. Distilled water was used for the coagulation bath. After production, all membranes were characterized by using contact angle, permeability, porosity, and scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT/IR) analyses. With the increasing doses of PVP addition, the permeability of the PEI membranes produced in this study increased, while porosity results were changeable. The permeability was 23 L/m2h bar for the membrane with 2 wt% PVP content, while the permeability for the membrane with 8 wt% PVP content was 32 L/m2h bar. Contact angles increased with PVP addition to PEI membranes. With the increasing PVP concentration, the finger-like pores and the pores located in the sub-layer expanded.
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Güneş-Durak, Sevgi, Türkan Ormancı-Acar i Neşe Tüfekci. "Effect of PVP content and polymer concentration on polyetherimide (PEI) and polyacrylonitrile (PAN) based ultrafiltration membrane fabrication and characterization". Water Science and Technology 2017, nr 2 (27.03.2018): 329–39. http://dx.doi.org/10.2166/wst.2018.142.
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Abstract In this study, four different membranes were fabricated by using polyetherimide and polyacrylonitrile polymers, N-methyl-2-pyrrolidone and polyvinylpyrrolidone (PVP) via phase inversion method to improve the membrane performance in fruit juice wastewater (FJWW) treatment. The addition of PVP to the casting solution increased membrane hydrophilicity, water content, contact angle, porosity, Fourier transform infrared spectroscopy peaks, membrane thickness, average roughness and viscosity of cast solutions compared to the bare membrane. It can be said that the addition of a lower polymer concentration and PVP intensively increases the pure water flux of the membrane. However, as the flux increased, a small decrease in FJWW rejection was observed.
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Pasaoglu, Mehmet Emin, Serkan Guclu i Ismail Koyuncu. "Polyethersulfone/polyacrylonitrile blended ultrafiltration membranes: preparation, morphology and filtration properties". Water Science and Technology 74, nr 3 (4.06.2016): 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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Gryta, Marek, i Piotr Woźniak. "The Resistance of Polyethersulfone Membranes on the Alkaline Cleaning Solutions". Membranes 14, nr 2 (23.01.2024): 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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Kartohardjono, Sutrasno, Ghofira Muna Khansa Salsabila, Azzahra Ramadhani, Irfan Purnawan i Woei Jye Lau. "Preparation of PVDF-PVP Composite Membranes for Oily Wastewater Treatment". Membranes 13, nr 6 (20.06.2023): 611. http://dx.doi.org/10.3390/membranes13060611.
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The oil and gas industry and related applications generate large quantities of oily wastewater, which can adversely affect the environment and human health if not properly handled. This study aims to prepare polyvinylidene fluoride (PVDF) membranes incorporated with polyvinylpyrrolidone (PVP) additives and utilize them to treat oily wastewater through the ultrafiltration (UF) process. Flat sheet membranes were prepared using PVDF dissolved in N,N-dimethylacetamide, followed by the addition of PVP ranging from 0.5 to 35 g. Characterization by scanning electron microscopy (SEM), water contact angle, Fourier transform infrared spectroscopy (FTIR), and mechanical strength tests were performed on the flat PVDF/PVP membranes to understand and compare the changes in the physical and chemical properties of the membranes. Prior to the UF process, oily wastewater was treated by a coagulation–flocculation process through a jar tester using polyaluminum chloride (PAC) as a coagulant. Based on the characterization of the membrane, the addition of PVP improves the physical and chemical properties of the membrane. The membrane’s pore size becomes larger, which can increase its permeability and flux. In general, the addition of PVP to the PVDF membrane can increase the porosity and decrease the water contact angle, thereby increasing the membrane’s hydrophilicity. With respect to filtration performance, the wastewater flux of the resultant membrane increases with increasing PVP content, but the rejections for TSS, turbidity, TDS, and COD are reduced.
Rozprawy doktorskie na temat "PVP Ultrafiltration membrane"
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Pellegrin, Bastien. "Analyse multi-échelle de la dégradation de membranes d'ultrafiltration en polyethersulfone - poly(N-vinyl pyrrolidone) en conditions d'usage". Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2084/.
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Ces travaux portent sur l'étude du vieillissement de membranes d'ultrafiltration en PES / PVP. Ils sont motivés par le constat industriel de l'endommagement des membranes au cours de leur utilisation. Il est démontré que l'hypochlorite de sodium utilisé lors des procédures de lavages sur site de production d'eau potable est le principal responsable du vieillissement des membranes. Cette dégradation chimique conduit à une oxydation radicalaire de la PVP (avec et sans rupture de chaînes), entraînant son élimination partielle de la structure de la membrane. Ce phénomène provoque une augmentation de la perméabilité à l'eau pure, une diminution de la sélectivité et une altération des propriétés mécaniques de la membrane. Une relation directe entre l'évolution de l'allongement à la rupture (déterminé par essais de traction) et la quantité de PVP contenue dans les 40 premiers microns en dessous de la surface de la membrane est notamment établie. Nous mettons également en évidence la relative stabilité de la PES. L'exposition de la PES à l'hypochlorite provoque la formation de phénols ortho-substitués (sans rupture de chaînes), uniquement en présence de PVP. En plus de l'altération de la sélectivité et des propriétés mécaniques, d'un point de vue applicatif, ces modifications chimiques donnent lieu à une augmentation de la sensibilité au colmatage. Les résultats de cette étude de vieillissement accéléré en laboratoire sont supportés par l'analyse de membranes issues de modules ayant opéré durant plusieurs années sur site de production d'eau potable. En effet, les marqueurs macroscopiques et moléculaires de la dégradation présentent, dans les deux cas, les mêmes évolutions. Cependant, l'accent est mis sur l'invalidité du concept de dose, très largement utilisé pour quantifier l'avancement de la dégradation. En effet, nous démontrons que, dans la gamme de concentrations et de temps que nous avons étudié, il existe un effet prépondérant de la concentration par rapport au tempsMotivated by drinking water production plants reporting membrane failure issues, this study investigates the ageing of a commercially available PES / PVP UF hollow fiber. Proof is given that membrane degradation is mainly induced by sodium hypochlorite exposure. The effects on the PES chemical structure are limited, very low extend of chain scission occurs and the formation of an ortho-substituted phenol is observed as the main modification. Experiments show that the presence of PVP and/or PVP degradation products is a required condition for the PES oxidation to occur. On the other hand, PVP appears to be very sensitive to hypochlorite exposure. PVP radical oxidation mechanisms are identified presenting a maximal reaction rate for neutral to slightly basic pH and leading to the partial removal of the PVP degradation products from the membrane structure. Correlation of macroscopic and molecular characterizations demonstrates that PVP degradation is responsible for the membrane integrity loss (impairing selectivity and mechanical performance), while hypochlorite exposure also induces enhanced membrane / solutes interactions, leading to an accentuated fouling. The representativeness of static continuous hypochlorite exposure regarding the actual on-site membrane ageing is confirmed by the analysis of membranes extracted from an industrially operated module. Nevertheless, the hypochlorite dose parameter, widely used in the literature, is demonstrated to be inappropriate to describe the degradation rate: the hypochlorite concentration impact is shown to be dominating the exposure time impact on the degradation rate
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Kavugho, Mission Sophie. "Formulation et étude de nouveaux détergents enzymatiques pour le nettoyage des membranes d'ultrafiltration de l'industrie laitière : développement et validation de méthodologies associées". Electronic Thesis or Diss., Université de Rennes (2023-....), 2024. http://www.theses.fr/2024URENS005.
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L’ultrafiltration (UF) du lait écrémé pour la standardisation de la teneur en protéines pour la fabrication des fromages est un procédé membranaire très répandu à l’échelle industrielle. Cependant, le colmatage des membranes par des protéines du lait écrémé provoque une baisse de la productivité et constitue un verrou de ce procédé.Ainsi, l’étape de nettoyage/désinfection bi-quotidienne est indispensable afin de restaurer les performances de la membrane et d’assurer la sécurité sanitaire ainsi que la qualité des produits. Elle est en général réalisée avec des détergents formulés alcalins et acides mais il est également possible d’utiliser des détergents enzymatiques formulés ayant la réputation d’être plus efficaces. Cependant, peu d’études fondamentales existent à ce sujet, ce que cette thèse se propose de contribuer à combler. L’objectif de cette thèse a été de développer de nouveaux détergents enzymatiques efficaces et compatibles avec la membrane en PES/PVP largement utilisée pour l’UF de lait écrémé. La cible du nettoyage est un dépôt de protéines. La démarche s’est appuyée sur une méthodologie d’aide à la formulation de détergents fondée sur la mesure des dépôts résiduels sur la membrane par ATR-FTIR: que ce soit les protéines, les enzymes ou les autres constituants des détergents étudiés. De multiples prototypes ont été formulés en collaboration avec la société Kersia. Leur évaluation a suivi 3 étapes: i) des tests rapides en réacteur fermé (14 cm²) pour sélectionner les détergents prometteurs selon leur efficacité d’élimination du colmatage protéique, leur rinçabilité et le respect de l’intégrité de la membrane à court termes, ii) la transposition des résultats prometteurs en condition de filtration (127 cm²) validant également la filtrabilité des détergents, iii) enfin, la validation de la compatibilité détergent/membrane sur le long terme grâce au vieillissement accéléré sous micro-onde (3 cm²), et au nettoyage d’une membrane spirale (6.8 m²) pendant 52 heuresUltrafiltration (UF) of skim milk for standardization of the protein content for cheese making is a very common membrane process at industrial scale. However, fouling of the membranes with skim milk proteins causes a drop in productivity and constitutes a barrier to this process. Thus, the twice-daily cleaning/disinfection step is essential to restore the performance of the membrane and ensure health safety and product quality. It is generally carried out with alkaline and acidic formulated detergents, but it is also possible to use formulated enzymatic detergents which enjoy the reputation of being more effective. However, few fundamental studies exist on this subject, which this thesis aims to contribute to fill. The objective of this thesis was to develop new enzymatic detergents that are are effecient and compatible with the PES/PVP membrane widely used for skim milk UF. The target of the cleaning is a protein deposit. The approach was based on a methodology to aid the formulation of detergents based on the measurement of residual deposits on the membrane by ATR-FTIR: whether proteins, enzymes or other constituents of the detergents studied. Mutliple prototypes were formulated in collaboration with Kersia Company. Their evaluation followed 3 steps: i) rapid tests in a batch reactor (14 cm²) to select promising detergents according to their effectiveness in eliminating protein fouling, their cleanability and the integrity of the membrane in the short term, ii) transposition of promissing results under filtration conditions (127 cm²) also validating the filterability detergents, iii) finally, validation of detergent/membrane compatibility over the long term thanks to accelerated aging under microwave (3 cm²) and cleaning of the spiral wound membrane (6.8 cm²) for 52 hours
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Chen, Chen. "Synthesis and improvement of high performance PVC and PVDF ultrafiltration membranes". Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53535.
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The applications of membrane technologies have dramatically increased during the last few decades due to technology improvement and cost reduction. Membrane applications can be found in water and wastewater treatment, pharmaceutical industry, chemical processing industry, food industry, etc. However, the membrane technology faces two major challenges: membrane fouling and membrane lifetime. During the membrane filtration process, membrane fouling caused by natural organic matter (NOM) is an inevitable phenomenon, and physical cleaning or chemical cleaning are required for recovering the performance of membrane. As a result of these cleaning processes, membrane lifetime is shortened. For this reason, it is necessary to improve membrane's fouling resistance and lifetime in order to apply membrane technology in large-scale facilities.
This dissertation focuses on improving the fouling resistance and flux performance of polyvinyl chloride (PVC) membrane and polyvinylidene fluoride (PVDF) membrane. Specifically, it is comprised of four parts. First, I prepared PVC membranes by adding different amounts of amphiphilic copolymer (Pluronic F 127) into PVC casting solutions. I optimized the performance of PVC membranes by changing the amount of Pluronic F127 used in the casting solution. The results show that with the increase of Pluronic F 127 content, the pore size and pore density both decrease. Moreover, the membrane surface becomes more hydrophilic as indicated by lower contact angles. In addition, the PVC membrane exhibits remarkable antifouling characteristics after adding Pluronic F 127. Second, I synthesized PVDF membranes by adding PVDF graft poly(ethylene glycol) methyl ether methacrylate (PEGMA) (PVDF-g-PEGMA) as additive in casting solutions via the phase inversion method. The synthesized PVDF membranes have unique pillar-like structures on surfaces, which gives the PVDF membrane a defect-free feature and allows it to generate high flux under low pressure. Third, I investigated the forming mechanism of the pillar-like structure from aspects of solvent and additive. Finally, I investigated the influence of PEGMA dose on the performance of PVDF membranes. I changed the amount of PEGMA used in the casting solution and compared the performance of the synthesized PVDF membranes.
To summarize, this dissertation has deepened our understanding of how to improve the fouling resistance and flux performance of PVC membranes and PVDF membranes by using amphiphilic copolymer. In addition, the PVDF membrane I synthesized has unique pillar-like structures that give it defect-free and high flux properties. Overall, the results of this study provide valuable information for PVC and PVDF membrane synthesis for large-scale production.
Części książek na temat "PVP Ultrafiltration membrane"
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Mokhtar, Hamizah, Afizah Ayob, Siti Aisyah Ishak, Duratul Ain Tholibon, Siti Safirah Rashid, Nurul Aishah Abd Rahman i Noor Safwan Muhamad. "Flat Sheet PSF/PVP Ultrafiltration Membrane for Leachate Treatment". W Lecture Notes in Civil Engineering, 327–42. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-6022-4_21.
Pełny tekst źródłaStreszczenia konferencji na temat "PVP Ultrafiltration membrane"
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Li, Wei-Ying, Ming Zhang, Jian Pei i Ling Chen. "The Adsorption of Microcystins by Polyvinylchloride (PVC) Ultrafiltration Membrane". W 2009 3rd International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2009. http://dx.doi.org/10.1109/icbbe.2009.5163568.
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