Articles de revues : « TiO2 nanocomposite »

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Kustiningsih, Indar, Asep Ridwan, Devi Abriyani, Muhammad Syairazy, Teguh Kurniawan et Dhena Ria Barleany. « Development of Chitosan-TiO2 Nanocomposite for Packaging Film and its Ability to Inactive Staphylococcus Aureus ». Oriental Journal of Chemistry 35, n^o 3 (18 juin 2019) : 1132–37. http://dx.doi.org/10.13005/ojc/350329.

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The aim of present study is to synthesize chitosan-TiO2 nanocomposite for packaging and its ability to inactive Staphylococcus aureus. TiO2 Degussa P25 were dispersed in chitosan matrix in order to produce film-forming solution. The samples were characterized by SEM, FTIR, tensile strength, antibacterial and biodegradable test. The tensile strength test results showed that Cs-0.1Ti was the best nanocomposite compared to other variations of TiO2 addition. Whereas for the test of S. aureus bacteria showed that no more S. aureus bacteria were found in chitosan-TiO2 nanocomposite after incubation for 24 hours. It indicated more effective use of nanocomposites by adding TiO2 compared to without adding TiO2. For biodegradation analysis, the addition of TiO2 slows the nanocompostites degradation process, which is indicated by the less mass loss that occurs in Cs-0.5 Ti nanocomposite.

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Alakrach, Abdulkader M., Awad A. Al-Rashdi, Mohamed Khalid Al-Omar, Taha M. Jassam, Sam Sung Ting, Omar S. Dahham et Nik Noriman Zulkepli. « Physical and Barrier Properties of Polylactic Acid/Halloysite Nanotubes-Titanium Dioxide Nanocomposites ». Materials Science Forum 1021 (février 2021) : 280–89. http://dx.doi.org/10.4028/www.scientific.net/msf.1021.280.

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In this study, PLA/TiO2 and PLA/HNTs-TiO2 nanocomposites films were fabricated via solution casting method. By testing the film density, solubility, water contact angle and water vapor permeability, the PLA nanocomposite films, the comprehensive performances of the nanocomposites were analysed. The outcomes demonstrated that maximum film density of PLA/TiO2 and PLA/HNTs-TiO2 nanocomposites films increased gradually with the increasing of nanofiller loadings. Moreover, the incorporation of TiO2 and HNTs-TiO2 significantly decreased the water vapor transmittance rate of the nanocomposite films with a slight priority to the addition of HNTs-TiO2, the water solubility was significantly improved with the addition of both nanofillers. Furthermore, the barrier properties were developed with the addition of both TiO2 and HNTs-TiO2 especially after the addition of low nanofiller loadings. Overall, the performance of the PLA/HNTs-TiO2 nanocomposite films was better than that PLA/TiO2 film. Nevertheless, both of the PLA nanocomposite samples achieved the requests of food packaging applications.

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Mai Xuan, Truong, Cuong Tran Manh, Huong Hau Van et Nguyen Bui Duc. « Visible light photocatalytic activity of TiO2/MWCNTS nanocomposite prepared using hydrothermal method ». Vietnam Journal of Catalysis and Adsorption 10, n^o 1S (15 octobre 2021) : 334–38. http://dx.doi.org/10.51316/jca.2021.121.

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Titanium dioxide nanocomposites/multi-walled carbon nanotubes (TiO2/MWCNTs) were successfully synthesized by hydrothermal method. The synthesized TiO2/MWCNTs nanocomposites (10, 30 and 50% TiO2/MWCNTs) nanocomposites were characterized with powder X-ray diffraction (XRD), transmission electron microscope(TEM) and UV–visible diffuse reﬂection spectrum (DRS). The photocatalytic activity of TiO2/MWCNTs nanocomposite for the degradation of Rhodamin B (RhB) under visible light irradiation was studied. Compared with pure TiO2 nanoparticles, the TiO2/MWCNTs nanocomposite displayed higher photocatalytic activity for the degradation of RhB and the 30% TiO2/MWCNTs photocatalyst exhibited the highest photocatalytic activity.

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Fajriati, Imelda, Mudasir Mudasir et Endang Tri Wahyuni. « Photocatalytic Decolorization Study of Methyl Orange by TiO₂–Chitosan Nanocomposites ». Indonesian Journal of Chemistry 14, n^o 3 (21 octobre 2014) : 209–18. http://dx.doi.org/10.22146/ijc.21230.

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The photocatalytic decolorization of methyl orange (MO) by TiO2-chitosan nanocomposite has been studied. This study was started by synthesizing TiO2-chitosan nanocomposites using sol-gel method with various concentrations of Titanium(IV) isopropoxide (TTIP) as the TiO2 precursor. The structure, surface morphology, thermal and optical property of TiO2-chitosan nanocomposite were characterized by X-ray diffraction (XRD), fourier transform infra red (FTIR) spectroscopy, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and diffuse reflectance ultra violet (DRUV) spectroscopy. The photocatalytic activity of TiO2-chitosan nanocomposite was evaluated by photocatalytic decolorization of methyl orange as a model pollutant. The results indicate that the particle size of TiO2 increases with increasing ofthe concentration of TTIP, in which TiO2 with smallest particle size exhibit the highest photocatalytic activity. The highest photocatalytic decolorization was obtained at 5 h of contact time, initial concentration of MO at 20 ppm and at solution pH of 4. Using these conditions, over 90% of MO was able to be decolorized using 0.02 g of TiO2-chitosan nanocomposite under UV light irradiation. The TiO2-chitosan nanocomposite could be reused, which meant that the TiO2-chitosan nanocomposites can be developed as an effective and economical photocatalyst to decolorize or treat dye in wastewater.

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Pon Maha Lakshmi, P., C. Vedhi et P. Rajakani. « Electrocatalytic Activity of PMMA–Anatase TiO₂ Nanocomposites ». ECS Transactions 107, n^o 1 (24 avril 2022) : 3933–44. http://dx.doi.org/10.1149/10701.3933ecst.

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We characterized optically and electrochemically synthesised pure PMMA and PMMA–TiO2 nanocomposites developed through various proportions of anatase TiO2 (TiO2 (A)) added by chemical polymerization at room temperature. The characterization of the nanocomposite was carried out using FT-IR, UV-Vis, XRD, and FESEM. Cyclic voltammetric studies exhibit good adherent behaviour on the electrode surface at pH 7.0 for PMMA and pH 4.0 for PMMA–TiO2 nanocomposite. It has been observed that PMMA–TiO2 nanocomposite modified GCE has good oxygen reduction ability, and also enhances resistance behaviour.

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Fajriati, Imelda, Mudasir Mudasir et Endang Tri Wahyuni. « Adsorption and Photodegradation of Cationic and Anionic Dyes by TiO₂-Chitosan Nanocomposite ». Indonesian Journal of Chemistry 19, n^o 2 (9 avril 2019) : 441. http://dx.doi.org/10.22146/ijc.38278.

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The adsorption and photodegradation of cationic and anionic dyes by TiO2-chitosan nanocomposites have been studied. This study investigated the specific surface area, pores volume, pores size of TiO2-Chitosan nanocomposite, and determination kinetics of the reaction on the adsorption and photodegradation process. The methods were carried out by mixing TiO2-nanocomposite into cationic and anionic dyes in various contact times and initial dye concentrations. The results showed that nanocomposite adsorption capacity increased with an increase in the amount of chitosan (TiO2/Chit 0.13) even though the specific surface area (SBET) was reduced. The results indicated that the adsorption on nanocomposite was influenced by the amount of -NH2 and -OH on the chitosan surface. The maximum adsorption capacity (qm) and the observed reaction constant (kObs) for MO were also known to be higher than MB, which means that the TiO2-chitosan nanocomposites could remove anionic dye more than cationic one.

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Oktarina, Kurniawati. « REMOVAL OF DYES IN SONGKET WASTE WATER BY USING PHOTOCATALYST Chitosan-TiO2 ». Jurnal Distilasi 4, n^o 1 (28 janvier 2020) : 1. http://dx.doi.org/10.32502/jd.v4i1.2153.

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Photocatalyst is one of the catalysts that works when given a certain light and generally is a semiconductor that has a full valence band and an empty conduction band, such as TiO2. Synthesis of chitosan-TiO2 nanocomposite research has been carried out, nanocomposites produced from squid cartilage as chitosan-?. Nanocomposites are synthesized by combining chitosan as a supporting material and TiO2 which has a function as a high photocatalytic. Characterization of chitosan-TiO2 nanocomposites by FTIR and SEM / EDX which shows the functional groups and surface morphology of the nanocomposite. FTIR analysis shows the absorption band of O-Ti-O in the region of 678.98 cm-1 and the typical absorption of chitosan at wave numbers –OH 3425.58 cm 1, 3834.49 cm-1, and 3873.06 cm-1. From SEM / EDX analysis it can be seen that TiO2 is evenly distributed on the surface of chitosan. Then nanocomposite was applied with wrna procion in Palembang songket liquid waste. Chitosan-TiO2 nanocomposites from squid cartilage were able to degrade procion dyes in water medium with the help of UV light at the optimum wavelength of 520 nm, where the percentage of photodegradation was 54.47%. Which nanocomposite is also able to reduce the concentration of procion dyes from 5 mg / L to 1.9 mg / L with an initial acidity (pH) of 10.34 to 7.13. Key words: Photocatalyst, nanocomposites, Procion Red

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ABBASI, AMIRALI, et JABER JAHANBIN SARDROODI. « ADSORPTION OF THIOPHENE ON N-DOPED TiO2/MoS2 NANOCOMPOSITES INVESTIGATED BY VAN DER WAALS CORRECTED DENSITY FUNCTIONAL THEORY ». Surface Review and Letters 25, n^o 01 (janvier 2018) : 1850038. http://dx.doi.org/10.1142/s0218625x18500385.

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Comparison of structural and electronic properties between pristine and N-doped titanium dioxide-(TiO2)/molybdenum disulfide (MoS2) nanocomposites and their effects on the adsorption of thiophene molecule were performed using density functional theory calculations. To correctly estimate the adsorption energies, the van der Waals interactions were taken into account in the calculations. On the TiO2/MoS2 nanocomposite, thiophene molecule tends to be strongly adsorbed by its sulfur atom. The five-fold coordinated titanium atom of TiO2 was found to be an active binding site for thiophene adsorption. The results suggest that the thiophene molecule has not any mutual interaction with MoS2 nanosheet. The electronic structures of the complex systems are discussed in terms of the density of states and molecular orbitals of the thiophene molecules adsorbed to the TiO2/MoS2 nanocomposites. It was also found that the doping of nitrogen atom is conductive to the interaction of thiophene with nanocomposite. Thus, it can be concluded that the interaction of thiophene with N-doped TiO2/MoS2 nanocomposite is more energetically favorable than the interaction with undoped nanocomposite. The sensing capability of TiO2/MoS2 toward thiophene detection was greatly increased upon nitrogen doping. These processes ultimately lead to the strong adsorption of thiophene on the N-doped TiO2/MoS2 nanocomposites, indicating potential applicability of these nanocomposites as novel gas sensors.

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Alakrach, Abdulkader M., Awad A. Al-Rashdi, Taha Alqadi, Mohammed Abdulhakim Al Saadi, Sam Sung Ting, Omar S. Dahham et Nik Noriman Zulkepli. « Polylactic Acid/Halloysite Nanotubes-Titanium Dioxide Nanocomposites : Antibacterial and Mechanical Properties ». Materials Science Forum 1021 (février 2021) : 270–79. http://dx.doi.org/10.4028/www.scientific.net/msf.1021.270.

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Polylactic acid (PLA) nanocomposite samples with different properties like mechanical, thermal, barrier and antibacterial properties are good candidates as packaging biomaterials. Unique PLA/TiO2 and PLA/HNTs-TiO2 nanocomposite samples were fabricated by solution casting method. The mechanical and antibacterial properties of PLA/TiO2 and PLA/HNTs-TiO2 samples were investigated with comparing to the pristine PLA film as a control sample. PLA nanocomposite samples with TiO2 nanofillers showed poorer mechanical properties while PLA ﬁlms with PLA/HNTs-TiO2 showed unique developments, which tensile strength improved by 46% with the incorporation of 5 wt%. The PLA nanocomposites showed a high efficiency to both Gram positive and Gram negative bacteria, significant antibacterial effect being proved after first week elapsed time by comparing to the control sample (presenting no antibacterial effect). By considering the multifunctional characteristics of PLA/TiO2 and PLA/HNTs-TiO2 nanocomposites, the samples produced by solution casting can be considered a favourable alternative as environmental-friendly packaging materials.

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Buasri, Achanai, Pornpimon Loakhonka, Tanaporn Benjapolchai, Nitchanan Chusripet et Vorrada Loryuenyong. « Surface Modification and Characterization of Photodegradable Polystyrene-TiO₂ Nanocomposites ». Applied Mechanics and Materials 372 (août 2013) : 128–31. http://dx.doi.org/10.4028/www.scientific.net/amm.372.128.

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In this study, polystyrene (PS) nanocomposites with TiO2 and surface-modified TiO2 nanoparticles were prepared by compression molding method. TiO2 nanoparticles were modified by 3-(methacryloxy) propyl trimethoxysilane (MPS). The resulting nanocomposite thick films were compared with pure polystyrene. It was found that MPS-modified TiO2 nanoparticles were better dispersed in PS matrix due to their hydrophobic characteristics. The addition of small amount of TiO2 nanoparticles could greatly decrease the optical bandgap of PS from 4.0 eV in pure PS to less than 3.0 eV in PS-TiO2 nanocomposite. The effects of surface modification and UVC irradiation on the physical properties and the degradation of nanocomposites were investigated.

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Daniel, Sam N., C. I. Anish, G. Sabeena, S. Rajaduraipandian, S. Gandhimathi, G. Annadurai et Rajan M. Jaya. « Synthesis and Characterization of TiO2-CeO2 (TiO2-Ce) Nanocomposite : Testing its Antibacterial Effect ». Research Journal of Chemistry and Environment 25, n^o 10 (25 septembre 2021) : 13–19. http://dx.doi.org/10.25303/2510rjce1319.

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TiO2-CeO2 (TiO2-Ce) nanocomposites were synthesized by sol–gel route using chemical method. The crystalline nanocomposites were obtained after calcination at 600 °C for 6 hours. N2-BET study revealed the huge surface area (0.03 cm2g-1) and pore size (2.28 nm) of TiO2 which decreased after impregnation of Ceria. In the Scanning Electron Microscopy analysis, particles were found to be of spherical shape. The energy dispersive X-ray (EDX) spectrum of TiO2-CeO2 (TiO2-Ce) nanocomposite showed Ti, O and Ce peaks obviously found in the spectra, confirming the presence of cerium and titanium. The agar well diffusion assay is used to confirm the inhibition zone of bacteria. The TiO2-CeO2 (TiO2-Ce) nanocomposite showed the antibacterial activity when tested against the pathogens gram negative bacteria such as Pseudomonas. Further the synthesized nanocomposite was characterized by using X-ray powder diffraction (XRD), Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), Brunauer- Emmett-Teller (BET) method using N2 adsorption– desorption studies, UV–Visible absorption spectroscopy (UV), Fourier transform infrared spectroscopy (FTIR).

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Chakravadhanula, Venkata Sai Kiran, Yogendra Kumar Mishra, Venkata Girish Kotnur, Devesh Kumar Avasthi, Thomas Strunskus, Vladimir Zaporotchenko, Dietmar Fink, Lorenz Kienle et Franz Faupel. « Microstructural and plasmonic modifications in Ag–TiO2 and Au–TiO2 nanocomposites through ion beam irradiation ». Beilstein Journal of Nanotechnology 5 (1 septembre 2014) : 1419–31. http://dx.doi.org/10.3762/bjnano.5.154.

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The development of new fabrication techniques of plasmonic nanocomposites with specific properties is an ongoing issue in the plasmonic and nanophotonics community. In this paper we report detailed investigations on the modifications of the microstructural and plasmonic properties of metal–titania nanocomposite films induced by swift heavy ions. Au–TiO2 and Ag–TiO2 nanocomposite thin films with varying metal volume fractions were deposited by co-sputtering and were subsequently irradiated by 100 MeV Ag8+ ions at various ion fluences. The morphology of these nanocomposite thin films before and after ion beam irradiation has been investigated in detail by transmission electron microscopy studies, which showed interesting changes in the titania matrix. Additionally, interesting modifications in the plasmonic absorption behavior for both Au–TiO2 and Ag–TiO2 nanocomposites were observed, which have been discussed in terms of ion beam induced growth of nanoparticles and structural modifications in the titania matrix.

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Niaz, N. A., A. Shakoor, F. Hussain, M. Iqbal, N. R. Khalid, M. K. Saleem, N. Anwar et J. Ahmad. « Structural and electronic properties of PANI-ZnO-TiO2 nanocomposite ». Journal of Ovonic Research 18, n^o 5 (3 novembre 2022) : 713–22. http://dx.doi.org/10.15251/jor.2022.185.713.

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The nanocomposites of doped Polyaniline (PANI) with ZnO-TiO2 nanoparticles have been prepared by in-situ polymerization method. The structural properties of synthesized PANI and PANI/ZnO-TiO2 were studied by X-ray diffraction (XRD) analysis. XRD pattern show that PANI is intercalated into the layers of ZnO-TiO2 successfully and thus the degree of crystallinity increases due to crystalline nature of ZnO-TiO2. FTIR analysis indicated that there is a strong interaction between ZnO-TiO2 nanoparticles and PANI. Electronic properties (Dielectric and Conductivity) of PANI and PANI/ZnO-TiO2 nanocomposite have been investigated between frequency ranges from 20Hz to 01MHz, higher dielectric constants and dielectric losses of PANI/ZnO-TiO2 nanocomposites were found. As the content of ZnO-TiO2 increased, the dielectric constant and loss also increased. The value of dielectric constant for all samples is very high at low frequency but decreases with increase in frequency. Synthesis of PANI/ZnO-TiO2 nanocomposite materials with a large dielectric constant is promising for charge storage devices applications

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Deshmukh, Sandip M., Sudhir S. Arbuj, Santosh B. Babar, Shoyebmohamad F. Shaikh, Asiya M. Tamboli, Nguyen Tam Nguyen Truong, Chang-Duk Kim, Sanjay M. Khetre, Mohaseen S. Tamboli et Sambhaji R. Bamane. « Environmentally Benign Organic Dye Conversion under UV Light through TiO2-ZnO Nanocomposite ». Metals 11, n^o 11 (6 novembre 2021) : 1787. http://dx.doi.org/10.3390/met11111787.

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In this work, we developed a very simple and novel approach for synthesizing TiO2-ZnO nanocomposites via the urea-assisted thermal decomposition of titanium oxysulphate and zinc acetate at different weight ratios. The synthesized nanocomposite samples were studied by means of HR-TEM, XRD, STEM, UV–Vis DRS, PL and EDS. The observed results demonstrate that the TiO2-ZnO nanocomposite consists of an anatase crystal phase of TiO2 with a crystallite size of 10–15 nm. Combined characterization, including UV–Vis DRS, STEM, EDS and HR-TEM, revealed the successful formation of a heterojunction between TiO2 and ZnO and an improvement in UV spectrum absorption. The photocatalytic activity was explored using MO degradation under ultraviolet light illumination. The results of the optimized TiO2-ZnO nanocomposite show excellent photocatalytic activity and photostability over a number of degradation reaction cycles. In addition, the current approach has immense potential to be used as a proficient method for synthesizing mixed metal oxide nanocomposites.

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Mohaimeed, Ameen alwan. « The Study the Influence of TiO2-Nanoparticles Doped in Polyvinyl Alcohol by Measuring Optical Properties of PVA Films ». Iraqi Journal of Nanotechnology, n^o 3 (14 octobre 2022) : 59–70. http://dx.doi.org/10.47758/ijn.vi3.62.

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It was investigated how titanium dioxide nanoparticles affected the optical properties of polyvinyl alcohol. Polymer nanocomposites (PVA-TiO2) are created via stirring and casting. The results demonstrate that transmittance improves from 75% to 95% while titanium dioxide concentration enhances the absorbance of nanocomposites. Nanocomposite films made of PVA and TiO2 had reflectance values of 12 and 16 percent (weight percent=0.15 and 0.85%).The refractive index and coefficient of extinction rise with increasing density, and optical absorption and photon dispersion in the nanocomposite (PVA-TiO2) also rise as the concentration of titanium dioxide nanoparticles rises. Real dielectric (r) and imaginary dielectric I constants also rise as titanium dioxide nanoparticle concentration does. The results show that when the weight % of (TiO2) nanoparticles increased, the energy gap decreased from 3.32 to 2.23. Additionally, optical conductivity increased with the concentration of (TiO2) NPs. Nanocomposites of PVA and TiO2 are essential for optical applications.

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Kocijan, Martina, Lidija Ćurković, Davor Ljubas, Katarina Mužina, Ivana Bačić, Tina Radošević, Matejka Podlogar et al. « Graphene-Based TiO2 Nanocomposite for Photocatalytic Degradation of Dyes in Aqueous Solution under Solar-Like Radiation ». Applied Sciences 11, n^o 9 (27 avril 2021) : 3966. http://dx.doi.org/10.3390/app11093966.

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This study presents a novel method for the development of TiO2/reduced graphene oxide (rGO) nanocomposites for photocatalytic degradation of dyes in an aqueous solution. The synergistic integration of rGO and TiO2, through the formation of Ti–O–C bonds, offers an interesting opportunity to design photocatalyst nanocomposite materials with the maximum absorption shift to the visible region of the spectra, where photodegradation can be activated not only with UV but also with the visible part of natural solar irradiation. TiO2@rGO nanocomposites with different content of rGO have been self-assembled by the hydrothermal method followed by calcination treatment. The morphological and structural analysis of the synthesized photocatalysts was performed by FTIR, XRD, XPS, UV-Vis DRS, SEM/EDX, and Raman spectroscopy. The effectiveness of the synthesized nanocomposites as photocatalysts was examined through the photodegradation of methylene blue (MB) and rhodamine B (RhB) dye under artificial solar-like radiation. The influence of rGO concentration (5 and 15 wt.%) on TiO2 performance for photodegradation of the different dyes was monitored by UV-Vis spectroscopy. The obtained results showed that the synthesized TiO2@rGO nanocomposites significantly increased the decomposition of RhB and MB compared to the synthesized TiO2 photocatalyst. Furthermore, TiO2@rGO nanocomposite with high contents of rGO (15 wt.%) presented an improved performance in photodegradation of MB (98.1%) and RhB (99.8%) after 120 min of exposition to solar-like radiation. These results could be mainly attributed to the decrease of the bandgap of synthesized TiO2@rGO nanocomposites with the increased contents of rGO. Energy gap (Eg) values of nanocomposites are 2.71 eV and 3.03 eV, when pure TiO2 particles have 3.15 eV. These results show the potential of graphene-based TiO2 nanocomposite to be explored as a highly efficient solar light-driven photocatalyst for water purification.

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Thakur, Sourbh, et Omotayo Arotiba. « Synthesis, characterization and adsorption studies of an acrylic acid-grafted sodium alginate-based TiO2 hydrogel nanocomposite ». Adsorption Science & ; Technology 36, n^o 1-2 (25 avril 2017) : 458–77. http://dx.doi.org/10.1177/0263617417700636.

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Hydrogel nanocomposites were synthesized by solution polymerization of acrylic acid in the presence of sodium alginate biopolymer and TiO2 nanoparticle. TiO2 nanoparticle and N, N-methylene-bis-acrylamide was used as an inorganic and organic crosslinker, respectively. The structure and morphology of the nanocomposites were investigated using X-Ray Diffraction (XRD), Fourier Transform Infra-Red Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET) and thermogravimetric analysis techniques. The nanocomposites hydrogel was used for the adsorption of methyl violet dye from water. The influence of TiO2 nanoparticle, sodium alginate content and grafting on adsorption were studied. The results showed that a pseudo-second-order adsorption kinetic was predominant in the adsorption of methyl violet onto the nanocomposite hydrogel. The experimental equilibrated adsorption capacity of the nanocomposite hydrogel agrees with Langmuir isotherm. Maximum adsorption capacity of 1156.61 mg g−1 and adsorption efficiency of 99.6% towards methyl violet were obtained for the hydrogel nanocomposite.

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Thuy, Nguyen Thi Thu, Do Hoang Tung, Le Hong Manh, Pham Hong Minh et Nguyen The Hien. « Improvement of the Photocatalytic Activity of Au/TiO2 Nanocomposites by Prior Treatment of TiO2 with Microplasma in an NH3 and H2O2 Solution ». J 5, n^o 2 (19 mai 2022) : 277–86. http://dx.doi.org/10.3390/j5020019.

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Plasmonic photocatalytic nanocomposites of TiO2 and Au nanoparticles (NPs) have recently attracted the attention of researchers, who aim to improve the photocatalytic activity of potential TiO2 NPs. In this study, we report photocatalytic activity enhancement for a Au/TiO2 nanocomposite prepared by the plasma–liquid interaction method using an atmospheric microplasma apparatus. The enhanced photocatalytic activity of the prepared Au/TiO2 is demonstrated by the degradation of methylene blue (MB) in water under both ultraviolet (UV) and visible light irradiation. The prior treatment of TiO2 with microplasma in a NH3 and H2O2 solution is found to strongly improve the photocatalytic activity of both the treated TiO2 NPs, as well as the synthesized Au/TiO2 nanocomposite.

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Jastrzębska, Agnieszka Maria, Joanna Karcz, Ewa Karwowska, Alicja Fiedorczuk et Andrzej Olszyna. « Synthesis and Bioactivity of RGO/TiO₂-Noble Metal Nanocomposite Flakes ». Journal of Nano Research 47 (mai 2017) : 33–48. http://dx.doi.org/10.4028/www.scientific.net/jnanor.47.33.

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This study aims to describe the influence of adding graphene oxide to TiO2-noble metal (Me=Ag, Au or Pd) composite nanoparticles on their bioactivity (formation of RGO/TiO2-Me nanocomposite system). The obtained nanocomposite flakes and reference TiO2-Me nanoparticles were characterized using SEM, HRTEM and XPS spectroscopy, N2 sorption analysis and helium pycnometer. The analysis of the antibacterial properties of synthesized nanocomposites revealed a growth inhibiting effect of TiO2-Ag particles on gram positive bacteria such as: Staphylococcus aureus, Sarcina lutea and Bacillus subtilis. In the case of nanocomposite flakes containing RGO the visible changes in bacteriostatic properties were observed, including unexpected reversal of the antimicrobial activity of silver-containing nanoparticles into the stimulation of growth of applied bacterial strains. The stimulation of growth was not observed for TiO2-Au and Pd nanoparticles deposited on the surface of RGO.

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Elderdery, Abozer Y., Abdulaziz H. Alhamidi, Ahmed M. E. Elkhalifa, Maryam M. Althobiti, Nawal Eltayeb Omer, Mahdi H. Alsugoor, Naif Alsuhaymi et al. « Synthesis, Characterization, and Antimicrobial and Antiproliferative Effects of CuO-TiO2-Chitosan-Escin Nanocomposites on Human Leukemic MOLT4 Cells ». Nanomaterials 12, n^o 21 (26 octobre 2022) : 3753. http://dx.doi.org/10.3390/nano12213753.

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Nanocomposites comprised of CuO-TiO2-chitosan-escin, which has adjustable physicochemical properties, provide a solution for therapeutic selectivity in cancer treatment. By controlling the intrinsic signaling primarily through the mitochondrial signaling pathway, we desired nanocomposites with enhanced anticancer activity by containing CuO-TiO2-chitosan-escin. The metal oxides CuO and TiO2, the natural polymer chitosan, and a phytochemical compound escin were combined to form CuO-TiO2-chitosan-escin nanocomposites. The synthesized nanocomposites were confirmed and characterized using FTIR spectroscopy, TEM, and UV-Vis absorption spectroscopy. A human leukemia cell line (MOLT-4) was used to assess the efficacy and selectivity of nanocomposites. Based on a cytotoxicity study, CuO-TiO2-chitosan-escin nanocomposites had inhibition concentrations (IC50) of 13.68, 8.9, and 7.14 µg/mL against human T lymphoblast cells after 24, 48, and 72 h of incubation, respectively. Compared with untreated MOLT-4 cells, CuO-TiO2-chitosan-escin nanocomposite-treated cells significantly increased (p < 0.05) caspase-3, -8, and -9 and decreased the levels of antioxidant enzymes GR, SOD, and GSH. Furthermore, MDA for lipid peroxidase and ROS levels significantly increased (p < 0.05) in the treated cells than in the untreated cells. Remarkably, CuO-TiO2-chitosan-escin nanocomposite-mediated control of cell cycles were mainly achieved through the activation of caspase-3, -8, and -9.

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Kareem, Omar A., Sabri J. Mohameed et Isam M. Ibrahim. « The importance of doping TiO₂ into polypyrrol nanofibers to improve their optical sensitivity ». Journal of Physics : Conference Series 2114, n^o 1 (1 décembre 2021) : 012057. http://dx.doi.org/10.1088/1742-6596/2114/1/012057.

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Abstract In this study Electrochemical polymerization was used to make polypyrrol nanofiber. The in situ chemical oxidative polymerization approach was used to create a nanocomposite of polypyrrole PPy-TiO2. To achieve homogeneous dispersion inside the PPy matrix, the TiO2 was dissolved and ultrasonically dispersed. The surface morphology of polypyrrol and PPy/TiO2 nanocomposites was studied using field emission scanning electron microscopy (FE-SEM), which revealed of a polypyrrol nanofibre network and showed that the TiO2 nanoparticles was well incorporated. The produced PPy/TiO2 nanocomposite was characterized using XRD (X-Ray diffraction) and FT-IR (Fourier Transform Infrared). The formation of TiO2 nanoparticales on a PPy layer matrix was discovered, as well as homogeneous dispersion of TiO2 inside the PPy matrix and considerable interaction between PPy and TiO2. The produced PPy/TiO2 nanocomposite sensors’ response was investigated towards of light-power sensitivity. The PPy/TiO2 synergistic effects improve the light sensitivity qualities of the photodetector. The maximium sensitivity of PPy/TiO2 was around (188 %) at 20% TiO2 concentration at a light power of 30 mW for a laser diode 720 nm, while the rise time and fall time was ≈ 2.5sec.

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Fort, Carmen I., Mihai M. Rusu, Lucian C. Pop, Liviu C. Cotet, Adriana Vulpoi, Monica Baia et Lucian Baia. « Preparation and Characterization of Carbon Xerogel Based Composites for Electrochemical Sensing and Photocatalytic Degradation ». Journal of Nanoscience and Nanotechnology 21, n^o 4 (1 avril 2021) : 2323–33. http://dx.doi.org/10.1166/jnn.2021.18963.

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In order to obtain a multifunctional nanocomposite material-for electrochemical sensors and photocatalytic applications, structures based on Bi, Fe and TiO2 were grown inside carbon xerogel supports (BiFeCX and BiFeCX-TiO2). First, a wet polymer containing Bi and Fe salts was obtained by following a modified resorcinol-formaldehyde based sol–gel route, followed by drying in ambient conditions, and pyrolysis under inert atmosphere. Then, through TiCl4 hydrolysis, TiO2 nanoparticles were deposited on the BiFeCX xerogel leading to BiFeCX-TiO2. The morphological and structural characterization of the investigated nanocomposites consisted in X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and N2 adsorption measurements, revealing porous carbon structures with embedded nanoparticles and the particularities driven by the pyrolysis and TiCl4 treatment. The new modified electrodes based on BiFeCX or BiFeCX-TiO2 nanocomposite materials, kept in a chitosan matrix (Chi) and deposited on a glassy carbon (GC) electrode surface (GC/Chi-BiFeCX or GC/Chi-BiFeCX-TiO2), were obtained and investigated for Pb(II) voltammetric detection and H2O2 amperometric detection. Moreover, the BiFeCX-TiO2 nanocomposite was tested for the photocatalytic degradation of methyl orange. The great potential of BiFeCX nanocomposite material for developing electrochemical sensors, or BiFeCX-TiO2 for sensors application and photocatalytic application was demonstrated.

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Kweinor Tetteh, Emmanuel, et Sudesh Rathilal. « Adsorption and Photocatalytic Mineralization of Bromophenol Blue Dye with TiO2 Modified with Clinoptilolite/Activated Carbon ». Catalysts 11, n^o 1 (23 décembre 2020) : 7. http://dx.doi.org/10.3390/catal11010007.

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This study presents a hybridized photocatalyst with adsorbate as a promising nanocomposite for photoremediation of wastewater. Photocatalytic degradation of bromophenol blue (BPB) in aqueous solution under UV-irradiation of wavelength 400 nm was carried out with TiO2 doped with activated carbon (A) and clinoptilolite (Z) via the co-precipitation technique. The physiochemical properties of the nanocomposite (A–TiO2 and Z–TiO2) and TiO2 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared (FTIR) spectroscopy. Results of the nanocomposite (A–TiO2 and Z–TiO2) efficiency was compared to that with the TiO2, which demonstrated their adsorption and synergistic effect for the removal of chemical oxygen demand (COD) and color from the wastewater. At an optimal load of 4 g, the photocatalytic degradation activity (Z–TiO2 > A–TiO2 > TiO2) was found favorably by the second-order kinetic model. Consequently, the Langmuir adsorption isotherms favored the nanocomposites (Z–TiO2 > A–TiO2), whereas that of the TiO2 fitted very well on the Freundlich isotherm approach. Z–TiO2 evidently exhibited a high photocatalytic efficacy of decomposition over 80% of BPB (COD) at reaction rate constant (k) and coefficient of determination (R2) values of 5.63 × 10−4 min−1 and 0.989, respectively.

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Che Ramli, Zatil Amali, Wan Nor Roslam Wan Isahak, Mohd Ambar Yarmo et Nilofar Asim. « Investigation of Photocatalytic Activity of TiO₂-PANi Nanocomposites ». Applied Mechanics and Materials 699 (novembre 2014) : 53–58. http://dx.doi.org/10.4028/www.scientific.net/amm.699.53.

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In this paper the photocatalytic activity of TiO2-PANi nanocomposites prepared using two differentIn-situpolymerization methods have been investigated. The same pressure, temperature, precursors, mole ratio, and solvent have been employed for preparation of nanocomposites. The synthesized nanocomposites were characterized by FESEM, XRD and FTIR. Results revealed the successful preparation of TiO2- PANI nanocomposites. TiO2-PANi nanocomposite synthesized using method 2 showed very well dispersed TiO2nanoparticles on the surface of PANi. There is no agglomeration of TiO2nanoparticles in PANi matrix. The photocatalytic activities of nanocomposites were evaluated by using photo degradation of Methylene Blue (MB) in aqueous solution under UV irradiation. These nanocomposites exhibit much higher photocatalytic activity compared with TiO2.

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Pradipta, Adya Rizky, et Aslan Irunsah. « Synthesis of Modified TiO₂ Nanocomposite using Fe₃O₄ and Nickel as Photocatalyst in Reduction of Silver Ions ». Indonesian Journal of Chemical Studies 1, n^o 1 (10 juin 2022) : 8–12. http://dx.doi.org/10.55749/ijcs.v1i1.7.

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The use of TiO2 nanocomposite modified with Fe3O4 dan Ni dopping for silver ion photoreduction has been successfully carried out. In this study, nanocomposites were fabricated through the sol-gel technique. Structure, optical, and magnetic properties were analyzed using XRD, DRUV-Vis, FTIR, and VSM analysis. The XRD pattern revealed the anatase phase of TiO2 and the iron oxide formed was Fe3O4. UV-Vis spectroscopy showed the formation of absorption in the visible region in the presence of Ni doping. The nanocomposite had magnetic properties of 12.6 emu/g with paramagnetic type. TiO2 nanoparticles presented the percentage reduction of Ag ions with UV and Visible light of 82.65% and 21.43%, respectively, while Fe3O4/ TiO2-Ni with UV and Visible light were 80.93% and 90.72%, respectively. Ni-dopped nanocomposites had shown high photocatalytic activity under both UV and Visible irradiation.

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Hajipour, Pejman, Abbas Bahrami, Maryam Yazdan Mehr, Willem Dirk van Driel et Kouchi Zhang. « Facile Synthesis of Ag Nanowire/TiO2 and Ag Nanowire/TiO2/GO Nanocomposites for Photocatalytic Degradation of Rhodamine B ». Materials 14, n^o 4 (6 février 2021) : 763. http://dx.doi.org/10.3390/ma14040763.

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This paper investigates the photocatalytic characteristics of Ag nanowire (AgNW)/TiO2 and AgNW/TiO2/graphene oxide (GO) nanocomposites. Samples were synthesized by the direct coating of TiO2 particles on the surface of silver nanowires. As-prepared AgNW/TiO2 and AgNW/TiO2/GO nanocomposites were characterized by electron microscopy, X-ray diffraction, UV/visible absorption spectroscopy, and infrared spectroscopy. Transmission electron microscope (TEM) images confirmed the successful deposition of TiO2 nanoparticles on the surface of AgNWs. The photocatalytic activity of synthesized nanocomposites was evaluated using Rhodamine B (RhB) in an aqueous solution as the model organic dye. Results showed that synthesized AgNW/TiO2/GO nanocomposite has superior photocatalytic activities when it comes to the decomposition of RhB.

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Ni, Xia, Ji Ma, Jiangong Li, Juanjuan Huang, Dongmao Jiao et Zhibin Lu. « Structure and Microwave Characteristics of Co/TiO2 Nanocomposites Prepared by Ball Milling ». Journal of Nanoscience and Nanotechnology 8, n^o 9 (1 septembre 2008) : 4470–76. http://dx.doi.org/10.1166/jnn.2008.293.

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Co/TiO2 nanocomposites were fabricated via direct ball milling. The structure and microwave characteristics of the Co/TiO2 nanocomposites were investigated. The results show that the hcp and fcc Co phases coexist in the nanocomposites for a long milling duration. The accumulation of the stacking faults in Co and the increase of the Co/TiO2 interfaces were detected by nuclear magnetic resonance. The measured relative complex permittivity of the Co/TiO2 nanocomposite-paraffin wax mixture indicates that a high electrical resistivity and a dielectric loss exist in the Co/TiO2 nanocomposites. The dielectric loss mainly results from the polarisation of the metal/insulator interfaces. The imaginary part of the relative complex permeability of the mixture exhibits a broad resonance peak at 5.1 GHz which originates from the natural resonance in Co. The broadening of the resonance peak can be attributed to the fluctuating magnetocrystalline anisotropy at the stacking faults and interfaces regions. The calculated reflection loss curves show that the minimal reflection loss value of the Co/TiO2 nanocomposite-paraffin wax mixture can reach −32 dB at 4.0 GHz with a 3 mm sample thickness. The improved microwave absorption properties may result from the high electrical resistivity, dielectric loss and natural resonance.

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Zayed, Mohamed, Salsbeel Samy, Mohamed Shaban, Abeer S. Altowyan, Hany Hamdy et Ashour M. Ahmed. « Fabrication of TiO2/NiO p-n Nanocomposite for Enhancement Dye Photodegradation under Solar Radiation ». Nanomaterials 12, n^o 6 (17 mars 2022) : 989. http://dx.doi.org/10.3390/nano12060989.

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A p-n nanocomposite based on TiO2 nanotubes (NTs) and NiO nanoparticles (NPs) was designed and optimized in this study to improve the photocatalytic performance of methylene blue (MB). The hydrothermal technique has been used to produce TiO2/NiO nanocomposites with different NiO NPs weight ratios; 1TiO2:1NiO, 1TiO2:2NiO, and 1TiO2:3NiO. The crystal phase, chemical composition, optical properties, and morphology of TiO2/NiO were explored by various techniques. TiO2 NTs have a monoclinic structure, while NiO NPs have a cubic structure, according to the structural study. The bandgap of TiO2 NTs was reduced from 3.54 eV to 2.69 eV after controlling the NiO NPs weight ratio. The TiO2/2NiO nanocomposite showed the best photodegradation efficiency. Within 45 min of solar light irradiation, the efficiency of MB dye degradation using TiO2/2NiO hits 99.5% versus 73% using pure TiO2 NTs. Furthermore, the catalytic photodegradation efficiency did not deteriorate significantly even after five reusability cycles, intimating the high stability of the TiO2/2NiO nanocomposite. This suggests that the loading of NiO NPs into TiO2 NTs lowers the recombination of photo-produced electron/hole pairs and enlarged solar spectral response range, which results in improved photocatalytic activity. The mechanism of charge transfer in the TiO2/NiO and kinetic models were discussed for the photodegradation of MB.

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Gilja, Vanja, Zvonimir Katančić, Ljerka Kratofil Krehula, Vilko Mandić et Zlata Hrnjak-Murgić. « Efficiency of TiO2 catalyst supported by modified waste fly ash during photodegradation of RR45 dye ». Science and Engineering of Composite Materials 26, n^o 1 (28 janvier 2019) : 292–300. http://dx.doi.org/10.1515/secm-2019-0017.

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AbstractThe waste fly ash (FA) material was subjected to chemical treatment with HCl at elevated temperature for a different time to modify its porosity. Modified FA particles with highest surface area and pore volume were further used as a support for TiO2 catalyst during FA/TiO2 nanocomposite preparation. The nanocomposite photocatalysts were obtained by in situ sol–gel synthesis of titanium dioxide in the presence of FA particles. To perform accurate characterization of modified FA and FA/TiO2 nanocomposite photocatalysts, gas adsorption-desorption analysis, X-ray diffraction, scanning electron microscopy, UV/Vis and Infrared spectroscopy were used. Efficiency evaluation of the synthesized FA/TiO2 nanocomposites was performed by following the removal of Reactive Red 45 (RR45) azo dye during photocatalytic treatment under the UV-A irradiation. Photocatalysis has been carried out up to five cycles with the same catalysts to investigate their stability and the possible reuse. The FA/TiO2 photocatalyst showed very good photocatalytic activity and stability even after the fifth cycles. The obtained results show that successfully modified waste fly ash can be used as very good TiO2 support.

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Golobostanfard, Mohammad Reza, Reza Ebrahimifard et Hossein Abdizadeh. « Synthesis of TiO₂/Zno Core/Shell Type Nanocomposite via Sol-Gel Method ». Key Engineering Materials 471-472 (février 2011) : 993–98. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.993.

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TiO2/ZnO Nanocomposite powders with different Zn/Ti ratios were synthesized via sol-gel method. The as prepared and calcined Titania nanopowders were added to the ZnO sols. Also the as prepared and calcined ZnO nanopowders were separately added to the TiO2 sols. However, in the latter case, the nanocomposite never formed due to the high acidity of the sols. After gelation, the powders were dried and calcined at 500°C for 1h. The phase composition, structure, morphology and optoelectrical properties of the powders were characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV-Vis photospectroscopy and photoluminescence spectroscopy (PL). The XRD patterns confirm the presence of TiO2 and ZnO crystalline phases in the TiO2 particles/ZnO sol samples. The FESEM micrographs show that TiO2/ZnO nanocomposites heat treated at 500°C were formed with average diameter of about 250nm with 50nm ZnO particles on clusters of 40nm TiO2 particles. It was found that the optoelectronic properties of the nanocomposites were improved according to the UV-Vis and photoluminescence spectroscopy.

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Mansouriieh, Nafiseh, Mahmoud Reza Sohrabi, Rogayyeh Pouramir Vajargah et Hasan Roudbaraki. « Photocatalytic degradation of Direct yellow 86 diazo dye using sulfanilic acid-modified TiO2 in aqueous suspensions ». Water Science and Technology 76, n^o 8 (19 juin 2017) : 1992–2002. http://dx.doi.org/10.2166/wst.2017.339.

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This study synthesized sulfanilic acid (SA)-modified TiO2 nanocomposites and used them as an effective photocatalyst for Direct yellow 86 diazo dye removal from aqueous solution. This novel nanocomposite (SA/TiO2) was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy and X-ray diffraction. The results showed the formation of SA/TiO2 nanocatalyst. The photocatalytic activity of the modified photocatalyst was examined by degradation of Direct yellow 86 (GE) under UV and visible light. The effects of five parameters, the concentration of GE, dosage of SA/TiO2 nanocomposite, UV light irradiation intensity, pH and visible light illumination, on the removal of GE using SA/TiO2 nanocomposite were studied. The highest GE removal was determined at pH of 9, nanocomposite dosage of 0.15 g/l and initial GE concentration of 50 mg/l at the constant temperature of 25 °C. However, the results showed that the GE removal rate increased as the UV light intensity increased. In addition, an enhancement in the photodegradation rate was observed with visible light illumination. The adsorption trends of GE at various initial concentrations followed the Langmuir isotherm model.

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Hafizah, N. N., Mohamad Hafiz Mamat, Mohd Hanafiah Abidin, Che Mohd Som Said et Mohamad Rusop. « Bonding and Mechanical Properties of PMMA/TiO₂ Nanocomposites ». Advanced Materials Research 832 (novembre 2013) : 700–705. http://dx.doi.org/10.4028/www.scientific.net/amr.832.700.

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In this study, the polymer nanocomposites was prepared by mixing the TiO2 nanofiller into the polymer PMMA matrix using the sonication and solution casting technique. The PMMA/TiO2 nanocomposite was prepared at different amount of TiO2 in PMMA and was measured using FTIR, EDX and DMTA. The DMTA results show that the higher amount of TiO2 in PMMA will contribute to the increase of the storage modulus of the nanocomposites. But, the too high amount of the filler will limit the properties of the nanocomposites. The FTIR and EDX analysis also are discussed in this paper.

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Lyly Nyl, Ismail, Ahmad Fairoz Aziz, Zulkefle Habibah, Musa Mohamed Zaihidi, Mohd Hanapiah Abdullah, Sukreen Hana Herman, Uzer Mohd Noor et Mohamad Rusop. « Optical Properties and Surface Morphology of PMMA : TiO₂ Nanocomposite Thin Films ». Advanced Materials Research 364 (octobre 2011) : 105–9. http://dx.doi.org/10.4028/www.scientific.net/amr.364.105.

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Sol-gel spin coated PMMA:TiO2 nanocomposite thin films on glass substrates were studied by comparing two types of the sol-gel solutions. Two types of PMMA:TiO2 nanocomposite sol-gel solutions were prepared; one using Degusa (P25), and the other one is using self-prepared TiO2 powder. The self-prepared nanosized TiO2 powder is obtained by drying the TiO2 sol-gel using solvothermal method followed by grinding the TiO2 crystal using ball miller. Triton-X was used as surfactant to stabilize the composite. Besides comparing the nanocomposite solution, we also studied the effect of the thin films thickness on the optical properties and their surface morphology. The optical properties and surface morphology were measured with UV-VIS spectrometer and atomic force microscopy (AFM). The result showed that nanocomposite PMMA with self-prepared TiO2 give high optical transparency than that of with Degusa (P25). The results also indicate that as the thickness is increased the optical transparency are decreased. Both AFM images showed that the agglomerations of TiO2 particles occurred on top of the thin film and the surface roughness increased when the thickness is increased. AFM results show that nanocomposited PMMA with P25 has high agglomeration particles compared to the other one.

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Polsterova, Helena. « Dielectric Properties of Nanocomposites Based on Epoxy Resin ». ECS Transactions 105, n^o 1 (30 novembre 2021) : 461–66. http://dx.doi.org/10.1149/10501.0461ecst.

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Nanocomposites are subject of research in many fields of science. Electrical technology focused on the study of electrical properties of nanocomposites including breakdown strength, relative permittivity, resistivity and other. This paper describes the results of measurement of electrical parameters of a nanocomposite at various temperatures. The nanocomposite matrix was casting epoxy resin and nanoparticles were made of TiO2 powder at different concentrations.

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Siong, Valerie Ling Er, Chin Wei Lai, Joon Ching Juan, Kian Mun Lee, Bey Fen Leo et Cheng Seong Khe. « One-step Solvothermal Synthesis of rGO/TiO2 Nanocomposite for Efficient Solar Photocatalytic Degradation of Methylene Blue Dye ». Current Nanoscience 15, n^o 2 (14 décembre 2018) : 157–62. http://dx.doi.org/10.2174/1573413714666180426092927.

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Background: The discharge of effluents from the textile and dyeing industries has been a worldwide concern. Although reduced graphene oxide/titanium dioxide (rGO/TiO2) nanocomposite is a potential candidate for wastewater treatment, the influence of graphene oxide (GO) content on its physico-chemical characteristics and its subsequent photocatalytic capabilities in degrading the organic contaminants has not been well established. Objective: The primary objective of this study was to assess the use of rGO/TiO2 nanocomposites with various GO contents for the removal of toxic methylene blue (MB) dye from aqueous solution. Method: In the present study, rGO/TiO2 nanocomposites were fabricated using various GO contents through a one-step solvothermal method. The effect of GO content on the nanocomposite formation was investigated by using field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. The resulting nanocomposites were evaluated against MB degradation under artificial solar light illumination. Results: Based on the photocatalytic results, the highest removal percentage of MB was achieved by 0.15rGO/TiO2, which was about 1.7 times higher than that of 0.01rGO/TiO2. The enhanced removal efficiency of MB by the nanocomposite with the highest GO content (0.15 g) was attributed to the increased active adsorption sites, which greatly promoted the π- π interaction between the aromatic rings of MB dye and the graphitic skeleton of rGO, as well as the electrostatic interaction between the cationic center of MB molecules and the residual oxygen functionalities of rGO.

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Ai, Manqing, Wenli Qin, Tian Xia, Ying Ye, Xuegang Chen et Pingping Zhang. « Photocatalytic Degradation of 2,4-Dichlorophenol by TiO2 Intercalated Talc Nanocomposite ». International Journal of Photoenergy 2019 (3 mars 2019) : 1–11. http://dx.doi.org/10.1155/2019/1540271.

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Novel nanocomposites have been prepared by intercalating TiO2 nanoparticles into talc. The nanocomposites have been verified by X-ray diffraction (XRD) from the appearance of a characteristic diffraction peak of TiO2. Thermal behavior of the prepared samples is examined by thermogravimetric analyzer (TGA), scanning electron microscope (SEM), and energy dispersive spectrometer (EDS), which have shown no TiO2 particles on the surface of the talc. The TiO2 particles are found in the layers of talc by transmission electron microscopy (TEM) and the Brunauer-Emmett-Teller (BET) method, which have shown the increase of specific surface areas and total pore volumes and the decline of average pore diameters. As the strong adsorption ability of talc can intensify the power of photon absorption and capture-recombination carriers, more than 99.5% of 2,4-dichlorophenol can be degraded in 1 h by the nanocomposite under an ultraviolet lamp in neutral solution and room temperature after reaching adsorption equilibrium, and the result of adsorbance is in accord with the first-order kinetic. The degradation rate was maintained at about 99% after 20 times. Therefore, the prepared talc/TiO2 nanocomposite is an efficient, stable, and recyclable material for wastewater treatment.

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Alhagri, Ibrahim A., Talal F. Qahtan, Mohammed O. Farea, Ahmed N. Al-Hakimi, Sadeq M. Al-Hazmy, Saeed El-Sayed Saeed et Abuzar EAE Albadri. « Enhanced Structural, Optical Properties and Antibacterial Activity of PEO/CMC Doped TiO2 NPs for Food Packaging Applications ». Polymers 15, n^o 2 (11 janvier 2023) : 384. http://dx.doi.org/10.3390/polym15020384.

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In this article, the synthesis, optical, and electrical properties of composites consisting of polyethylene oxide (PEO), carboxymethyl cellulose (CMC), and titanium dioxide nanoparticles are examined. Flexible nanocomposite samples comprising PEO, CMC, and TiO2 nanoparticles were produced swiftly via using the cast synthesis method. In addition, XRD and FT-IR analysis were performed in order to analyze the structures of the prepared samples. Our results demonstrate the PEO/CMC blend’s effectiveness in interacting with TiO2 nanoparticles. The optical properties of the PEO/CMC and nanocomposite samples, such as the energy band gap, were studied using the UV/Vis optical absorbance. It was found that as TiO2 NP weight fraction increases, the energy gap narrows. Moreover, TiO2 nanoparticles with an average size of 16 nm were formed in spherical and rod shapes, according to a TEM image. The SEM images demonstrate how the distribution of TiO2 NPs increased upon the surfaces of the prepared films. The antibacterial activity in the nanocomposites was shown to be enhanced by the TiO2 NP concentrations. Finally, we proposed that PEO/CMC-0.8 wt. % TiO2 nanocomposites with enhanced optical, electrical, and dielectric properties should be used in electrochemical devices.

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Tushavina, O. V., G. I. Kriven et Thant Zin Hein. « Study of Thermophysical Properties of Polymer Materials Enhanced by Nanosized Particles ». International Journal of Circuits, Systems and Signal Processing 15 (14 septembre 2021) : 1436–42. http://dx.doi.org/10.46300/9106.2021.15.155.

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In this work, the object of study is an epoxy nanocomposite based on TiO2 nanoparticles and epoxy resin, and the subject is the preparation and physical and mechanical properties of TiO2/epoxy nanocomposites. The characteristics of the properties and methods of synthesis of the initial components for the synthesis of epoxy nanocomposites - epoxy resins and nanoparticles of titanium dioxide are given, and data on epoxy nanocomposites based on nanoparticles of titanium dioxide are presented. It was found that the addition of TiO2 to the epoxy matrix reduces the coefficient of friction and significantly increases the wear resistance of such nanocomposites.

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Liu, Fang, Cheng Qian, Li Xu, Xiaofei Xie, Tingting Wang, Jiancheng Li, Ruixue Tian et al. « Biofabrication of TiO2 Nanoparticles and Their Effect on the Mechanical and Rheological Properties and UV-Absorption of the Rapid Prototyping Epoxy-Based Composites for Dental Photosensitive Resins ». Journal of Nanoelectronics and Optoelectronics 14, n^o 12 (1 décembre 2019) : 1771–75. http://dx.doi.org/10.1166/jno.2019.2673.

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In this investigation we have showed the synthesis of TiO2-NPs using Rosa hybrida leaf extract and studied using various spectroscopic and microscopic techniques. The as prepared photosensitive TiO2-NPs based nanocomposite have been used, to alter the epoxy-based light-sensitive resin, by carrying the goal of achieving express prototyping dental resources, where TiO2-NPs acted as reinforcing fillers. We enhanced the hardness of the nanocomposite material using TiO2-NPs filler, which plays as a significant parameter in the technique of dental impression. Further, the prepared composites are also studied about the light absorption, mechanical properties and viscosity. It is found the enhanced mechanical properties of the nanocomposites indicating the potential of TiO2-NPs for stereolithography and digital light processing that can be useful for preparation of the high dimensional accuracy dental model.

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Thomas*, Anitha, M. Shailaja Raj et Jagirdar Venkataramana. « TiO2 : ZnO nanocomposites in treatment of dental plaques ». International Journal of Bioassays 5, n^o 10 (1 octobre 2016) : 4977. http://dx.doi.org/10.21746/ijbio.2016.10.0012.

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Dental caries is a major concern effecting most of the individuals today. Statistics show that 69% of adults aged 35 to 44 years have lost permanent tooth due to accident, gum disease failed root canal or tooth decay. Dental plaque is a general term for the diverse microbial community found on tooth surface, embedded in matrix of polymers of bacteria. Nanoparticles considered being of a size not greater than 100 nm have unique properties to combat infection. Nanocomposite is a matrix to which nanoparticles have been added to improve a particular property of the material. The present study deals with the antimicrobial studies of nanocomposite preparations of Titanium dioxide and Zinc oxide. Titanium dioxide and Zinc oxide nanocomposites are found to be effective in inhibiting the growth of bacteria. The present work is to prepare different proportions of nanocomposites of these oxides and find out if the effectivity is more when compared to using the nanoparticle alone. Some nanocomposite materials have been shown to be 1000 times tougher than the bulk component materials. The study carried out shows that the antimicrobial activity of nanocomposites is more effective than the nanoparticle alone providing best alternative to dental implant surgery.

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Guo, Yanni, Deliang He, Sanbao Xia, Xin Xie, Xiang Gao et Quan Zhang. « Preparation of a Novel Nanocomposite of Polyaniline Core Decorated with Anatase-TiO2Nanoparticles in Ionic Liquid/Water Microemulsion ». Journal of Nanomaterials 2012 (2012) : 1–7. http://dx.doi.org/10.1155/2012/202794.

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Polyaniline core decorated with TiO2(PANI-TiO2) nanocomposite particles was successfully synthesized in ionic liquid/water (IL/water) microemulsion in the presence of anatase TiO2nanoparticles. The TiO2nanoparticles had been dispersed beforehand in OP-10 andn-butanol to weaken the strong particles agglomeration of TiO2. The PANI-TiO2nanocomposites were characterized by fourier transform infrared spectroscopy (FTIR), ultraviolet visible spectroscopy (UV-Vis), scanning electron microscopy (SEM), and transmission electron microscope (TEM), and their electrochemical behavior was estimated by the electrochemical workstation. SEM micrographs showed that the nanocomposites exhibited spherical morphology with particle sizes about 70 nm. The TEM result showed that the PANI-TiO2nanocomposites had a novel structure and that nanocrystalline TiO2deposited onto the surface of PANI, which was different from the reported structure of TiO2-PANI nanocomposites. Both FTIR and UV-Vis spectra indicate that polyaniline and nano-TiO2particles are not simply blended or mixed up. A possible reaction mechanism for this nanocomposite preparation is suggested and analyzed.

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Kuvarega, Alex T., et Bhekie B. Mamba. « Double Walled Carbon Nanotube/TiO2 Nanocomposites for Photocatalytic Dye Degradation ». Journal of Nanomaterials 2016 (2016) : 1–9. http://dx.doi.org/10.1155/2016/3746861.

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Double walled carbon nanotube (DWCNT)/N,Pd codoped TiO2 nanocomposites were prepared by a modified sol-gel method and characterised using FTIR, Raman spectroscopy, TGA, DRUV-Vis, XRD, SEM, and TEM analyses. TEM images showed unique pearl-bead-necklace structured morphologies at higher DWCNT ratios. The nanocomposite materials showed characteristic anatase TiO2 Raman bands in addition to the carbon nanotube D and G bands. Red shifts in the UV-Vis absorption edge were observed at low DWCNT percentages. The photocatalytic activity of DWCNT/N,Pd TiO2 nanocomposite was evaluated by the photocatalytic degradation of eosin yellow under simulated solar light irradiation and the 2% DWCNT/N,Pd TiO2 nanocomposite showed the highest photoactivity while the 20% DWCNT/N,Pd TiO2 hybrid was the least efficient. The photocatalytic enhancement was attributed to the synergistic effects of the supporting and electron channeling role of the DWCNTs as well as the electron trapping effects of the platinum group metal. These phenomena favour the separation of the photogenerated electron-hole pairs, reducing their recombination rate, which consequently lead to significantly enhanced photoactivity.

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Martins, Pedro M., Joana M. Ribeiro, Sara Teixeira, Dmitri Y. Petrovykh, Gianaurelio Cuniberti, Luciana Pereira et Senentxu Lanceros-Méndez. « Photocatalytic Microporous Membrane against the Increasing Problem of Water Emerging Pollutants ». Materials 12, n^o 10 (21 mai 2019) : 1649. http://dx.doi.org/10.3390/ma12101649.

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Emerging pollutants are an essential class of recalcitrant contaminants that are not eliminated from water after conventional treatment. Here, a photocatalytic microporous membrane based on polyvinylidene difluoride-co-trifluoroethylene (PVDF−TrFE) with immobilised TiO2 nanoparticles, prepared by solvent casting, was tested against representative emerging pollutants. The structure and composition of these polymeric membranes were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, porosimetry, and contact angle goniometry. The nanocomposites exhibited a porous structure with a uniform distribution of TiO2 nanoparticles. The addition of TiO2 did not change the structure of the polymeric matrix; however, it increased the wettability of the nanocomposite. The nanocomposites degraded 99% of methylene blue (MB), 95% of ciprofloxacin (CIP), and 48% of ibuprofen (IBP). The microporous nanocomposite exhibited no photocatalytic efficiency loss after four use cycles, corresponding to 20 h of UV irradiation. The reusability of this system confirms the promising nature of polymer nanocomposites as the basis for cost-effective and scalable treatments of emerging pollutants.

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Subaer, Subaer, Hamzah Fansuri, Abdul Haris, Misdayanti, Resky Irfanita, Imam Ramadhan, Yulprista Putri et Agung Setiawan. « Pervaporation Membranes for Seawater Desalination Based on Geo–rGO–TiO2 Nanocomposites. Part 1 : Microstructure Properties ». Membranes 11, n^o 12 (8 décembre 2021) : 966. http://dx.doi.org/10.3390/membranes11120966.

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This is the first of two papers about the synthesis and microstructure properties of the Geo–rGO–TiO2 ternary nanocomposite, which was designed to suit the criteria of a pervaporation membrane for seawater desalination. The performance and capability of Geo–rGO–TiO2 as a seawater desalination pervaporation membrane are described in the second paper. A geopolymer made from alkali-activated metakaolin was utilized as a binder for the rGO-TiO2 nanocomposite. A modified Hummer’s method was used to synthesize graphene oxide (GO), and a hydrothermal procedure on GO produced reduced graphene oxide (rGO). The adopted approach yielded high-quality GO and rGO, based on Raman spectra results. The nanolayered structure of GO and rGO is revealed by Transmission Electron Microscopy (TEM) images. The Geo–rGO–TiO2 ternary nanocomposite was created by dispersing rGO nanosheets and TiO2 nanoparticles into geopolymer paste and stirring it for several minutes. The mixture was then cured in a sealed mold at 70 °C for one hour. After being demolded, the materials were kept for 28 days before being characterized. Fourier Transform Infrared (FTIR) and X-ray Diffraction (XRD) measurements revealed that the geopolymer matrix efficiently bonded the rGO and TiO2, creating nanocomposites. Scanning Electron Microscopy (SEM) coupled with Energy Dispersive Spectroscopy (EDS) was used to examine the morphology of the outer layer and cross-sections of nanocomposites, and the results displayed that rGO were stacked on the surface as well as in the bulk of the geopolymer and will potentially function as nanochannels with a width of around 0.36 nm, while TiO2 NPs covered the majority of the geopolymer matrix, assisting in anti-biofouling of the membranes. The pores structure of the Geo–rGO–TiO2 were classified as micro–meso pores using the Brunauer–Emmet–Teller (BET) method, indicating that they are appropriate for use as pervaporation membranes. The mechanical strength of the membranes was found to be adequate to withstand high water pressure during the pervaporation process. The addition of rGO and TiO2 NPs was found to improve the hyropobicity of the Geo–rGO–TiO2 nanocomposite, preventing excessive seawater penetration into the membrane during the pervaporation process. The results of this study elucidate that the Geo–rGO–TiO2 nanocomposite has a lot of potential for application as a pervaporation membrane for seawater desalination because all of the initial components are widely available and inexpensive.

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Utomo, Arya Dwi Cahyo, et Muh Nur Khoiru Wihadi. « Preparation of ZnO/TiO2 Nanocomposite Sensitized Mangosteen Rind (Garcinia mangostana L) Dye for Light Harvesting Efficiency in Solar Cell ». Indo. J. Chem. Res. 10, n^o 2 (29 septembre 2022) : 68–73. http://dx.doi.org/10.30598//ijcr.2022.10-ary.

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The preparation of ZnO/TiO2 nanocomposite is done using the sol-gel method for light harvesting in dye-sensitized solar cell (DSSC). The titanium dioxide (TiO2) compound was added with different ratios to the ZnO matrix and measured its effect on solar cells based on the DSSC system. The powder X-ray diffractions of nanocomposite revealed anatase (TiO2) and wurtzite (ZnO) phases have the highest peak at 25.26° and 36.97°, respectively. The energy gap was observed by diffuse reflectance-ultra violet (DR-UV) spectroscopy and it revealed that the optimum performance of nanocomposite was 3.16 eV for the 1:2 ratio. The optimum power efficiency was 2.4% with 3.6 cm2 active area, Voc= 788 mV and Isc=3.39 mA, respectively. The scanning electron microscope-energy dispersive X-ray (SEM-EDX) demonstrated the diversity of surface morphology depends on the ratio of TiO2 in the nanocomposite. This shows the addition of TiO2 to the ZnO matrix influenced the structure of the nanocomposite, which can be applied as DSSC electrodes.

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Rajakani, P., et C. Vedhi. « Comparative Study : Synthesis, Characterization, and ORR Activity of Pot and TiO₂-Pot Nanocomposites ». ECS Transactions 107, n^o 1 (24 avril 2022) : 3945–52. http://dx.doi.org/10.1149/10701.3945ecst.

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o-toluidine was polymerized with the incorporation of different amount of titanium dioxide (TiO2) by chemical oxidation method using potassium perdisulphate as oxidizing agent. Comparative studies were carried out with different nanocomposites of varying compositions of TiO2/PoT against poly-o-toluidine (PoT). The resulting poly-o-toluidine – TiO2 nanocomposites (PoTTNCs) were characterized by UV–Vis and FTIR spectral studies. TiO2 has a deep influence in the crystallinity of PoT chains order in nanocomposite structure as observed in the XRD pattern. Electrochemical characterization studies were carried out to compare the improved performance of varied compositions of TiO2/PoT with respect to PoT in different atmospheres.

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Kalnaowakul, Phuri, Tonghathai Phairatana et Aphichart Rodchanarowan. « Photocatalytic Comparative Study of TiO₂, ZnO, Ag-G-ZnO and Ag-G-TiO₂ Nanocomposite Films ». Key Engineering Materials 751 (août 2017) : 825–30. http://dx.doi.org/10.4028/www.scientific.net/kem.751.825.

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In this study, the photocatalytic properties and morphology of TiO2, ZnO, Ag-graphene-zinc oxide (Ag-G-ZnO) and Ag-graphene-titanium dioxide (Ag-G-TiO2) nanocomposite were compared. The Ag-G-ZnO and Ag-G-TiO2 nanocomposite were successfully prepared by thermal decomposition of colloidal solution. These prepared composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy and photocatalytic activities. The results from XRD patterns show that Ag-G-TiO2 composites and the Ag-G-ZnO nanocomposites were in the form of fcc and hcp crystal structure, respectively. The SEM images show that at calcination of 500 °C for 3 h, the composite thin film of Ag-G-ZnO and Ag-G-TiO2 were homogenous. In the case of the photocatalytic experiments using methylene blue dye (MB) under UV irradiation, the order of the photocatalytic activities from high to low performances are Ag-G-ZnO, Ag-G-TiO2, ZnO and TiO2, respectively.

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GHASEMI, FATEMEH, SALIMEH KIMIAGAR, MOZHGAN SHAHBAZI et HOSSEIN VOJOUDI. « REMOVAL ENHANCEMENT OF BASIC BLUE 41 BY RGO–TiO2 NANOCOMPOSITE SYNTHESIZED USING PULSED LASER ». Surface Review and Letters 25, n^o 01 (janvier 2018) : 1850041. http://dx.doi.org/10.1142/s0218625x18500415.

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Graphene oxide (GO) and GO-TiO2 nanocomposite was produced then reduced under pulse laser irradiation (RGO–TiO[Formula: see text]. Basic blue 41 (bb41) dye was removed from aqueous solutions by using RGO–TiO2 nanocomposites. The UV–Vis absorption and FTIR analysis were utilized to confirm the reduction of GO-TiO2 to RGO–TiO2. The results showed complete reduction of GO. X-ray diffraction (XRD), Raman spectra and scanning electron microscopy (SEM) analysis were applied to approve the RGO–TiO2 nanocomposite structure. The effect of pH on the bb41 removal by RGO–TiO2 was studied varying the pH from 1 to 11. The optimum pH and adsorbent dosage were found to be 9 and 0.2[Formula: see text]g/L with 98% efficiency, respectively. The calculated coefficients demonstrated that the Langmuir model was fixed to the experimental data. The results indicated that RGO–TiO2 could be engaged as an exceptional sorbent to remove bb41 dye which is in aqueous solution.

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Worathanakul, Patcharin, Jingkun Jiang, Pratim Biswas et Paisan Kongkachuichay. « Quench-Ring Assisted Flame Synthesis of SiO2-TiO2 Nanostructured Composite ». Journal of Nanoscience and Nanotechnology 8, n^o 12 (1 décembre 2008) : 6253–59. http://dx.doi.org/10.1166/jnn.2008.18379.

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A flame aerosol reactor (FLAR) was used to synthesize SiO2-based nanocomposite materials of SiO2-TiO2 in different precursor molar ratios and quench ring positions. Processing conditions were determined that resulted in formation of different crystal phases at different precursor concentration molar ratios. The results showed that the addition of SiO2 inhibited TiO2 phase transformation from anatase to rutile. The different morphology of SiO2-TiO2 nanocomposite was primarily the result of changing the quench ring position. Quenching can stop the growth kinetics, and this was obtained by locating the quench ring at different positions in the particle formation process. At a lower position, a binary mixture of SiO2-TiO2 was obtained in a core–shell structure. The difference in residence time for sintering and coalescence yielded different morphologies of SiO2-TiO2 nanocomposites. The results from FTIR confirmed Si-O-Ti bonding for all samples. The samples of SiO2-TiO2 exhibited better suspension in liquid than pure TiO2 as confirmed by zeta potential measurements.

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Yang, Haiyan, Liang Jiang, Yizhou Li, Guoqing Li, Yepeng Yang, Jiao He, Jiaqiang Wang et Zhiying Yan. « Highly Efficient Red Cabbage Anthocyanin Inserted TiO2 Aerogel Nanocomposites for Photocatalytic Reduction of Cr(VI) under Visible Light ». Nanomaterials 8, n^o 11 (14 novembre 2018) : 937. http://dx.doi.org/10.3390/nano8110937.

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In sharp contrast to conventional photosensitization methods in which the organic pigments were often adsorbed, herein we present a study on natural vegetable pigment inserted TiO2 aerogel nanocomposites and we directly use red cabbage anthocyanin (RCP) as a structure-directing agent. It was found that pure TiO2 aerogel nanocomposite did not exhibit any meaningful activity for photocatalytic reduction of Cr(VI). However, the photocatalytic reduction activity was greatly improved by the RCP inserted TiO2 aerogel nanocomposites under visible-light irradiation, which was approximately 2- and 12.3-fold higher than that of TiO2 aerogel conventionally photosensitized by RCP and pure TiO2 aerogel nanocomposites, respectively. It also exhibited good stability and could be reused at least three times without losing a significant amount of its activity.

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