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AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Study of self cleaning fabric modified by Cu doped TiO2 with the addition of tetraethyl orthosilicate (TEOS)
摘要： Study of self – cleaning fabric modified by Cu doped TiO2 with the addition of TEOS has been done to achieve high performance of self – cleaning fabric. TiO2 doped Cu were made by using Photo Assisted Deposition (PAD) method. After that, certain compositions of the water, TEOS and Cu – TiO2 catalyst with the TEOS variated are prepared to be padded by the fabric and then dryed in the oven at certain temperature. The addition of TEOS in fabric coating is to improved the catalyst performance in self – cleaning ability and photodegradation of methylen blue. After the fabric is made, then analyzed it by using FTIR. The photodegradation is tested by puting a small amount of fabric to a methylen blue solution for 2 hours to see its absorbance using UV – Vis Spectroscopy and the self – cleaning ability test is to put the fabric in a sludge dirt for several minutes then spray it with water. FTIR result showed that the addition of TEOS cause Ti – O – Si bond to be applied in the fabric. The fabric coated with doped TiO2 has better performance than the undoped on both MB photodegradation and self – cleaning ability. The MB photodegradation performance of fabric increased with the amount of TEOS up to 74.4% within 2 hours and the efficiency of sludge dirt self – cleaning of fabric increased with the amount of fabric up to 83% efficiency, which is the type of fabric cotton Cu – TiO2 1,2% Si was the best among the other type of fabrics.
关键词： photodegradation,TEOS,methylene blue,self-cleaning fabric,Cu doped TiO2
更新于2025-09-04 15:30:14
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A Study on Photocatalytic Behaviors of Activated Carbon Fibers Impregnated with N-Doped Titania
摘要： Activated carbon ?bers (ACFs) impregnated with N-doped titania were prepared via the sol–gel method and sonochemical synthesis. The photocatalytic behavior of rhodamine B showed that N-doped TiO2/ACF nanocomposites exhibited enhanced photocatalytic activity. This result could be attributed to the synergistic effect between the high adsorption capacity of ACF and the visible light photocatalytic activity of N-doped TiO2. In particular, the N-doped TiO2/ACF nanocomposite that was sonicated four times had the highest photocatalytic ef?ciency and degradation rate, owing to the optimal N-doped TiO2 loading and nanocomposite pore structure.
关键词： N-doped TiO2,Sonochemical Synthesis,Activated Carbon Fibers,Photodegradation
更新于2025-09-04 15:30:14
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Electro-photocatalytic Fenton Decolorization of Orange G Using Mesoporous TiO2/stainless Steel Mesh Photo-Electrode Prepared by the Sol-Gel Dip-Coating Method
摘要： A photo-electrochemical process is a powerful and eco-friendly method for treating industrial wastewater. Electro-photocatalytic Fenton (EPF) was employed for orange G decolorization using two kinds of photo-electrodes with TiO2 film-coated stainless steel (SS) mesh. These photo-electrodes are prepared by a dip-coating method from the sol-gel-derived TiO2 sols incorporating with various amounts of P25+TiO2 powders (SGDC method). The single dip-coated electrode with the TiO2 sol containing 50 g/L P25 powders possesses similar crystallinity and decolorization performance to the four repetitive dip-coated electrodes with pure TiO2 sol. The kinetics of orange G decolorization using P25+TiO2 film electrode in photocatalytic (PC), electro-Fenton (EF) and EPF processes followed pseudo first-order kinetics model, and the EPF has the highest reaction rate. The efficiency of orange G decolorization achieves 78% via the EPF reaction for 3 h. The SGDC method using the TiO2 sol containing P25 powders not only enhances the TiO2 coating on the SS substrate, but also produces microcracks in the film, that facilitates the in-situ generation of ferrous ions and further induces the EPF reaction for an effective degradation of organic matter in wastewater.
关键词： mesoporous film,P25 TiO2,Sol-gel dip-coating (SGDC),electro-photocatalytic Fenton (EPF)
更新于2025-09-04 15:30:14
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Photodegradtion of Methyl Orange in the Water on Undoped and Fe-doped TiO2 Nanotubes
摘要： Undoped and Fe-doped TiO2 nanotubes were fabricated by hydrothermally treating the sol-gel-derived undoped and Fe-doped TiO2 nanoparticles in a KOH aqueous solution. The light absorption edge the nanotubes extended to visible light region of ~449 nm at a maximal Fe molar content (3.86 %). Correspondingly, the optical bandgap narrowed to ~2.76 eV. The sunlight-excited degradation rate of methyl orange aqueous solution on the nanotubes increased as increasing Fe-doping content and initial solution pH. The photodegradation followed pseudo-first order reaction kinetics. The pseudo-kinetic rate constant increased from 0.133 to 0.513 h(cid:2)1 as the increase of Fe content and initial pH. A maximal value was achieved at Fe molar content of 3.86 % and initial solution pH=9. The measurement of oxidation-reduction potential revealed a dominant reductive photocatalytic behavior of the nanotubes. The mechanism of enhancing photocatalysis of TiO2 nanotubes by Fe-doping was proposed.
关键词： nanotubes,enviromant decontaimnant,Advanced oxidation,TiO2,photodegradation
更新于2025-09-04 15:30:14
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Calcination Effects and Photocatalytic Activity of Porous SiO2-TiO2 Material
摘要： A porous SiO2-TiO2 photocatalyst was prepared through co-sol-gel method using PEG1000 template for photocatalytic degradation of methyl orange. Photocatalytic degradation was conducted after adsorption equilibrium to identify the contribution of both adsorption and photocatalytic degradation. The optimum calcination condition for the porous SiO2-TiO2 is 500 °C for 3 h. The adsorption of methyl orange on the photocatalyst has no apparent change in the whole temperature range. Nearly 96.5 % of the initial methyl orange is removed in 100 min under UV light irradiation with the existence of the porous SiO2-TiO2. Methyl orange degradation follows the first order kinetics equation. The azo and benzene structure are degraded into small molecules during photocatalytic oxidation process.
关键词： Photocatalysis,Composite,SiO2,TiO2
更新于2025-09-04 15:30:14
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Synthesis of TiO2/SiO2-B2O3 Ternary Nanocomposites: Influence of Interfacial Properties on their Photocatalytic Activities with High Resolution Mass Spectrometry Monitoring
摘要： An investigation on unusual interface properties of unprecedented ternary composites, formed by the inclusion of assorted proportions of B2O3 into TiO2/SiO2 structure, is conducted herein. The influences of B2O3 content and calcination temperature were evaluated. The precursor TiO2/SiO2 material was synthesized via a simple sol-gel procedure that was followed by B2O3 inclusion via maceration and calcination. The materials were fully characterized and their photocatalytic performance to degrade the Indigo Carmine dye investigated. The material prepared with a B/Ti molar ratio of 1 and at calcination temperature of 350 °C (B1-350) showed the best performance, with a superior photocatalytic activity than that of commercial TiO2. The presence of B2O3-TiO2-SiO2 interfaces in the structure of such material was of critical importance in producing a material with these attractive features. Finally, high resolution mass spectrometry monitoring allowed for the characterization of the main degradation products formed under these conditions.
关键词： high resolution mass spectrometry,degradation of Indigo Carmine,B2O3-TiO2-SiO2 ternary nanocomposites,photocatalytic activity,by-products characterization,structural defects
更新于2025-09-04 15:30:14
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A Study of Controllable Synthesis and Formation Mechanism on Flower-Like TiO2 with Spherical Structure
摘要： The development of photocatalytic materials with specific morphologies promises to be a good opportunity to discover geometrically relevant properties. Herein, this paper reported a facile hydrothermal method to directly synthesize TiO2 crystals with flower-like structures using tetrabutyl titanate (TBT) as a titanium source and ethylene glycol as an additive. We also proposed a reasonable growth mechanism by controlling reaction time in detail. The as-prepared samples were analyzed by using X-ray diffraction, scanning electron microscopy and transmission electron microscopy for structure and morphology characterization. The N2 adsorption-desorption isotherm results showed that the surface area of flower-like TiO2 with 10 h reaction time can reach 297 m2/g. We evaluated the photocatalytic performance of samples by using the degradation rate of methylene blue (MB) solution under UV-vis light. The TiO2 with 10 h reaction time exhibited a superior photocatalytic property than other samples in degrading MB under UV-vis light irradiation. More importantly, the catalyst could be reused many times. These results could benefit from the special morphology, high crystallinity and large specific surface area of the samples.
关键词： flower-like,photocatalytic activity,TiO2
更新于2025-09-04 15:30:14
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Highly efficient multifunctional Ag/TiO2 nanotubes/Ti plate coated with MIL-88B(Fe) as a photocatalyst, adsorbent, and disinfectant in water treatment
摘要： Multifunctional MIL-88B(Fe)–Ag/TiO2 nanotubes/Ti plates were prepared via dip-coating process. Pollutant removals from aqueous solutions were investigated using three different reactions: (1) adsorption of heavy metal ion (Pb2+ and Cd2+), (2) photocatalytic degradation of methyl orange dye (MO), and (3) antibacterial effect for Escherichia coli (E. coli) degradation. Photocatalytic results for dye degradation under UV light irradiation proved the highest activity of the MIL-88B(Fe)–Ag/TiO2 nanotubes/Ti plates. The degradation rate constant of MIL-88B(Fe)–Ag/TiO2 nanotubes/Ti plates was approximately four times as that of pure TiO2 nanotubes/Ti under UV irradiation. In addition, this plate showed the effective removal of heavy metal ions by sorption process. The adsorption of Pb2+ and Cd2+on the MIL-88B(Fe)–Ag/TiO2 nanotubes/Ti plates reached a maximum capacity of 113 and 138 mg/g, and this value was approximately 1.6 times as that of pure TiO2 nanotubes/Ti. In addition, the multifunctional composite plates demonstrated great antibacterial activities towards E. coli. All bacteria colonies killed after 60 min photocatalytic treatment on MIL-88B(Fe)–Ag/TiO2 nanotubes/Ti plates. The results show the importance of a cooperative effect between the MIL-88B(Fe) metal organic framework (MOF) and Ag/TiO2 nanotubes/Ti plates. The simultaneous removals of these pollutants with the high efficiency showed an facile approach for the polluted water treatment via the newly fabricated MIL-88B(Fe)–Ag/TiO2 nanotubes/Ti plate with multiple functions.
关键词： Photocatalyst,Ag/TiO2 nanotubes/Ti,MIL-88B(Fe),Water treatment,Disinfectant,Adsorbent
更新于2025-09-04 15:30:14
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Controllable synthesis of transparent dispersions of monodisperse anatase-TiO2 nanoparticles and nanorods
摘要： Controllable synthesis of monodisperse nanocrystals is still a great challenge. In this study, the control strategy of alcohol medium was developed to conveniently synthesize monodisperse anatase-TiO2 nanocrystals with controllable size and shape by sol-gel method combined with solvothermal treatment. The effects of the amount of stearic acid and water, and molecular structure of alcohol on the size, the shape and the dispersity of TiO2 nanocrystals were explored. The optimum synthesis conditions were achieved. Monodisperse TiO2 nanoparticles and nanorods were obtained by using linear and branched alcohols, respectively. The size of nanoparticles decreased from 12 to 5 nm with increasing carbon number of linear alcohol. The aspect ratio of nanorods was adjusted from 1 to 5 by selecting alcohols with different locations of branched methyl group. The as-prepared monodisperse TiO2 nanocrystals could be readily dispersed in some commonly-used solvents to form transparent nanodispersions. Furthermore, a possible formation mechanism was also investigated.
关键词： Monodisperse TiO2 nanocrystals,transparent dispersion,nanoparticles,nanorods,tunable preparation
更新于2025-09-04 15:30:14
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Cascade electronic band structured zinc oxide/ bismuth vanadate/ three-dimensional ordered macroporous titanium dioxide ternary nanocomposites for enhanced visible light photocatalysis
摘要： Ternary zinc oxide/ bismuth vanadate/ three-dimensional ordered macroporous titanium dioxide (ZnO/BiVO4/3DOM TiO2) heterojuncted nanocomposites with cascade electronic band structures were successfully designed and synthesized for visible light photodegradation of two different molecules: Rhodamine B (RhB) and Tartrazine. The photocatalytic active species have been investigated by using electron scavenger (AgNO3) and hole scavenger (Triethanolamine: TEOA). The band edge positions of each component in tenary nanocomposites have been measured by using photoelectrochemical Mott-Schottky method and valence band XPS (VB-XPS) spectroscopy. Within the heterojunction, charges are favorably and spatially separated through the gradient potential at the interfaces. This largely suppresses the recombination of photogenerated electrons and holes. Furthermore, 3DOM inverse opal structure is beneficial for high diffusion efficiency and highly accessible surface area of reactants and light and multiple scattering for light harvesting. Consequently, these heterojuncted nanocomposites exhibit highly enhanced photocatalytic performance compared with pure BiVO4 nanostructure, and binary BiVO4/3DOM TiO2, ZnO/BiVO4 nanocomposites. A detailed mechanism of charge transfer is proposed for these ternary ZnO/BiVO4/3DOM TiO2 nanocomposites on the basis of a large series of spectroscopic and photocatalytic results. Our work demonstrates clearly that coupling multicomponent semiconductors with different energy levels of conduction and valence bands can significantly increase the photogenerated charge carriers through the efficient charge separation across their multiple interfaces. This work gives some new ideas on developing new visible light responsive nanocomposites for highly efficient solar energy utilization.
关键词： visible light,RhB and Tartrazine,Ternary ZnO/BiVO4/3DOM TiO2 nanocomposites,photogenerated electron–hole pairs,heterojunction structures
更新于2025-09-04 15:30:14