Photochemically deposited nano-Ag/sol–gel TiO2–In2O3 mixed oxide mesoporous-assembled nanocrystals for photocatalytic dye degradation
| Autor: | Supachai Ngamsinlapasathian, Susumu Yoshikawa, Thammanoon Sreethawong |
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| Rok vydání: | 2014 |
| Předmět: |
Silver
Materials science Inorganic chemistry Nanoparticle Indium Catalysis Biomaterials chemistry.chemical_compound Hydrolysis Colloid and Surface Chemistry Microscopy Electron Transmission X-Ray Diffraction Coloring Agents Sol-gel Titanium Photochemical Processes Surfaces Coatings and Films Electronic Optical and Magnetic Materials Congo red chemistry Microscopy Electron Scanning Photocatalysis Nanoparticles Mixed oxide Spectrophotometry Ultraviolet Mesoporous material Nuclear chemistry |
| Zdroj: | Journal of Colloid and Interface Science. 421:191-198 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2014.02.002 |
| Popis: | This work focused on the improvement of the photocatalytic activity for Congo Red (CR) azo dye degradation of mesoporous-assembled 0.95 TiO2-0.05 In2O3 mixed oxide photocatalyst (with a TiO2-to-In2O3 molar ratio of 0.95:0.05) by loading with Ag nanoparticles. The mesoporous-assembled 0.95TiO2-0.05In2O3 mixed oxide photocatalyst was synthesized by a hydrolytic sol-gel method with the aid of a structure-directing surfactant, prior to loading with various Ag contents (0.5-2 wt.%) by a photochemical deposition method. The optimum Ag loading content was found to be 1.5 wt.%, exhibiting a great increase in photocatalytic CR dye degradation activity. The 1.5 wt.% Ag-loaded 0.95TiO2-0.05In2O3 mixed oxide photocatalyst was further applied for the CR dye degradation in the presence of water hardness. Different types (Ca2+ and Ca2+ -Mg2+ mixture) and concentrations (200 and 500 mg/l) of water hardness were investigated. The results showed that the water hardness reduced the photocatalytic CR dye degradation activity, particularly for the extremely hard water with 500 mg/l of Ca2+ -Mg2+ mixture. The adjustment of initial solution pH of the CR dye-containing hard water to an appropriate value was found to improve the photocatalytic CR dye degradation activity under the identical reaction conditions. |
| Databáze: | OpenAIRE |
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