Catalytic degradation of Acid Orange 7 by H2O2as promoted by either bare or V-loaded titania under UV light, in dark conditions, and after incubating the catalysts in ascorbic acid
| Autor: | Edoardo Garrone, Marco Piumetti, Giovanny Esteban Gonzalez, Marco Armandi, Francesca Stefania Freyria, Barbara Bonelli, Guido Saracco |
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| Rok vydání: | 2015 |
| Předmět: |
Anatase
Materials science Azo dye degradation Materials Science (miscellaneous) Radical Vanadium chemistry.chemical_element 02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences Catalysis Analytical Chemistry Mesoporous titania Fenton reaction chemistry.chemical_compound Hydrogen peroxide 021001 nanoscience & nanotechnology Ascorbic acid 0104 chemical sciences chemistry Mechanics of Materials Photocatalysis 0210 nano-technology Mesoporous material Mesoporous titania Azo dye degradation Hydrogen peroxide Ascorbic acid Fenton reaction |
| Zdroj: | Catalysis, Structure & Reactivity. 1:183-191 |
| ISSN: | 2055-0758 2055-074X |
| Popis: | Pure and V-loaded mesoporous titania (with 2.5 wt-% V) were prepared by template-assisted synthesis and compared to commercial titania (Degussa P25), both as such and after vanadium loading. Mesoporous TiO2 occurred as pure anatase nanoparticles with higher surface area (SSA = 150 m2 g−1) than P25 (SSA = 56 m2 g−1).Degradation of the azo dye Acid Orange 7 by H2O2 was used as a test reaction: under UV light, no difference emerged between mesoporous TiO2 and P25, whereas in dark conditions, higher SSA of the mesoporous sample resulted in higher conversions. Under UV illumination, surface V5+ species inhibited photocatalytic activity, by forming inactive V4+ species. Similarly, in dark conditions, V5+ surface species reacted with H2O2, likely yielding ·O2H radicals and reducing to V4+. On the contrary, V-containing catalysts were very active after pretreatment with ascorbic acid, which reduced V5+ species to V3+species, the latter promoting very lively a Fenton-like reaction. |
| Databáze: | OpenAIRE |
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