Evaluation of photocatalytic activities of supported catalysts on NaX zeolite or activated charcoal
| Autor: | Fernanda F. Brites-Nóbrega, Aldino N.B. Polo, Nádia Regina Camargo Fernandes-Machado, Veronice Slusarski-Santana, Mônica Maria Diniz Leão, Angélica M. Benedetti |
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| Rok vydání: | 2013 |
| Předmět: |
Environmental Engineering
Ultraviolet Rays Niobium Health Toxicology and Mutagenesis Radical Inorganic chemistry Oxide Catalysis Hydrolysis chemistry.chemical_compound Environmental Chemistry Irradiation Coloring Agents Zeolite Waste Management and Disposal Photolysis Chemistry Oxides Pollution Activated charcoal Charcoal Zeolites Photocatalysis Zinc Oxide Azo Compounds Nuclear chemistry |
| Zdroj: | Journal of Hazardous Materials. 263:61-66 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2013.07.061 |
| Popis: | This study aimed to evaluate the photocatalytic activity of ZnO and Nb 2 O 5 catalysts, both supported on NaX zeolite and activated charcoal (AC). The synergistic effect between oxide and support and the influence of solution pH (3, 7 and 9) on photocatalytic degradation of reactive blue 5G (C.I. 222) were analyzed. The catalysts Nb 2 O 5 /NaX, Nb 2 O 5 /AC and ZnO/NaX, ZnO/AC with 5 and 10% (wt%) were prepared by wet impregnation. The results showed that the catalysts exhibit quite different structural and textural properties. The synergic effect between ZnO and NaX support was higher than that with the activated charcoal, showing that these catalysts were more efficient. The most photoactive catalyst was 10% ZnO/NaX which showed 100% discoloration of the dye solution at pH 3, 7 and 9 after 0.5, 5 and 2 h of irradiation, respectively. The hydrolytic nature of zeolite favored the formation of surface hydroxyl radicals, which increased the activity of the photocatalyst. Thus, catalysts supported on NaX zeolite are promising for use in photocatalysis. |
| Databáze: | OpenAIRE |
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