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https://repositorio.ufba.br/handle/ri/5432
Tipo: | Artigo de Periódico |
Título: | Evaluating the effectiveness of photocatalysts based on titanium dioxide in the degradation of the dye Ponceau 4R |
Título(s) alternativo(s): | Dyes and Pigments |
Autor(es): | Oliveira, Danielle F. M. Batista, Paulo Sérgio Muller Junior, Paulo S. Velani, Valdemir França, Marcela D. Souza, Danilo R. de Machado, Antonio E. H. |
Autor(es): | Oliveira, Danielle F. M. Batista, Paulo Sérgio Muller Junior, Paulo S. Velani, Valdemir França, Marcela D. Souza, Danilo R. de Machado, Antonio E. H. |
Abstract: | The performance of different titanium dioxide (TiO2) catalysts and a composite based on the association between TiO2 P25 and Zinc Phthalocyanine (TiO2/ZnPc 1.6%) was evaluated in the photocatalytic degradation of the dye Ponceau 4R (C.I. 16255). The results show that the composite presents a better performance than the other, reaching about 50% mineralization of the dye in 120 min of reaction, around three times higher than that observed under the action of pure TiO2 P25, although this catalyst presents a quantum yield of hydroxyl radical generation about three times higher than that estimated for the composite. This result seems to be a consequence of the synergism between the electronically excited ZnPc aggregates and the TiO2 surface. A parallel study, based on methods from quantum mechanics also suggested the most feasible routes for the photodegradation of the dye in the absence of the catalyst. |
Palavras-chave: | TiO2/zinc phthalocyanine composite AOP TiO2 photocatalysts Photodegradation Ponceau 4R DFT |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/5432 |
Data do documento: | 2011 |
Aparece nas coleções: | Artigo Publicado em Periódico (ICADS) |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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Evaluating the effectiveness of photocatalysts based on titanium dioxide.pdf Restricted Access | 279,58 kB | Adobe PDF | Visualizar/Abrir Solicitar uma cópia |
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