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Título: | Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor. |
Autor(es): | Silva, Adilson Cândido da Almeida, Monique Rocha Rodriguez, Mariandry del Valle Rodriguez Machado, Alan Rodrigues Teixeira Oliveira, Luiz Carlos Alves de Pereira, Márcio César |
Palavras-chave: | Iron oxides Dye oxidation Photodegradation Photocatalysts |
Data do documento: | 2017 |
Referência: | SILVA, A. C. da et al. Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor. Journal of Photochemistry and Photobiology A-Chemistry, v. 332, p. 54-59, jan. 2017. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1010603016302416> Acesso em: 15 set. 2017. |
Resumo: | In this work, d-FeOOH nanoparticles were synthesized by a simple co-precipitation method and used as a photocatalyst in the presence of H2O2 for the oxidation of Rhodamine B (RhB) dye under artificial light. The d-FeOOH was characterized by powder X-ray diffraction, 57Fe Mössbauer spectroscopy, N2 adsorption/desorption and UV–vis diffuse reflectance measurements. The d-FeOOH nanoparticles have high specific surface area (101 m2 g 1) and optical bandgap energy of 2.02 eV. Under artificial light, only 59% of RhB (100 mL; 20 mg L 1) was photocatalytically degraded by d-FeOOH in 60 min reaction. However, after adding H2O2, the photocatalytic activity of d-FeOOH was significantly improved, reaching 87% of dye removal. Tests using scavengers of reactive species and EPR analysis revealed that h+ and OH are the main species in this system. Based on the experimental results, the mechanism of RhB photodegradation in the presence of d-FeOOH and H2O2 was proposed. By this mechanism, the OH can be formed by direct water oxidation or by H2O2 reduction, as the electron transfer from the conduction band of d-FeOOH to H2O2 is thermodynamically favorable. Moreover, the H2O2 retards the electron-hole recombination in d-FeOOH, thus increasing its photocatalytic activity. Given its high efficiency for degrading RhB in water, d-FeOOH revealed to be a promising photocatalyst to be tested in the oxidation of emerging pollutants for the environmental decontamination. |
URI: | http://www.repositorio.ufop.br/handle/123456789/9589 |
DOI: | https://doi.org/10.1016/j.jphotochem.2016.08.013 |
ISSN: | 1010-6030 |
Licença: | O periódico Journal of Photochemistry and Photobiology A: Chemistry concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 4210810560222. |
Aparece nas coleções: | DEQUI - Artigos publicados em periódicos |
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ARTIGO_ImprovedPhotocatalyticActivity.pdf | 1,35 MB | Adobe PDF | Visualizar/Abrir |
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