Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorSilva, Adilson Cândido da-
Autor(es): dc.creatorAlmeida, Monique Rocha-
Autor(es): dc.creatorRodriguez, Mariandry del Valle Rodriguez-
Autor(es): dc.creatorMachado, Alan Rodrigues Teixeira-
Autor(es): dc.creatorOliveira, Luiz Carlos Alves de-
Autor(es): dc.creatorPereira, Márcio César-
Data de aceite: dc.date.accessioned2025-08-21T15:13:00Z-
Data de disponibilização: dc.date.available2025-08-21T15:13:00Z-
Data de envio: dc.date.issued2018-03-13-
Data de envio: dc.date.issued2018-03-13-
Data de envio: dc.date.issued2017-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/9589-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.jphotochem.2016.08.013-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1006368-
Descrição: dc.descriptionIn 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.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsaberto-
Direitos: dc.rightsO periódico Journal of Photochemistry and Photobiology A: Chemistry concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 4210810560222.-
Palavras-chave: dc.subjectIron oxides-
Palavras-chave: dc.subjectDye oxidation-
Palavras-chave: dc.subjectPhotodegradation-
Palavras-chave: dc.subjectPhotocatalysts-
Título: dc.titleImproved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor.-
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