Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor.
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFOP |
Texto Completo: | http://www.repositorio.ufop.br/handle/123456789/9589 https://doi.org/10.1016/j.jphotochem.2016.08.013 |
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. |
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Silva, Adilson Cândido daAlmeida, Monique RochaRodriguez, Mariandry del Valle RodriguezMachado, Alan Rodrigues TeixeiraOliveira, Luiz Carlos Alves dePereira, Márcio César2018-03-13T13:10:29Z2018-03-13T13:10:29Z2017SILVA, 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. 2017.1010-6030http://www.repositorio.ufop.br/handle/123456789/9589https://doi.org/10.1016/j.jphotochem.2016.08.013In 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.O periódico Journal of Photochemistry and Photobiology A: Chemistry concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 4210810560222.info:eu-repo/semantics/openAccessIron oxidesDye oxidationPhotodegradationPhotocatalystsImproved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPLICENSElicense.txtlicense.txttext/plain; charset=utf-8924http://www.repositorio.ufop.br/bitstream/123456789/9589/2/license.txt62604f8d955274beb56c80ce1ee5dcaeMD52ORIGINALARTIGO_ImprovedPhotocatalyticActivity.pdfARTIGO_ImprovedPhotocatalyticActivity.pdfapplication/pdf1384157http://www.repositorio.ufop.br/bitstream/123456789/9589/1/ARTIGO_ImprovedPhotocatalyticActivity.pdf8e9f8f5037a4b459fa0a7aa401646cdeMD51123456789/95892020-03-16 07:08:59.97oai:localhost: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ório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332020-03-16T11:08:59Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false |
dc.title.pt_BR.fl_str_mv |
Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor. |
title |
Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor. |
spellingShingle |
Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor. Silva, Adilson Cândido da Iron oxides Dye oxidation Photodegradation Photocatalysts |
title_short |
Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor. |
title_full |
Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor. |
title_fullStr |
Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor. |
title_full_unstemmed |
Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor. |
title_sort |
Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor. |
author |
Silva, Adilson Cândido da |
author_facet |
Silva, Adilson Cândido da Almeida, Monique Rocha Rodriguez, Mariandry del Valle Rodriguez Machado, Alan Rodrigues Teixeira Oliveira, Luiz Carlos Alves de Pereira, Márcio César |
author_role |
author |
author2 |
Almeida, Monique Rocha Rodriguez, Mariandry del Valle Rodriguez Machado, Alan Rodrigues Teixeira Oliveira, Luiz Carlos Alves de Pereira, Márcio César |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Silva, Adilson Cândido da Almeida, Monique Rocha Rodriguez, Mariandry del Valle Rodriguez Machado, Alan Rodrigues Teixeira Oliveira, Luiz Carlos Alves de Pereira, Márcio César |
dc.subject.por.fl_str_mv |
Iron oxides Dye oxidation Photodegradation Photocatalysts |
topic |
Iron oxides Dye oxidation Photodegradation Photocatalysts |
description |
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. |
publishDate |
2017 |
dc.date.issued.fl_str_mv |
2017 |
dc.date.accessioned.fl_str_mv |
2018-03-13T13:10:29Z |
dc.date.available.fl_str_mv |
2018-03-13T13:10:29Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
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. |
dc.identifier.uri.fl_str_mv |
http://www.repositorio.ufop.br/handle/123456789/9589 |
dc.identifier.issn.none.fl_str_mv |
1010-6030 |
dc.identifier.doi.none.fl_str_mv |
https://doi.org/10.1016/j.jphotochem.2016.08.013 |
identifier_str_mv |
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. 1010-6030 |
url |
http://www.repositorio.ufop.br/handle/123456789/9589 https://doi.org/10.1016/j.jphotochem.2016.08.013 |
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eng |
language |
eng |
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info:eu-repo/semantics/openAccess |
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openAccess |
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