Sulfur-doped g-C3N4 heterojunctions for efficient visible light degradation of methylene blue
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/272305 |
Resumo: | The discharge of synthetic dyes from different industrial sources has become a global issue of concern. Enormous amounts are released into wastewater each year, causing concerns due to the high toxic consequences. Photocatalytic semiconductors appear as a green and sustainable form of remediation. Among them, graphitic carbon nitride (g-C3N4) has been widely studied due to its low cost and ease of fabrication. In this work, the synthesis, characterization, and photocatalytic study over methylene blue of undoped, B/S-doped, and exfoliated heterojunctions of g-C3N4 are presented. The evaluation of the photocatalytic performance showed that exfoliated undoped/S-doped heterojunctions with 25, 50, and 75 mass % of S-doped (g-C3N4) present enhanced activity with an apparent reaction rate constant (kapp) of 1.92 × 10–2 min–1 for the 75% sample. These results are supported by photoluminescence (PL) experiments showing that this heterojunction presents the less probable electron–hole recombination. UV–vis diffuse reflectance and valence band-X-ray photoelectron spectroscopy (VB-XPS) allowed the calculation of the band-gap and the valence band positions, suggesting a band structure diagram describing a type I heterojunction. The photocatalytic activities calculated demonstrate that this property is related to the surface area and porosity of the samples, the semiconductor nature of the g-C3N4 structure, and, in this case, the heterojunction that modifies the band structure. These results are of great importance considering that scarce reports are found concerning exfoliated B/S-doped heterojunctions. |
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Pérez-Torres, Andrés FelipeHernández-Barreto, Diego F.Bernal, ValentinaGiraldo, LilianaMoreno-Piraján, Juan CarlosSilva, Edjan Alves daAlves, Maria do Carmo MartinsMorais, JonderHernandez, YennyCortés, María T.Macias Lopez, Mario Alberto2024-02-28T05:03:31Z20232470-1343http://hdl.handle.net/10183/272305001195912The discharge of synthetic dyes from different industrial sources has become a global issue of concern. Enormous amounts are released into wastewater each year, causing concerns due to the high toxic consequences. Photocatalytic semiconductors appear as a green and sustainable form of remediation. Among them, graphitic carbon nitride (g-C3N4) has been widely studied due to its low cost and ease of fabrication. In this work, the synthesis, characterization, and photocatalytic study over methylene blue of undoped, B/S-doped, and exfoliated heterojunctions of g-C3N4 are presented. The evaluation of the photocatalytic performance showed that exfoliated undoped/S-doped heterojunctions with 25, 50, and 75 mass % of S-doped (g-C3N4) present enhanced activity with an apparent reaction rate constant (kapp) of 1.92 × 10–2 min–1 for the 75% sample. These results are supported by photoluminescence (PL) experiments showing that this heterojunction presents the less probable electron–hole recombination. UV–vis diffuse reflectance and valence band-X-ray photoelectron spectroscopy (VB-XPS) allowed the calculation of the band-gap and the valence band positions, suggesting a band structure diagram describing a type I heterojunction. The photocatalytic activities calculated demonstrate that this property is related to the surface area and porosity of the samples, the semiconductor nature of the g-C3N4 structure, and, in this case, the heterojunction that modifies the band structure. These results are of great importance considering that scarce reports are found concerning exfoliated B/S-doped heterojunctions.application/pdfengACS Omega. Washington. Vol. 8, no. 50 (Dec. 2023), p. 47821-47834SemicondutoresAzul de metilenoFotocatáliseSulfur-doped g-C3N4 heterojunctions for efficient visible light degradation of methylene blueEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001195912.pdf.txt001195912.pdf.txtExtracted Texttext/plain61070http://www.lume.ufrgs.br/bitstream/10183/272305/2/001195912.pdf.txt159d78f5a15b6fc03ccf6e5e919293a7MD52ORIGINAL001195912.pdfTexto completo (inglês)application/pdf7689732http://www.lume.ufrgs.br/bitstream/10183/272305/1/001195912.pdf56c8f3aff8073b21365dd99271993194MD5110183/2723052024-04-20 06:34:44.5639oai:www.lume.ufrgs.br:10183/272305Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-04-20T09:34:44Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Sulfur-doped g-C3N4 heterojunctions for efficient visible light degradation of methylene blue |
title |
Sulfur-doped g-C3N4 heterojunctions for efficient visible light degradation of methylene blue |
spellingShingle |
Sulfur-doped g-C3N4 heterojunctions for efficient visible light degradation of methylene blue Pérez-Torres, Andrés Felipe Semicondutores Azul de metileno Fotocatálise |
title_short |
Sulfur-doped g-C3N4 heterojunctions for efficient visible light degradation of methylene blue |
title_full |
Sulfur-doped g-C3N4 heterojunctions for efficient visible light degradation of methylene blue |
title_fullStr |
Sulfur-doped g-C3N4 heterojunctions for efficient visible light degradation of methylene blue |
title_full_unstemmed |
Sulfur-doped g-C3N4 heterojunctions for efficient visible light degradation of methylene blue |
title_sort |
Sulfur-doped g-C3N4 heterojunctions for efficient visible light degradation of methylene blue |
author |
Pérez-Torres, Andrés Felipe |
author_facet |
Pérez-Torres, Andrés Felipe Hernández-Barreto, Diego F. Bernal, Valentina Giraldo, Liliana Moreno-Piraján, Juan Carlos Silva, Edjan Alves da Alves, Maria do Carmo Martins Morais, Jonder Hernandez, Yenny Cortés, María T. Macias Lopez, Mario Alberto |
author_role |
author |
author2 |
Hernández-Barreto, Diego F. Bernal, Valentina Giraldo, Liliana Moreno-Piraján, Juan Carlos Silva, Edjan Alves da Alves, Maria do Carmo Martins Morais, Jonder Hernandez, Yenny Cortés, María T. Macias Lopez, Mario Alberto |
author2_role |
author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Pérez-Torres, Andrés Felipe Hernández-Barreto, Diego F. Bernal, Valentina Giraldo, Liliana Moreno-Piraján, Juan Carlos Silva, Edjan Alves da Alves, Maria do Carmo Martins Morais, Jonder Hernandez, Yenny Cortés, María T. Macias Lopez, Mario Alberto |
dc.subject.por.fl_str_mv |
Semicondutores Azul de metileno Fotocatálise |
topic |
Semicondutores Azul de metileno Fotocatálise |
description |
The discharge of synthetic dyes from different industrial sources has become a global issue of concern. Enormous amounts are released into wastewater each year, causing concerns due to the high toxic consequences. Photocatalytic semiconductors appear as a green and sustainable form of remediation. Among them, graphitic carbon nitride (g-C3N4) has been widely studied due to its low cost and ease of fabrication. In this work, the synthesis, characterization, and photocatalytic study over methylene blue of undoped, B/S-doped, and exfoliated heterojunctions of g-C3N4 are presented. The evaluation of the photocatalytic performance showed that exfoliated undoped/S-doped heterojunctions with 25, 50, and 75 mass % of S-doped (g-C3N4) present enhanced activity with an apparent reaction rate constant (kapp) of 1.92 × 10–2 min–1 for the 75% sample. These results are supported by photoluminescence (PL) experiments showing that this heterojunction presents the less probable electron–hole recombination. UV–vis diffuse reflectance and valence band-X-ray photoelectron spectroscopy (VB-XPS) allowed the calculation of the band-gap and the valence band positions, suggesting a band structure diagram describing a type I heterojunction. The photocatalytic activities calculated demonstrate that this property is related to the surface area and porosity of the samples, the semiconductor nature of the g-C3N4 structure, and, in this case, the heterojunction that modifies the band structure. These results are of great importance considering that scarce reports are found concerning exfoliated B/S-doped heterojunctions. |
publishDate |
2023 |
dc.date.issued.fl_str_mv |
2023 |
dc.date.accessioned.fl_str_mv |
2024-02-28T05:03:31Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/272305 |
dc.identifier.issn.pt_BR.fl_str_mv |
2470-1343 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001195912 |
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2470-1343 001195912 |
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http://hdl.handle.net/10183/272305 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
ACS Omega. Washington. Vol. 8, no. 50 (Dec. 2023), p. 47821-47834 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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