Cargando…
Functionalized Graphene Derivatives and TiO(2) for High Visible Light Photodegradation of Azo Dyes
Functionalized graphene derivatives including graphene oxide (GO), reduced graphene oxide (rGO), and heteroatom (nitrogen/sulphur (N/S) or boron (B))-doped graphene were used to synthesize composites with TiO(2) (T). The photocatalytic performance of composites was assessed for the degradation of Or...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7353273/ https://www.ncbi.nlm.nih.gov/pubmed/32503186 http://dx.doi.org/10.3390/nano10061106 |
_version_ | 1783557837856702464 |
---|---|
author | Pérez-Molina, Álvaro Morales-Torres, Sergio Maldonado-Hódar, Francisco J. Pastrana-Martínez, Luisa M. |
author_facet | Pérez-Molina, Álvaro Morales-Torres, Sergio Maldonado-Hódar, Francisco J. Pastrana-Martínez, Luisa M. |
author_sort | Pérez-Molina, Álvaro |
collection | PubMed |
description | Functionalized graphene derivatives including graphene oxide (GO), reduced graphene oxide (rGO), and heteroatom (nitrogen/sulphur (N/S) or boron (B))-doped graphene were used to synthesize composites with TiO(2) (T). The photocatalytic performance of composites was assessed for the degradation of Orange G dye (OG) under simulated solar light. All the prepared graphene derivatives—TiO(2) composites showed better photocatalytic performance than bare TiO(2). A higher photocatalytic activity was found for the composites containing GO and N/S co-doped rGO (k(app) = 109.2 × 10(−3) and 48.4 × 10(−3) min(−1), for GO-T and rGONS-T, respectively). The influence of both initial solution pH and the reactive species involved in the OG degradation pathway were studied. The photocatalytic activity of the samples decreased with the increase of the initial pH (from 3.0 to 10.0) due to the occurrence of electrostatic repulsive forces between the photocatalysts surface and the molecules of OG, both negatively charged. The use of selective scavengers showed that although the photogenerated holes dominate the degradation mechanism, radicals and singlet oxygen also participate in the OG degradation pathway. In addition, reutilization experiments indicated that the samples were stable under the reaction conditions used. |
format | Online Article Text |
id | pubmed-7353273 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-73532732020-07-15 Functionalized Graphene Derivatives and TiO(2) for High Visible Light Photodegradation of Azo Dyes Pérez-Molina, Álvaro Morales-Torres, Sergio Maldonado-Hódar, Francisco J. Pastrana-Martínez, Luisa M. Nanomaterials (Basel) Article Functionalized graphene derivatives including graphene oxide (GO), reduced graphene oxide (rGO), and heteroatom (nitrogen/sulphur (N/S) or boron (B))-doped graphene were used to synthesize composites with TiO(2) (T). The photocatalytic performance of composites was assessed for the degradation of Orange G dye (OG) under simulated solar light. All the prepared graphene derivatives—TiO(2) composites showed better photocatalytic performance than bare TiO(2). A higher photocatalytic activity was found for the composites containing GO and N/S co-doped rGO (k(app) = 109.2 × 10(−3) and 48.4 × 10(−3) min(−1), for GO-T and rGONS-T, respectively). The influence of both initial solution pH and the reactive species involved in the OG degradation pathway were studied. The photocatalytic activity of the samples decreased with the increase of the initial pH (from 3.0 to 10.0) due to the occurrence of electrostatic repulsive forces between the photocatalysts surface and the molecules of OG, both negatively charged. The use of selective scavengers showed that although the photogenerated holes dominate the degradation mechanism, radicals and singlet oxygen also participate in the OG degradation pathway. In addition, reutilization experiments indicated that the samples were stable under the reaction conditions used. MDPI 2020-06-03 /pmc/articles/PMC7353273/ /pubmed/32503186 http://dx.doi.org/10.3390/nano10061106 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Pérez-Molina, Álvaro Morales-Torres, Sergio Maldonado-Hódar, Francisco J. Pastrana-Martínez, Luisa M. Functionalized Graphene Derivatives and TiO(2) for High Visible Light Photodegradation of Azo Dyes |
title | Functionalized Graphene Derivatives and TiO(2) for High Visible Light Photodegradation of Azo Dyes |
title_full | Functionalized Graphene Derivatives and TiO(2) for High Visible Light Photodegradation of Azo Dyes |
title_fullStr | Functionalized Graphene Derivatives and TiO(2) for High Visible Light Photodegradation of Azo Dyes |
title_full_unstemmed | Functionalized Graphene Derivatives and TiO(2) for High Visible Light Photodegradation of Azo Dyes |
title_short | Functionalized Graphene Derivatives and TiO(2) for High Visible Light Photodegradation of Azo Dyes |
title_sort | functionalized graphene derivatives and tio(2) for high visible light photodegradation of azo dyes |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7353273/ https://www.ncbi.nlm.nih.gov/pubmed/32503186 http://dx.doi.org/10.3390/nano10061106 |
work_keys_str_mv | AT perezmolinaalvaro functionalizedgraphenederivativesandtio2forhighvisiblelightphotodegradationofazodyes AT moralestorressergio functionalizedgraphenederivativesandtio2forhighvisiblelightphotodegradationofazodyes AT maldonadohodarfranciscoj functionalizedgraphenederivativesandtio2forhighvisiblelightphotodegradationofazodyes AT pastranamartinezluisam functionalizedgraphenederivativesandtio2forhighvisiblelightphotodegradationofazodyes |