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Integration of heterogeneous photocatalysis and persulfate based oxidation using TiO(2)-reduced graphene oxide for water decontamination and disinfection
Advanced oxidation processes (AOPs) which involve the generation of highly reactive free radicals have been considered as a promising technology for the decontamination of water from chemical and bacterial pollutants. In this study, integration of two major AOPs viz., heterogeneous photocatalysis in...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8273424/ https://www.ncbi.nlm.nih.gov/pubmed/34286128 http://dx.doi.org/10.1016/j.heliyon.2021.e07451 |
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author | John, Deepthi Jose, Jiya Bhat, Sarita G. Achari, V. Sivanandan |
author_facet | John, Deepthi Jose, Jiya Bhat, Sarita G. Achari, V. Sivanandan |
author_sort | John, Deepthi |
collection | PubMed |
description | Advanced oxidation processes (AOPs) which involve the generation of highly reactive free radicals have been considered as a promising technology for the decontamination of water from chemical and bacterial pollutants. In this study, integration of two major AOPs viz., heterogeneous photocatalysis involving TiO(2)-reduced graphene oxide (T-RGO) nanocomposite and activated persulfate (PS) based oxidation was attempted to remove diclofenac (DCF), a frequently detected pharmaceutical contaminant in water. The enhanced visible light responsiveness of T-RGO would facilitate the use of direct sunlight as a benign and cost effective source of energy for the photocatalytic activation. By combining PS based oxidation process with T-RGO mediated photocatalysis, a DCF removal efficiency of more than 98% was achieved within 30 min. The effect of operating parameters like PS concentration and pH on DCF removal was assessed. Radical scavenging experiments indicated that apart from radical oxidation involving (•)OH and [Formula: see text] radicals, a non-radical oxidation pathway was also taking place in the degradation. The antibacterial properties of the integrated system were also evaluated using Escherichia coli and Staphylococcus aureus as representative bacteria. The presence of PS in the photocatalytic reaction system improved the antibacterial activity of the composite against the two strains studied. Cytotoxicity of T-RGO nanocomposite was assessed using human macrophage cell lines and the results showed that the composite is biocompatible and nontoxic at the recommended dosage for water treatment in the present study. |
format | Online Article Text |
id | pubmed-8273424 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-82734242021-07-19 Integration of heterogeneous photocatalysis and persulfate based oxidation using TiO(2)-reduced graphene oxide for water decontamination and disinfection John, Deepthi Jose, Jiya Bhat, Sarita G. Achari, V. Sivanandan Heliyon Research Article Advanced oxidation processes (AOPs) which involve the generation of highly reactive free radicals have been considered as a promising technology for the decontamination of water from chemical and bacterial pollutants. In this study, integration of two major AOPs viz., heterogeneous photocatalysis involving TiO(2)-reduced graphene oxide (T-RGO) nanocomposite and activated persulfate (PS) based oxidation was attempted to remove diclofenac (DCF), a frequently detected pharmaceutical contaminant in water. The enhanced visible light responsiveness of T-RGO would facilitate the use of direct sunlight as a benign and cost effective source of energy for the photocatalytic activation. By combining PS based oxidation process with T-RGO mediated photocatalysis, a DCF removal efficiency of more than 98% was achieved within 30 min. The effect of operating parameters like PS concentration and pH on DCF removal was assessed. Radical scavenging experiments indicated that apart from radical oxidation involving (•)OH and [Formula: see text] radicals, a non-radical oxidation pathway was also taking place in the degradation. The antibacterial properties of the integrated system were also evaluated using Escherichia coli and Staphylococcus aureus as representative bacteria. The presence of PS in the photocatalytic reaction system improved the antibacterial activity of the composite against the two strains studied. Cytotoxicity of T-RGO nanocomposite was assessed using human macrophage cell lines and the results showed that the composite is biocompatible and nontoxic at the recommended dosage for water treatment in the present study. Elsevier 2021-07-03 /pmc/articles/PMC8273424/ /pubmed/34286128 http://dx.doi.org/10.1016/j.heliyon.2021.e07451 Text en © 2021 The Author(s) https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Research Article John, Deepthi Jose, Jiya Bhat, Sarita G. Achari, V. Sivanandan Integration of heterogeneous photocatalysis and persulfate based oxidation using TiO(2)-reduced graphene oxide for water decontamination and disinfection |
title | Integration of heterogeneous photocatalysis and persulfate based oxidation using TiO(2)-reduced graphene oxide for water decontamination and disinfection |
title_full | Integration of heterogeneous photocatalysis and persulfate based oxidation using TiO(2)-reduced graphene oxide for water decontamination and disinfection |
title_fullStr | Integration of heterogeneous photocatalysis and persulfate based oxidation using TiO(2)-reduced graphene oxide for water decontamination and disinfection |
title_full_unstemmed | Integration of heterogeneous photocatalysis and persulfate based oxidation using TiO(2)-reduced graphene oxide for water decontamination and disinfection |
title_short | Integration of heterogeneous photocatalysis and persulfate based oxidation using TiO(2)-reduced graphene oxide for water decontamination and disinfection |
title_sort | integration of heterogeneous photocatalysis and persulfate based oxidation using tio(2)-reduced graphene oxide for water decontamination and disinfection |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8273424/ https://www.ncbi.nlm.nih.gov/pubmed/34286128 http://dx.doi.org/10.1016/j.heliyon.2021.e07451 |
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