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New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation

Rhodamine B (RhB) has often been used as a model pollutant, but its photocatalytic mechanism is still controversial. Herein, Ag NPs were sandwiched between CdS QDs and amorphous-TiO(2) (a-TiO(2)) with the intent to build a CdS/Ag/a-TiO(2) catalyst with highly selective oxidation activity. When rhoda...

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Autores principales: Liang, Huijun, Liu, Shengnan, Zhang, Hucheng, Wang, Xiaobing, Wang, Jianji
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9079813/
https://www.ncbi.nlm.nih.gov/pubmed/35542526
http://dx.doi.org/10.1039/c8ra01810c
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author Liang, Huijun
Liu, Shengnan
Zhang, Hucheng
Wang, Xiaobing
Wang, Jianji
author_facet Liang, Huijun
Liu, Shengnan
Zhang, Hucheng
Wang, Xiaobing
Wang, Jianji
author_sort Liang, Huijun
collection PubMed
description Rhodamine B (RhB) has often been used as a model pollutant, but its photocatalytic mechanism is still controversial. Herein, Ag NPs were sandwiched between CdS QDs and amorphous-TiO(2) (a-TiO(2)) with the intent to build a CdS/Ag/a-TiO(2) catalyst with highly selective oxidation activity. When rhodamine B (RhB) was used as the model organic compound, the CdS/Ag/a-TiO(2) composite can not only modulate radical generation but also improve the conversion ratio of RhB to rhodamine 110 (Rh-110) to as high as 82% at 80 min during the visible-light irradiation. A series of the radical scavenging experiments revealed that CdS/Ag/a-TiO(2) composites could modulate the effects of hydroxyl radicals (·OH) and superoxide anion radicals (·O(2)(−)) at different reaction stages so that the overoxidation of RhB and Rh-110 were repressed. Therefore, the transient state protection mechanism of selective oxidation of RhB was proposed to explain the reaction selectivity for Rh-110. Although the effects of both ·O(2)(−) and ·OH are important during the photocatalytic selective oxidation of RhB, it is shown that the selective oxidation of RhB would be performed when the effect of ·O(2)(−) is bigger than the ·OH, if not, RhB would be oxidized unselectively. Meanwhile, this may provide a new strategy for modulating radical generation in the photocatalysis of water phases.
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spelling pubmed-90798132022-05-09 New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation Liang, Huijun Liu, Shengnan Zhang, Hucheng Wang, Xiaobing Wang, Jianji RSC Adv Chemistry Rhodamine B (RhB) has often been used as a model pollutant, but its photocatalytic mechanism is still controversial. Herein, Ag NPs were sandwiched between CdS QDs and amorphous-TiO(2) (a-TiO(2)) with the intent to build a CdS/Ag/a-TiO(2) catalyst with highly selective oxidation activity. When rhodamine B (RhB) was used as the model organic compound, the CdS/Ag/a-TiO(2) composite can not only modulate radical generation but also improve the conversion ratio of RhB to rhodamine 110 (Rh-110) to as high as 82% at 80 min during the visible-light irradiation. A series of the radical scavenging experiments revealed that CdS/Ag/a-TiO(2) composites could modulate the effects of hydroxyl radicals (·OH) and superoxide anion radicals (·O(2)(−)) at different reaction stages so that the overoxidation of RhB and Rh-110 were repressed. Therefore, the transient state protection mechanism of selective oxidation of RhB was proposed to explain the reaction selectivity for Rh-110. Although the effects of both ·O(2)(−) and ·OH are important during the photocatalytic selective oxidation of RhB, it is shown that the selective oxidation of RhB would be performed when the effect of ·O(2)(−) is bigger than the ·OH, if not, RhB would be oxidized unselectively. Meanwhile, this may provide a new strategy for modulating radical generation in the photocatalysis of water phases. The Royal Society of Chemistry 2018-04-11 /pmc/articles/PMC9079813/ /pubmed/35542526 http://dx.doi.org/10.1039/c8ra01810c Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Liang, Huijun
Liu, Shengnan
Zhang, Hucheng
Wang, Xiaobing
Wang, Jianji
New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation
title New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation
title_full New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation
title_fullStr New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation
title_full_unstemmed New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation
title_short New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation
title_sort new insight into the selective photocatalytic oxidation of rhb through a strategy of modulating radical generation
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9079813/
https://www.ncbi.nlm.nih.gov/pubmed/35542526
http://dx.doi.org/10.1039/c8ra01810c
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