On different photodecomposition behaviors of rhodamine B on laponite and montmorillonite clay under visible light irradiation

Handle URI:
http://hdl.handle.net/10754/552389
Title:
On different photodecomposition behaviors of rhodamine B on laponite and montmorillonite clay under visible light irradiation
Authors:
Wang, Peng ( 0000-0003-0856-0865 ) ; Cheng, Mingming; Zhang, Zhonghai
Abstract:
In this study, laponite and montmorillonite clays were found to be able to decompose rhodamine B upon visible light irradiation (λ&gt;420nm). Very interestingly, it was found that rhodamine B on laponite underwent a stepwise N-deethylation and its decomposition was terminated once rhodamine 110, as a decomposition product, was formed, whereas the same phenomenon was not observed for rhodamine B on montmorillonite, whose decomposition involved chromophore destruction. Mechanistic study revealed that the different photodecomposition behaviors of rhodamine B on laponite and montmorillonite were attributed to the oxidation by different reactive oxygen species, with laponite involving HO2/O2- while montmorillonite involving <sup/>OH. It was also found that the degradation pathway of rhodamine B on laponite switched from N-deethylation to chromophore destruction when solution pH was changed from 7.0 to 3.0, which was attributed to a much higher fraction of HO2 relative to O2- under pH 3.0 than under pH 7.0. Based on the results, a mechanism of rhodamine dye decomposition on clay under visible light was proposed, involving the clay as an electron acceptor, electron relay between the adsorbed dye molecules and oxygen molecules, and subsequent reactions between the generated dye radical cations and different reactive oxygen species. The results of this study shed light on how to best utilize visible light for organic pollutant degradation on clays within engineered treatment systems as well as on many of naturally occurring pollutant degradation processes in soils and air involving clay. © 2013 King Saud University.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division
Citation:
On different photodecomposition behaviors of rhodamine B on laponite and montmorillonite clay under visible light irradiation 2014, 18 (4):308 Journal of Saudi Chemical Society
Publisher:
Elsevier BV
Journal:
Journal of Saudi Chemical Society
Issue Date:
11-Dec-2013
DOI:
10.1016/j.jscs.2013.11.006
Type:
Article
ISSN:
13196103
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S1319610313001191
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorWang, Pengen
dc.contributor.authorCheng, Mingmingen
dc.contributor.authorZhang, Zhonghaien
dc.date.accessioned2015-05-06T13:31:57Zen
dc.date.available2015-05-06T13:31:57Zen
dc.date.issued2013-12-11en
dc.identifier.citationOn different photodecomposition behaviors of rhodamine B on laponite and montmorillonite clay under visible light irradiation 2014, 18 (4):308 Journal of Saudi Chemical Societyen
dc.identifier.issn13196103en
dc.identifier.doi10.1016/j.jscs.2013.11.006en
dc.identifier.urihttp://hdl.handle.net/10754/552389en
dc.description.abstractIn this study, laponite and montmorillonite clays were found to be able to decompose rhodamine B upon visible light irradiation (λ&gt;420nm). Very interestingly, it was found that rhodamine B on laponite underwent a stepwise N-deethylation and its decomposition was terminated once rhodamine 110, as a decomposition product, was formed, whereas the same phenomenon was not observed for rhodamine B on montmorillonite, whose decomposition involved chromophore destruction. Mechanistic study revealed that the different photodecomposition behaviors of rhodamine B on laponite and montmorillonite were attributed to the oxidation by different reactive oxygen species, with laponite involving HO2/O2- while montmorillonite involving <sup/>OH. It was also found that the degradation pathway of rhodamine B on laponite switched from N-deethylation to chromophore destruction when solution pH was changed from 7.0 to 3.0, which was attributed to a much higher fraction of HO2 relative to O2- under pH 3.0 than under pH 7.0. Based on the results, a mechanism of rhodamine dye decomposition on clay under visible light was proposed, involving the clay as an electron acceptor, electron relay between the adsorbed dye molecules and oxygen molecules, and subsequent reactions between the generated dye radical cations and different reactive oxygen species. The results of this study shed light on how to best utilize visible light for organic pollutant degradation on clays within engineered treatment systems as well as on many of naturally occurring pollutant degradation processes in soils and air involving clay. © 2013 King Saud University.en
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S1319610313001191en
dc.rightsArchived with thanks to Journal of Saudi Chemical Society. http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectClayen
dc.subjectRhodamine Ben
dc.subjectPhotocatalysisen
dc.subjectVisible lighten
dc.titleOn different photodecomposition behaviors of rhodamine B on laponite and montmorillonite clay under visible light irradiationen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalJournal of Saudi Chemical Societyen
dc.eprint.versionPublisher's Version/PDFen
kaust.authorWang, Pengen
kaust.authorCheng, Mingmingen
kaust.authorZhang, Zhonghaien
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