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On different photodecomposition behaviors of rhodamine B on laponite and montmorillonite clay under visible light irradiation
Joint Authors
Wang, Peng
Cheng, Mingming
Zhang, Zhonghai
Source
Journal of Saudi Chemical Society
Issue
Vol. 18, Issue 4 (30 Sep. 2014), pp.308-316, 9 p.
Publisher
Publication Date
2014-09-30
Country of Publication
Saudi Arabia
No. of Pages
9
Main Subjects
Abstract EN
In this study, laponite and montmorillonite clays were found to be able to decompose rhodamine B upon visible light irradiation (k> 420 nm).
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 HO 2=O 2 while montmorillonite involving 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 HO 2 relative to O 2 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.
American Psychological Association (APA)
Wang, Peng& Cheng, Mingming& Zhang, Zhonghai. 2014. On different photodecomposition behaviors of rhodamine B on laponite and montmorillonite clay under visible light irradiation. Journal of Saudi Chemical Society،Vol. 18, no. 4, pp.308-316.
https://search.emarefa.net/detail/BIM-388606
Modern Language Association (MLA)
Wang, Peng…[et al.]. On different photodecomposition behaviors of rhodamine B on laponite and montmorillonite clay under visible light irradiation. Journal of Saudi Chemical Society Vol. 18, no. 4 (Sep. 2014), pp.308-316.
https://search.emarefa.net/detail/BIM-388606
American Medical Association (AMA)
Wang, Peng& Cheng, Mingming& Zhang, Zhonghai. On different photodecomposition behaviors of rhodamine B on laponite and montmorillonite clay under visible light irradiation. Journal of Saudi Chemical Society. 2014. Vol. 18, no. 4, pp.308-316.
https://search.emarefa.net/detail/BIM-388606
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 316
Record ID
BIM-388606