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

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    Type
    Article
    Authors
    Wang, Peng cc
    Cheng, Mingming
    Zhang, Zhonghai cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Nanotechnology Lab
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2013-12-11
    Online Publication Date
    2013-12-11
    Print Publication Date
    2014-09
    Permanent link to this record
    http://hdl.handle.net/10754/552389
    
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    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.
    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
    DOI
    10.1016/j.jscs.2013.11.006
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S1319610313001191
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jscs.2013.11.006
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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