UM
Carbon Dot-SnS 2 Heterojunction Photocatalyst for Photoreduction of Cr(VI) under Visible Light: A Combined Experimental and First-Principles DFT Study
Han L.1; Zhong Y.-L.4; Lei K.3; Mao D.1; Dong Y.-Z.1; Hong G.4; Zhou Y.-T.2; Fang D.1
2019-01-31
Source PublicationJournal of Physical Chemistry C
ISSN19327455 19327447
Volume123Issue:4Pages:2398-2409
AbstractThe use of solar energy to convert highly toxic Cr(VI) into hypotoxic Cr(III) is an attractive strategy to address heavy metal pollution. In this work, a facile method for the preparation of carbon nanodot-SnS nanocomposites (SnSCD) is reported. In this system, CDs serve as excellent photosensitizers in combination with SnS . The photogenerated electrons produced by the conduction band of SnS could be easily injected into the CDs, which suppress the charge recombination, and thus show improved photocatalytic activity. Meanwhile, the SnSCD-5 sample with a CD content of 5 wt % showed the highest catalytic activity in the photocatalytic removal of Cr(VI) under visible light. The total Cr(VI) removal rate and the reaction kinetic coefficient of the SnSCD-5 photocatalyst were found to be 77.34% and 6.95 min , respectively. These values were 4.15 and 6.56 times higher than pure SnS , respectively. Furthermore, the high stability and durability of SnSCD-5 were demonstrated by three cycling experiments. The first-principles density functional theory calculations were performed to study the energy band and electron-hole density distribution of SnS and SnSCD photocatalysts. The calculation results were consistent with our experimental results, it further confirms that CDs play a vital role in this system. In general, this study highlights the highly efficient charge transfer and separation and the potential application of the SnSCD photocatalyst in the removal of Cr(VI).
DOI10.1021/acs.jpcc.8b10059
URLView the original
Language英語
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Cited Times [WOS]:6   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Yancheng Teachers University
2.Zhejiang Ocean University
3.Nanjing Tech University
4.Universidade de Macau
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Han L.,Zhong Y.-L.,Lei K.,et al. Carbon Dot-SnS 2 Heterojunction Photocatalyst for Photoreduction of Cr(VI) under Visible Light: A Combined Experimental and First-Principles DFT Study[J]. Journal of Physical Chemistry C,2019,123(4):2398-2409.
APA Han L..,Zhong Y.-L..,Lei K..,Mao D..,Dong Y.-Z..,...&Fang D..(2019).Carbon Dot-SnS 2 Heterojunction Photocatalyst for Photoreduction of Cr(VI) under Visible Light: A Combined Experimental and First-Principles DFT Study.Journal of Physical Chemistry C,123(4),2398-2409.
MLA Han L.,et al."Carbon Dot-SnS 2 Heterojunction Photocatalyst for Photoreduction of Cr(VI) under Visible Light: A Combined Experimental and First-Principles DFT Study".Journal of Physical Chemistry C 123.4(2019):2398-2409.
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