首页|Heterojunction nanoarchitectonics with SnS2/g-C3N4 S-scheme toward enhanced photooxidation and photoreduction
Heterojunction nanoarchitectonics with SnS2/g-C3N4 S-scheme toward enhanced photooxidation and photoreduction
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Novel g-C3N4/SnS2 van der Waals heteroj unctions were fabricated via SnS2 crystals embedded superior thin g-C3N4 nanosheets for efficient photocatalytic oxidation and reduction activities simultaneously. S-scheme charge migration path was confirmed through test and density functional theory (DFT) calculation. Two dimensional (2D)/2D interfaces, powerful internal electric field (IEF) and band bending effect together expedited charge transfer. Photocatalytic removal of organic pollutants and hydrogen evolution were employed to evaluate photocatalytic performance. Particularly, the g-C3N4/SnS2 heterojunctions exhibited excellent 2,4-dichlorophenol (2,4-DCP) photooxidation and Cr(VI) photoreduction activities at the same time. 85% of Cr(VI) and 94% of 2,4-DCP were removed in the mixed solution after visible light irradiation for 2h(λ> 420 nm). The hydrogen evolution rate enhanced to ~6.58 times of g-C3N4. DFT simulation matched with test for narrowed band gap and enhanced IEF (accelerating photogenerated carrier transfer). This work provided new insights for constructing S-scheme multifunctional g-C3N4-based photocatalyst.
g-C3N4/SnS2S-schemeHeterojunctionPhotocatalysis
Tong Song、Xiao Zhang、Quande Che
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School of Material Science and Engineering, University of Jinan, Jinan 250022, PR China
W/A School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Perth, WA 6845, Australia
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