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Issue 48, 2017
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C–S bond induced ultrafine SnS2 dot/porous g-C3N4 sheet 0D/2D heterojunction: synthesis and photocatalytic mechanism investigation

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Abstract

The construction of novel heterojunctions is precisely deemed to be an effective strategy to facilitate photo-generated carrier separation and boost charge utilization efficiency, leading to much enhanced photocatalytic activities. Herein, in situ of growing ultrafine SnS2 nanoparticles on a porous g-C3N4 sheet (SnS2/g-C3N4) 0D/2D heterojunction was achieved via a low-temperature solvothermal process. Combined with various characterization techniques, it is revealed that SnS2 dots with a diameter of 3 nm distribute evenly on the surface of the g-C3N4 substrate with strong C–S bonds. The photocatalytic activities are evaluated by the degradation of Rhodamine B (RhB) under visible light irradiation, showing a much enhanced photodegradation efficiency of 96.8% over 105 min irradiation and an enhanced reaction rate constant (k = 3.3% min−1, 8.25 and 8.05 times that of pure g-C3N4 and SnS2). The improved photocatalytic activities could be ascribed to the efficient electron–hole separation of porous g-C3N4, which is caused by the ultrafine SnS2 dots linked with the g-C3N4 substrate through C–S bonds. Therefore, the recombination efficiency is decreased. In addition, reactive active species trapping experiments prove that the superoxide radical (˙O2) and holes (h+) are the main active species in this photocatalytic system. The photodegradation mechanism of the SnS2/g-C3N4 heterojunction is analyzed and demonstrated in detail.

Graphical abstract: C–S bond induced ultrafine SnS2 dot/porous g-C3N4 sheet 0D/2D heterojunction: synthesis and photocatalytic mechanism investigation

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Publication details

The article was received on 16 Oct 2017, accepted on 16 Nov 2017 and first published on 17 Nov 2017


Article type: Paper
DOI: 10.1039/C7DT03894A
Citation: Dalton Trans., 2017,46, 17032-17040
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    C–S bond induced ultrafine SnS2 dot/porous g-C3N4 sheet 0D/2D heterojunction: synthesis and photocatalytic mechanism investigation

    A. Zhu, L. Qiao, Z. Jia, P. Tan, Y. Liu, Y. Ma and J. Pan, Dalton Trans., 2017, 46, 17032
    DOI: 10.1039/C7DT03894A

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