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Issue 26, 2020
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One-step hydrothermal fabrication of SrMoO4/MoS2 composites with strong interfacial contacts for efficient photoreduction removal of Cr(vi)

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Abstract

Aimed at alleviating severe recombination of photogenerated electron/hole pairs in MoS2 photocatalysts, one-pot hydrothermal preparation of SrMoO4/MoS2 composites was successfully achieved in this study. It was found that numerous MoS2 nanosheets were in situ grown on the surface of bulk SrMoO4; meanwhile, XPS and Raman analyses indicated that a strong interfacial effect was generated between bulk SrMoO4 and MoS2 nanosheets in 8%-SrMoO4/MoS2 composites. Moreover, the intense heterojunction interface of 8%-SrMoO4/MoS2 composites greatly promotes the separation of photoinduced electron–hole pairs and speeds up the transfer of photoinduced charge carriers. Compared with pure MoS2 and bulk SrMoO4 photocatalysts, the series of x-SrMoO4/MoS2 composites possess enhanced photoreduction activities, especially the 8%-SrMoO4/MoS2 photocatalyst displays optimal removal efficiency of Cr(VI) (91.2%) and excellent photostability under visible light irradiation. As a matter of fact, an in situ hybrid process occurs during the preparation of 8%-SrMoO4/MoS2 composites, resulting in intense interfacial contacts, which mainly endow them with superior photocatalytic performance. Finally, the photocatalytic mechanism is studied to illustrate the efficient transfer of photoinduced electron/hole pairs and the removal process of Cr(VI).

Graphical abstract: One-step hydrothermal fabrication of SrMoO4/MoS2 composites with strong interfacial contacts for efficient photoreduction removal of Cr(vi)

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Article information


Submitted
02 Mar 2020
Accepted
30 May 2020
First published
04 Jun 2020

CrystEngComm, 2020,22, 4489-4499
Article type
Paper

One-step hydrothermal fabrication of SrMoO4/MoS2 composites with strong interfacial contacts for efficient photoreduction removal of Cr(VI)

Y. Zhang, X. Yang, P. Zhang, D. Liu, Y. Wang, Z. Jin, B. B. Mamba, A. T. Kuvarega and J. Gui, CrystEngComm, 2020, 22, 4489
DOI: 10.1039/D0CE00314J

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