Grinding-assisted heterogeneous nucleation of BiOAc on MoS2 nanoflowers to heterojunction with good visible-light photocatalytic performance--颗粒学报PARTICUOLOGY

Liu, H., Han, Q., Jia, X., & Shen, Z. (2021). Grinding-assisted heterogeneous nucleation of BiOAc on MoS2 nanoflowers to heterojunction with good visible-light photocatalytic performance. Particuology, 56, 132-141. https://doi.org/10.1016/j.partic.2020.10.006

Grinding-assisted heterogeneous nucleation of BiOAc on MoS2 nanoflowers to heterojunction with good visible-light photocatalytic performance

Huanzhen Liu, Qiaofeng Han ^*, Xuemei Jia, Zichen Shen

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China

10.1016/j.partic.2020.10.006

Volume 56, June 2021, Pages 132-141

Received 26 May 2020, Revised 26 September 2020, Accepted 1 October 2020, Available online 24 November 2020, Version of Record 8 March 2021.

E-mail: hanqiaofeng@njust.edu.cn

Highlights

• Flower-like MoS₂ microstructures were prepared by dispersing MoS₂ nanosheets.

• MoS₂/BiOAc heterojunctions were constructed using a green grinding method.

• Mechanical force ensured intimate interfacial contact between MoS₂ and BiOAc.

• MoS₂/BiOAc displayed excellent photocatalytic activity for MG, MB, and TC removal.

Abstract

Bismuth oxide subacetate (CH₃COO(BiO); BiOAc) with a large band gap energy (Eg) was first applied as an ultraviolet-light-driven photocatalyst in our group. MoS₂ nanoflowers have been used to improve the visible-light photocatalytic activity of bismuth-based semiconductors with wide E_g because of their good visible-light response. Herein, the grinding-assisted solid-state reaction method was used to prepare a MoS₂/BiOAc composite to improve the visible-light photoreactivity of BiOAc. As compared with commonly used wet chemical and hydrothermal routes, the grinding-assisted synthesis facilitated heterogeneous nucleation, which was beneficial to achieving close contact and subsequent charge transfer and separation at the interfaces, resulting in enhanced photocatalytic activity for malachite green, methylene blue, and antibiotic tetracycline degradation under visible-light irradiation. Notably, the dispersion in the mixing solution of ethanol and water (v/v=1) of MoS₂ nanosheets induced self-assembly into flower-like nanostructures, thus enhancing the photocatalytic activity of MoS₂/BiOAc. A possible mechanism for visible-light photocatalysis of MoS₂/BiOAc was proposed.

Graphical abstract

Keywords

MoS₂/BiOAc; Heterojunction; Grinding; Visible-light photocatalysis

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