Preparation and application of BiOBr-Bi2S3 heterojunctions for efficient photocatalytic removal of Cr(VI)

Zeqing Long; Guangming Zhang; Hongbiao Du; Jia Zhu; Jinwei Li

doi:10.1016/j.jhazmat.2020.124394

Preparation and application of BiOBr-Bi₂S₃ heterojunctions for efficient photocatalytic removal of Cr(VI)

J Hazard Mater. 2021 Apr 5:407:124394. doi: 10.1016/j.jhazmat.2020.124394. Epub 2020 Nov 2.

Authors

Zeqing Long¹, Guangming Zhang², Hongbiao Du³, Jia Zhu⁴, Jinwei Li⁵

Affiliations

¹ School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China. Electronic address: longzq@ruc.edu.cn.
² School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China; School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300130, China. Electronic address: 2020017@hebut.edu.cn.
³ School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China. Electronic address: hbdu@ruc.edu.cn.
⁴ School of Construction and Environment Engineering, Shenzhen Polytechnic, Shenzhen 518055, China. Electronic address: zhujia@szpt.edu.cn.
⁵ School of Construction and Environment Engineering, Shenzhen Polytechnic, Shenzhen 518055, China. Electronic address: lijinwei@szpt.edu.cn.

PMID: 33199146
DOI: 10.1016/j.jhazmat.2020.124394

Abstract

Recently, the photocatalytic reduction of Cr(VI) has been extensively studied. Herein, we successfully prepared the BiOBr-Bi₂S₃ heterojunctions with high photocatalytic Cr(VI) reduction performance using an ion exchange method. The optimal BiOBr-Bi₂S₃ heterojunction (prepared with BiOBr, pH of 6.0, 2 mmol Na₂S₂O₃·5H₂O,) achieved 100% removal of Cr(VI) within 12 min. The performance of photo-reduced Cr(VI) was about 28.9 and 184.6 times higher than that of pure Bi₂S₃ and BiOBr, respectively. Besides, BiOBr-Bi₂S₃ heterojunctions had a good adsorption efficiency for Cr(III), suggesting that they could be applied as bifunctional photocatalyst. The formation process and photoelectric properties of the BiOBr-Bi₂S₃ heterojunctions were revealed by a series of characterizations. In conclusion, this work reported the synergistic effect of adsorption and photocatalysis of the BiOBr-Bi₂S₃ heterojunctions for Cr removal for the first time, suggesting that the BiOBr-Bi₂S₃ heterojunctions could act as a novel photocatalytic adsorbent to treat the Cr(VI)-containing wastewater.

Keywords: Bi(2)S(3); BiOBr; Environmental purification; Hazardous substance; Heterojunction; Hexavalent chromium; Photocatalyst.

Publication types

Research Support, Non-U.S. Gov't