0-Dimensional/1-dimensional S-scheme Ag2S/BiSI hetero-structured photocatalyst for superb Cr(VI) reduction under full spectrum irradiation

Chun Xiao; Zhuangzhuang Wang; Mingyu Zhang; Min Dai; Jiangfei Cao; Chunsheng Xie; Jun Li

doi:10.1016/j.jcis.2024.11.253

0-Dimensional/1-dimensional S-scheme Ag₂S/BiSI hetero-structured photocatalyst for superb Cr(VI) reduction under full spectrum irradiation

J Colloid Interface Sci. 2025 Mar 15:682:619-628. doi: 10.1016/j.jcis.2024.11.253. Epub 2024 Dec 2.

Authors

Chun Xiao¹, Zhuangzhuang Wang², Mingyu Zhang³, Min Dai¹, Jiangfei Cao¹, Chunsheng Xie⁴, Jun Li⁵

Affiliations

¹ College of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, PR China; Guangdong Provincial Key Laboratory of Eco-environmental Studies and Low-carbon Agriculture in Peri-urban Arease, Zhaoqing University, Zhaoqing 526061, PR China.
² Petrochemical New Materials Joint Laboratory, Maoming Green Chemical Industry Research Institute, Maoming 525030, PR China.
³ China Tobacco Hubei Industrial LLC, Wuhan 430048, PR China.
⁴ College of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, PR China; Guangdong Provincial Key Laboratory of Eco-environmental Studies and Low-carbon Agriculture in Peri-urban Arease, Zhaoqing University, Zhaoqing 526061, PR China. Electronic address: xiechsh@126.com.
⁵ Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450052, PR China. Electronic address: junli2019@zzu.edu.cn.

PMID: 39642548
DOI: 10.1016/j.jcis.2024.11.253

Abstract

Developing ultraviolet (UV), visible (Vis) and near-infrared (NIR) responsive photocatalysts for Cr(VI) reduction is valuable. Herein, a 0-dimensional/1-dimensional (0D/1D) S-scheme Ag₂S/BiSI hetero-structured photocatalyst was successfully synthesized, which displays greatly enhanced Cr(VI) removal activity either under UV, Vis or NIR light irradiation. In-situ characterization technique and theoretical calculation confirm that an internal electric field (IEF), directing from Ag₂S to BiSI, exists between the interface, which facilitates the spatial-oriented separation of photoirradiated carriers. Furthermore, the immobilization of Cr₂O₇^2- and the transformation from *Cr₂O₇^2- to *CrO₃H₂ on the surface of S-scheme Ag₂S/BiSI heterostructure is much more favorable than that on the surface of single Ag₂S or BiSI. This work gives a comprehensive insight on the design of full spectrum responsive S-scheme photocatalysts for heavy metal removal.

Keywords: 0D/1D S-scheme; Ag(2)S/BiSI; Cr(VI) reduction; Full spectrum.