Step-doped disulfide vacancies and functional groups synergistically enhance photocatalytic activity of S-scheme Cu3SnS4/L-BiOBr towards ciprofloxacin degradation

Zhihong Li; Danquan Lan; Zuji Li; Jiangli Sun; Shuo Chen; Jinhang Yang; Jingwen Wei; Zebing Yu; Shuangfei Wang; Yanping Hou

doi:10.1016/j.chemosphere.2022.134684

Step-doped disulfide vacancies and functional groups synergistically enhance photocatalytic activity of S-scheme Cu₃SnS₄/L-BiOBr towards ciprofloxacin degradation

Chemosphere. 2022 Aug:301:134684. doi: 10.1016/j.chemosphere.2022.134684. Epub 2022 Apr 23.

Authors

Zhihong Li¹, Danquan Lan¹, Zuji Li¹, Jiangli Sun¹, Shuo Chen¹, Jinhang Yang¹, Jingwen Wei¹, Zebing Yu², Shuangfei Wang³, Yanping Hou⁴

Affiliations

¹ School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China.
² School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China; Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Nanning, 530004, China.
³ College of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, China; Guangxi Bossco Environmental Protection Technology Co, Ltd, 12 Kexin Road, Nanning, 530007, China Technology for Non-ferrous, China.
⁴ School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China; Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Nanning, 530004, China. Electronic address: houyp@gxu.edu.cn.

PMID: 35472610
DOI: 10.1016/j.chemosphere.2022.134684

Abstract

Development of efficient photocatalysts for efficient recalcitrant organic pollutants degradation is of great significance. Herein, the step-doped disulfide vacancies S-scheme Cu₃SnS₄/L-BiOBr (CTS/L-BiOBr) heterojunction photocatalyst was prepared for ciprofloxacin (CIP) degradation. X-ray photoelectron spectroscopy (XPS) analysis, ultraviolet photo-electron spectroscopy (UPS) analysis, band structure and dominant radicals' identification together verified that the transfer of photogenerated carriers conformed to the S-scheme mechanism. Benefited from the interfacial electric field (IEF) of the S-scheme heterojunction and incorporation of L-cysteine with introducing S-vacancies and surface functional groups (-NH₂, -COO^-), photogenerated charges generation and separation of the CTS/L-BiOBr₍₁₀₎ were greatly improved. With ·OH and h⁺ as dominant reactive species, CIP removal reached 93% using CTS/L-BiOBr₍₁₀₎ within 180 min of visible light irradiation, which was 3.5 times and 2.6 times of pristine Cu₃SnS₄ and L-BiOBr, respectively. Moreover, possible CIP degradation pathways were proposed and the degradation intermediates ecotoxicity were evaluated. This study could provide reference for designing efficient S-scheme photocatalysts for recalcitrant wastewater treatment.

Keywords: Carriers' transfer; Ciprofloxacin degradation pathways; Functional groups; S-scheme Cu(3)SnS(4)/L-BiOBr heterojunction; S-vacancy.

MeSH terms

Bismuth / chemistry
Catalysis
Ciprofloxacin*
Disulfides*

Substances

Disulfides
Ciprofloxacin
bismuth oxybromide
Bismuth