Self-Assembly of Bi2Sn2O7/β-Bi2O3 S-Scheme Heterostructures for Efficient Visible-Light-Driven Photocatalytic Degradation of Tetracycline

Baikang Zhu; Qinbin Dong; Jianghua Huang; Mengmeng Yang; Xianlei Chen; Chunyang Zhai; Qingguo Chen; Bohong Wang; Hengcong Tao; Li Chen

doi:10.1021/acsomega.2c07899

Self-Assembly of Bi₂Sn₂O₇/β-Bi₂O₃ S-Scheme Heterostructures for Efficient Visible-Light-Driven Photocatalytic Degradation of Tetracycline

ACS Omega. 2023 Apr 6;8(15):13702-13714. doi: 10.1021/acsomega.2c07899. eCollection 2023 Apr 18.

Authors

Baikang Zhu^{1

2}, Qinbin Dong¹, Jianghua Huang¹, Mengmeng Yang¹, Xianlei Chen³, Chunyang Zhai⁴, Qingguo Chen¹, Bohong Wang¹, Hengcong Tao^{1

2}, Li Chen⁵

Affiliations

¹ School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316022, China.
² National and Local Joint Engineering Research Center of Harbor Oil & Gas Storage and Transportation Technology, Zhoushan 316022, China.
³ Zhoushan Institute of Calibration and Testing for Quality and Technology Supervision, Zhoushan, Zhejiang 316000, China.
⁴ School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315021, China.
⁵ Department of General Practice, First Medical Center, Chinese PLA General Hospital, Beijing 100036, China.

Abstract

Fabrication of S-scheme heterojunctions with enhanced redox capability offers an effective approach to address environmental remediation. In this study, high-performance Bi₂Sn₂O₇/β-Bi₂O₃ S-scheme heterojunction photocatalysts were fabricated via the in situ growth of Bi₂Sn₂O₇ on β-Bi₂O₃ microspheres. The optimized Bi₂Sn₂O₇/β-Bi₂O₃ (BSO/BO-0.4) degradation efficiency for tetracycline hydrochloride was 95.5%, which was 2.68-fold higher than that of β-Bi₂O₃. This improvement originated from higher photoelectron-hole pair separation efficiency, more exposed active sites, excellent redox capacity, and efficient generation of ^·O₂ ^- and ^·OH. Additionally, Bi₂Sn₂O₇/β-Bi₂O₃ exhibited good stability against photocatalytic degradation, and the degradation efficiency remained >89.7% after five cycles. The photocatalytic mechanism of Bi₂Sn₂O₇/β-Bi₂O₃ S-scheme heterojunctions was elucidated. In this study, we design and fabricate high-performance heterojunction photocatalysts for environmental remediation using S-scheme photocatalysts.