J. Mater. Sci. Technol. ›› 2024, Vol. 171: 185-197.DOI: 10.1016/j.jmst.2023.07.012

• Research Article • Previous Articles     Next Articles

Assembling S-scheme heterojunction between basic bismuth nitrate and bismuth tungstate with promoting charges' separation for accelerated photocatalytic sulfamethazine degradation

Wenhan Chena, Meng Daia, Li Xiangb, Shan Zhaoa, Shuguang Wanga,c, Zuoli Hea,c,*   

  1. aShandong Key Laboratory of Water Pollution Control and Resource Reuse, Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China;
    bCEDAR, Knight Cancer Institute, School of Medicine, Oregon Health and Science University, Portland, OR 97201, United States;
    cWeihai Research Institute of Industrial Technology of Shandong University, Shandong University, Weihai 264209, China
  • Received:2023-06-19 Revised:2023-07-12 Accepted:2023-07-19 Published:2024-02-01 Online:2023-08-09
  • Contact: *E-mail address: .zlhe@sdu.edu.cn (Z. He)

Abstract: The S-scheme heterojunction has garnered increasing attention due to its remarkable oxidation capacity and efficient separation of photogenerated carriers. In this study, a one-pot glycerol-assisted hydrothermal process was utilized to successfully synthesize S-scheme heterojunction photocatalysts comprising basic bismuth nitrate (BBN) and bismuth tungstate (BWO). Interestingly, the BBN/BWO heterogeneous photocatalysts exhibited the highest photocatalytic properties. The optimized product achieved the degradation of sulfamethazine (SMZ) within 1 h, with a kinetic constant (k) value of 0.05818 min-1. The degradation process was influenced significantly by ·O2- and h+ species. To determine the degradation pathway of SMZ in the presence of BBN/BWO-0.6, liquid chromatography-mass spectrometry (LC-MS) analysis was performed, which revealed a decrease in the toxicity of intermediates and products. The enhanced photocatalytic activity can be attributed to the internal electric field (IEF) of the S-scheme heterojunction between BBN and BWO, effectively promoting the separation of photogenerated carriers. This research presents a viable approach for developing S-scheme heterojunctions in SMZ photodegradation and other environmental applications.

Key words: Photocatalysis, S-scheme, Heterojunction, Bi2WO6, Sulfamethazine