Performance and mechanism of tetracycline removal by peroxymonosulfate-assisted double Z-scheme LaFeO3/g-C3N4/ZnO heterojunction under visible light drive
Year: 2025
Type: article
Abstract: The photocatalytic persulfate activation technology has attracted attention due to the synergistic effect that can be generated by the coupling of photocatalysis and persulfate. In this study, a ternary heterostructure LaFeO 3 /g-C 3 N 4 /ZnO was successfully formed, and a coupled photocatalytic/PMS system was constructed. The coupled system exhibited synergistic effect and achieved high tetracycline removal efficiency and quick kinetic, as 85.89 % tetracycline was degraded within 40 min. Additionally, the coupled system has a wider pH adaptation range and can better resist the influence of coexisting ions (Cl − , CO 3 2 − ) and humic acid. Mechanism investigation indicated that the double-Z scheme heterojunction between LaFeO 3 , g-C 3 N 4 and ZnO provides driving force for charge transfer and improves the separation of photogenerated electron-hole pairs, and PMS can act as an electron acceptor to prevent photogenerated electron hole recombination. • SO 4 − , • OH, • O 2 − , h + , and 1 O 2 work together in photocatalysis/PMS coupled system, with • OH and • SO 4 − play a major role. Compared to solo photocatalytic system, the toxicity of tetracycline degradation intermediate products is lower and the mineralization degree of tetracycline is higher in the coupled system. Besides, LaFeO 3 /g-C 3 N 4 /ZnO also exhibiting superior photocatalytic performance after four cycles. This work provides reference for photocatalytic persulfate activation technology to degrade tetracycline in water.
Authors: Jie Wang, Jiahua Zhang, Guofeng Cheng, Kai Zhang, Xingguo Liu
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,930
OpenAlex ID: W4410816638