Work

NiFe-LDH modified biochar enhances peroxymonosulfate activation system: Mechanism for singlet oxygen (1O2) generation and tetracycline degradation

Year: 2025

Type: article

Abstract: The effect of biochar (BC) on reactive oxygen species (ROS) within the peroxymonosulfate (PMS) activation system remains unclear. In this study, NiFe-LDH modified BC (NiFe-LDH/BC) was synthesized to evaluate the influence of BC on ROS generation. The characterization results demonstrated that the incorporation of BC effectively enhanced the content of oxygen vacancies, which contributed to the activation of PMS. Importantly, BC facilitated the reduction of Fe(III) and Ni(III), while regulating the formation pathway of singlet oxygen (1O2). The ROS intermediates transformed from ·O2- to ·OH/SO4·-. Then, a greater amount of 1O2 was generated in the system of NiFe-LDH/BC/PMS. The stability and catalytic activity of NiFe-LDH/BC exhibited a significant enhancement compared to those of NiFe-LDH. The degradation mechanism and pathway of tetracycline were identified through DFT calculations and mass spectrometry detection. Meanwhile, NiFe-LDH/BC demonstrated excellent recyclability and anti-interference performance in real water bodies. Our findings would provide novel ideas to design and utilize BC-based catalytic materials to activate PMS for environmental remediation.

Source: Journal of environmental chemical engineering

DOI: 10.1016/j.jece.2025.116507