Heat enhanced bisphenol AF degradation in CoFe2O4@BC activated peroxymonosulfate process: Mechanism and the role of inorganic anions
Jiawei Li, Zonghao Liu, Yan Zhao, Chenbin Lin, Chengye Song, Zejian Zhi, Shaofeng Wang, Chaoqun Tan, Min Song
Abstract
Carbon-based materials and heat activated peroxymonosulfate (PMS) have emerged as promising technologies for the remediation of contaminated water. This study investigated the feasibility of Bisphenol AF (BPAF) degradation by coupling CoFe 2 O 4 @BC catalyst with heat activated PMS technology. Heat significantly enhanced the catalytic performance of CoFe 2 O 4 @BC for PMS activation, resulting in 87.0 % removal of BPAF. Meanwhile, the effects of PMS concentration, CoFe 2 O 4 @BC catalyst dosage, initial pH, and the inorganic anions on BPAF degradation were investigated. The presence of HCO 3 − and HPO 4 2− were found to enhance BPAF degradation by promoting PMS decomposition, while humic acid (HA) significantly inhibited BPAF removal. Electron paramagnetic resonance (EPR) and quenching experiments suggested that sulfate radicals (SO 4 • − ) were the dominant reactive oxygen species (ROS) in the system, with hydroxyl radicals (•OH) and singlet oxygen ( 1 O 2 ) also contributing to BPAF degradation. Based on the Density Functional Theory (DFT) and intermediates analysis, two degradation pathways of BPAF were proposed, including hydroxylation and β-scission reactions. This work reveals the underlying mechanism of PMS activation under the coupling of heat with the CoFe 2 O 4 @BC system and presents a potential method for contaminants decomposition.