Non-radical activation of peroxymonosulfate by iron–chitosan carbonization composites for selective bisphenol A degradation: Focusing on singlet oxygen and iron–oxo species
Year: 2025
Type: article
Abstract: The contaminations of emerging organic contaminants (EOCs) in natural waters pose a serious threat to environmental and public health. Advanced oxidation processes (AOPs) based on non-radical reactive species are considered as the mainstream methods to degrade EOCs. However, the catalysts used for oxidizing agent activation often suffer from elaborate synthesis, poor stability and low selectivity. Herein, a one-pot carbonization of chitosan–FeCl3 complexes was designed to yield Fe/Fe3O4-embedded graphitic carbon (FC900) catalyst. This catalyst was capable of activating peroxymonosulfate (PMS) for selective degradation of bisphenol A (BPA). The FC900/PMS system removed 97.8% BPA within 40 min with a rate constant k of 0.09 min-1, which was nine times faster than that by nano-Fe3O4/PMS. Singlet oxygen and high valent iron-oxo species were identified as the primary intermediators with negligible •OH/SO4-• contribution, demonstrating a non-radical reactive species-dominated degradation process. The system showed excellent anti-interference to the common anions and natural organic matter, and could be recycle used in five cycles. Interestingly, the system posted an oxidant utilization efficiency with 6.52 mg BPA mg-1 PMS, which was highest among the current PMS activator systems. The results will give insight into develop simple, stable and efficient catalyst for EOCs treatment in a complicated environment.
Authors: Yang Li, Yuqing Yu, Youming Diao, Yixi Li, Zihan Xie, Man Chen
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,930
Award: G7268180797
OpenAlex ID: W7083012239