Revisiting the contribution of Fe^ⅣO²⁺ in Fe（Ⅱ）/peroxydisulfate system

作者：Kunjie Hou; Peng Shen; Zhu Wang; Zhoujie Pi; Fei Chen; Xiaoming Li; Haoran Dong; Qi Yang

来源：Chinese Chemical Letters, 2023, 34(03): 210-214.

• Methyl phenyl sulfoxide
• Fe（Ⅱ）/PDS system
• Reactive oxidative species
• FeⅣO2+
• Probe

Recent studies have proposed that the high-valent iron species(such as FeⅣO2+) rather than sulfate radical(SO4·-) and hydroxyl radical（·OH） are the main reactive oxidant species（ROS） in Fe（Ⅱ）/peroxydisulfate（PDS） system with the methyl phenyl sulfoxide（PMSO） as the FeⅣO2+probe.However,many operational factors may interfere with the accuracy of this method,so the contribution of FeⅣO2+ calculated by this method is controversial.In this study,the possible effect of Fe（Ⅱ） concentration,pollutant type,reducing agent,or coexisted anions on FeⅣO2+ production and its corresponding contribution to the removal of target pollutants in the Fe（Ⅱ）/PDS system were investigated in detail,and the intrinsic mechanisms involved were also explored.This study shows that ROS generation is a complex process in the Fe（Ⅱ）/PDS system,and multiple combinatorial approaches are urgently required to deeply explore the contribution of ROS to the elimination of target contaminants.

• 单位
  重庆大学; 湖南大学