Liang, ShengShengLiangZhu, LiuyiLiuyiZhuHua, JianJianHuaDuan, WeijianWeijianDuanYang, Puu-TaiPuu-TaiYangSHAN-LI WANGWei, ChaohaiChaohaiWeiLiu, ChengshuaiChengshuaiLiuFeng, ChunhuaChunhuaFeng2021-05-182021-05-182020-05-19https://www.scopus.com/pages/publications/85084915239?inwardhttps://scholars.lib.ntu.edu.tw/handle/123456789/561270The reaction between Fe2+ and HClO constitutes a promising advanced oxidation process (AOP) for removing pollutants from wastewater, and â¢OH has been considered the dominant reactive oxidant despite limited evidence for this. Herein, we demonstrate that the Fe2+/HClO reaction enables the production of FeIVO2+ rather than â¢OH in acid medium, a finding that is strongly supported by multiple lines of evidence. Both X-ray absorption near-edge structure spectroscopic tests and Mössbauer spectroscopic tests confirmed the appearance of FeIVO2+ as the reactive intermediate in the reaction between Fe2+ and HClO. The determination of FeIVO2+ generation was also derived from the methyl phenyl sulfoxide (PMSO)-based probe experiments with respect to the formation of PMSO2 without â¢OH adducts and the density functional theory studies according to the lower energy barrier for producing FeIVO2+ compared with â¢OH. A dual-anode electrolytic system was established for the in situ generation of Fe2+ and HClO that allows the production of FeIVO2+. The system exhibits an enhanced capacity for oxidizing a model pollutant (e.g., phosphite) from industrial wastewater, making it an attractive and promising AOP for the abatement of aqueous contaminants.[SDGs]SDG6[SDGs]SDG7Absorption spectroscopy; Chlorine compounds; Density functional theory; Iodine compounds; Iron compounds; Pollution; Reaction intermediates; X ray absorption; X ray absorption near edge structure spectroscopy; Advanced oxidation process; Advanced Oxidation Processes; Density functional theory studies; Electrolytic system; Industrial wastewaters; Lower energy barriers; Reactive intermediate; X ray absorption near edge structure; Vanadium compounds; ferrous ion; hydroxyl group; hypochlorous acid; magnetite; phosphite; sulfoxide; oxidizing agent; electrode; energy efficiency; industrial waste; iron; oxidation; pollutant removal; reaction kinetics; wastewater treatment; aqueous solution; Article; controlled study; density functional theory; electrolysis; energy; Mossbauer spectroscopy; oxidation; waste water; water pollutant; X ray absorption near edge structure spectroscopy; oxidation reduction reaction; Oxidants; Oxidation-Reduction; Spectroscopy, Mossbauerjournal article10.1021/acs.est.0c00218321578782-s2.0-85084915239WOS:000537151000051