Fe²⁺/HClO Reaction Produces FeᴵⱽO²⁺: An Enhanced Advanced Oxidation Process
Journal
Environmental Science and Technology
Journal Volume
54
Journal Volume
54
Journal Issue
10
Journal Issue
10
Pages
6406-6414
Start Page
6406
End Page
6414
ISSN
0013936X
Date Issued
2020-05-19
Author(s)
Liang, Sheng
Zhu, Liuyi
Hua, Jian
Duan, Weijian
Yang, Puu-Tai
Wei, Chaohai
Liu, Chengshuai
Feng, Chunhua
Abstract
The 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.
Other Subjects
Absorption 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, Mossbauer
Publisher
American Chemical Society
Type
journal article