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New Insights into the FeO/Peroxymonosulfate Process for Organics Removal: The Synergistic Effect of Radicals and Fe(IV)
journal contributionposted on 2023-09-11, 07:05 authored by Baitian Zeng, Liying Long, Yiqun Chen, Zizheng Liu, Liting Luo, Qing Shao, Pengchao Xie, Jun Ma
The FeO/peroxymonosulfate (PMS) system was explored in this work for the removal of bisphenol A (BPA) as a target pollutant. FeO demonstrated the highest PMS activation ability among the common iron oxides. 95.4% of the BPA could be removed in 30 min at pH 4.0 with the addition of 300 mg/L FeO and 50 μM PMS, mostly due to heterogeneous catalysis. The coexisting inorganic anions and natural organic matter impacted BPA breakdown. In the FeO/PMS system, high-valent Fe(IV), SO4•–, and HO• were produced, which collectively caused the hydroxylation of the benzene ring in the BPA molecule. Remarkably, these reactive species had distinct effects on eliminating substrates, with electron-rich pollutants more likely to experience electrophilic reactions with Fe(IV) and electron-deficient pollutants more susceptible to HO• attack. Compared to other FeO/peroxide systems, the FeO/PMS system had a better oxidation capacity under the experimental conditions, and it continued to function effectively in real water. Additionally, in a 96 h continuous flow treatment, the FeO/PMS system demonstrated a sustained effect. As a result, this system is anticipated to be a successful advanced oxidation technique for eliminating organic micropollutants existing in water.
sup >• supexperience electrophilic reactionscommon iron oxidescoexisting inorganic anionsbetter oxidation capacity50 μm pmspms system demonstratedpms systemfeo demonstratedtarget pollutantsynergistic effectsustained effectrich pollutantsreactive speciesperoxide systemsnew insightsmostly dueheterogeneous catalysisfunction effectivelyexperimental conditionseliminating substratesdistinct effectsdeficient pollutantscollectively causedbenzene ring300 mg30 min