Synergy between Iron and Selenide on FeSe2(111) Surface Driving Peroxymonosulfate Activation for Efficient Degradation of Pollutants

• DOI: 10.1021/acs.est.0c06091
• Publication Date: 2020-11-18T19:22:41Z
• Authors: Guodong Fang; Teng Zhang; Hongbiao Cui; Dionysios D. Dion...; Cun Liu; Juan Gao; Yujun Wang; Dongmei Zhou
• Keywords: Peroxydisulfate; Selenide; Degradation

In this study, iron selenide nanoparticles (FeSe2) were synthesized and applied in Fenton-like reactions for degradation of pollutants. It was found that FeSe2 exerts excellent catalytic reactivity toward different oxidants including peroxymonosulfate (PMS), peroxydisulfate, H2O2, which can degrade a wide range pollutants such as 2,4,4′-trichlorobiphenyl, bisphenol A, sulfamethoxazole, chlortetracycline, perfluorooctanoic acid, with the efficiency TOC removal reaching 55–95 20.3–50.9%, respectively. The mechanism PMS activation by elucidated, synergistic effect between Fe Se discovered to be dominant mechanism, evidenced free-radical quenching, electron paramagnetic resonance, density functional theory studies. Briefly, Fe(II) site on surface (111) accounted activation, while reducing species not only acted an donor contributing regeneration but also produced vacancies further facilitating improve performance activation. addition, exhibited high activity stability pH, PCBs efficiently presence anions, natural organic matter water matrices or complex soil eluents. This study presents development evaluation novel highly efficient activator exhibits promise practical applications wastewater wash eluent reactions.