文献类型：期刊文献

英文题名：Molecular oxygen activation by atomic Fe-moieties on MnO2 for enhanced remediation of parachlormetaxylenol wastewater

作者：Xiao, Huiji[1];Zhang, Wenli[1];Zhu, Chenxi[1];Lv, Kewei[2];Wang, Yun[1];Xie, Bing[3];Zou, Xiaoming[1];Luo, Xubiao[1];Zhou, Yanbo[1,2,4]

机构：[1]Jinggangshan Univ, Sch Life Sci, Key Lab Jiangxi Prov Funct Biol & Pollut Control R, Jian 343009, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Coal Liquificat, Gasificat & Utilizat High Efficiency & Low Carbon, Shanghai 200237, Peoples R China;[3]East China Normal Univ, Shanghai Engn Res Ctr Biotransformat Organ Solid W, Sch Ecol & Environm Sci, Shanghai 200241, Peoples R China;[4]East China Univ Sci & Technol, Key Lab Environm Risk Assessment & Control Chem Pr, Minist Ecol & Environm, Shanghai 200237, Peoples R China

年份：2026

卷号：20

期号：6

外文期刊名：ENGINEERING ENVIRONMENT

收录：;EI(收录号：20261420421568);WOS:【SCI-EXPANDED(收录号:WOS:001730747800001)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 52370168), the Jiangxi Provincial Natural Science Foundation, China (No. 20253BAC280127), the Key Laboratory of Functional Biology and Pollution Control in red soil regions of Jiangxi Province, China (No. 2023SSY02051).

语种：英文

外文关键词：Atomic Fe-Mn catalyst; O-2 adsorption and activation; Advanced oxidation processes; Toxicity assessment; Wastewater remediation

摘要：The spin-forbidden effect and high bond energy of molecular oxygen (O-2) pose a fundamental challenge for its activation in wastewater treatment. We address this by constructing an atomically dispersed Fe-Mn dual-site catalyst (Fe-0.1-Mn-350), which overcomes the sluggish O-2 kinetics of monometallic oxides and the aqueous instability of conventional single-atom catalysts. This catalyst enables complete degradation of 20 mg/L parachlormetaxylenol (PCMX) within 15 minutes, with a reaction rate (0.2205 min(-1)) 25 times greater than MnO2 and surpassing benchmark catalysts. Experimental and theoretical analyses reveal that the preferential side-on O-2 adsorption at Fe sites of Fe-0.1-Mn-350 significantly reduces activation barriers by 38% (versus Fe-CNTs by 15%, Co-MnO2 by 25%), and triggers a dual-pathway mechanism involving both radical ((OH)-O-center dot, O-2(center dot-)) and non-radical (O-1(2), Fe(IV)) species. Crucially, the Fe-0.1-Mn-350/O-2 system demonstrates robust practicality, maintaining 98% efficiency in real hospital wastewater, stable operation in a 12-h continuous-flow reactor, and a low operational cost of 0.28 USD/m(3). The technology's environmental sustainability is further validated by a remarkable 80% recovery of zebrafish embryo hatchability and a 93% reduction in developmental toxicity. This work provides a green and economically viable strategy for the destructive treatment of persistent halogenated contaminants in water.