Mn-MOF derived manganese sulfide as peroxymonosulfate activator for levofloxacin degradation: An electron-transfer dominated and radical/nonradical coupling process  

作　　者：Xiaolin Han Wei Zhang Shuai Li Congyu Cheng Qi Yu Qilong Jia Lei Zhou Guangli Xiu 

机构地区：[1]State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process,School of Resources and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China [2]Shanghai Environmental Protection Key Laboratory on Environmental Standard and Risk Management of Chemical Pollutants,East China University of Science and Technology,Shanghai 200237,China [3]Shanghai Institute of Pollution Control and Ecological Security,Tongji University,Shanghai 200092,China

出　　处：《Journal of Environmental Sciences》2023年第8期197-211,共15页环境科学学报（英文版）

基　　金：supported by the Natural Science Foundation of Shanghai(No.17ZR1407000);the National Natural Science Foundation of China(No.41201302);the Fundamental Research Funds for the Central Universities(No.222201514337).

摘　　要：Recently,transitionmetal sulfides have attractedmuch attention due to their better catalytic capacities as peroxymonosulfate(PMS)activator than their metal oxide counterparts.However,the systematic studies on PMS activation using transition metal sulfides are still lacking.In this work,manganese sulfide(MnS)materials were synthesized via a MOFs-derived method and utilized for PMS activation to degrade levofloxacin(LVF)in water for the first time.As expected,MnS exhibited remarkable LVF degradation efficiency by PMS activation,whichwas distinctly higher than Mn_(2)O_(3).The results of quenching experiments,electro spin resonance identification and electrochemical tests indicated that electron-transfer progress was the dominant mechanism inα-MnS/PMS system.Meanwhile,the presence of ^(1)O_(2) and radicals further became the removal of LVF byα-MnS/PMS system into a radical/nonradical coupling process.The superior electrical conductivity ofα-MnS thanα-Mn_(2)O_(3) was revealed by DFT calculations,which resulted in the higher catalytic capacity ofα-MnS.The result of XPS also indicated the S species in MnS accelerated the recycle of Mn(IV)/Mn(II)and then promoted the generation of radicals.Furthermore,the influence of various environmental conditions on LVF removal and the reusability ofα-MnS were also investigated,which demonstrated the high application potential ofα-MnS/PMS system.Finally,six possible pathways of LVF oxidation in the system were proposed based on the identified byproducts and their ecotoxicity was evaluated with ECOSAR method.This work promotes the fundamental understanding of PMS activation byα-MnS and provides useful information for practical application of manganese sulfide in water treatment.

关 键 词：MNS Metal organic frameworks PMS LEVOFLOXACIN Electron-transfer pathway 

分 类 号：X703[环境科学与工程—环境工程]