Insights into the electron transfer mechanisms of permanganate activation by carbon nanotube membrane for enhanced micropollutants degradation  

作　　者：Xufang Wang Dongli Guo Jinna Zhang Yuan Yao Yanbiao Liu 

机构地区：[1]College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China [2]State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin 150090,China [3]MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150080,China [4]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China

出　　处：《Frontiers of Environmental Science & Engineering》2023年第9期115-124,共10页环境科学与工程前沿(英文)

基　　金：supported by the Natural Science Foundation of Shanghai(No.23ZR1401300);the National Natural Science Foundation of China(No.52170068).

摘　　要：Numerous reagents have been proposed as electron sacrificers to induce the decomposition of permanganate(KMnO_(4))by producing highly reactive Mn species for micropollutants degradation.However,this strategy can lead to low KMnO_(4) utilization efficiency due to limitations associated with poor mass transport and high energy consumption.In the present study,we rationally designed a catalytic carbon nanotube(CNT)membrane for KMnO_(4) activation toward enhanced degradation of micropollutants.The proposed flow-through system outperformed conventional batch reactor owing to the improved mass transfer via convection.Under optimal conditionals,a>70%removal(equivalent to an oxidation flux of 2.43 mmol/(h·m^(2)))of 80μmol/L sulfamethoxazole(SMX)solution can be achieved at single-pass mode.The experimental analysis and DFT studies verified that CNT could mediate direct electron transfer from organic molecules to KMnO_(4),resulting in a high utilization efficiency of KMnO_(4).Furthermore,the KMnO_(4)/CNT system had outstanding reusability and CNT could maintain a long-lasting reactivity,which served as a green strategy for the remediation of micropollutants in a sustainable manner.This study provides new insights into the electron transfer mechanisms and unveils the advantages of effective KMnO_(4) utilization in the KMnO_(4)/CNT system for environmental remediation.

关 键 词：KMnO_(4) Carbon nanotubes Non-radical pathway Electron transfer Water treatment 

分 类 号：TB383.1[一般工业技术—材料科学与工程]