Enhanced catalytic oxidation of 2,4-dichlorophenol via singlet oxygen dominated peroxymonosulfate activation on CoOOH@Bi_(2)O_(3)composite  

作　　者：Tianhao Xi Xiaodan Li Qihui Zhang Ning Liu Shu Niu Zhaojun Dong Cong Lyu 

机构地区：[1]Key Laboratory of Groundwater Resources and Environment,Ministry of Education,Jilin University,Changchun,130026,China [2]Jilin Provincial Key Laboratory of Water Resources and Environment,Jilin University,Changchun,130026,China [3]China Northeast Municipal Engineering Design and Research Institute Co.Ltd.,Changchun,130021,China

出　　处：《Frontiers of Environmental Science & Engineering》2021年第4期109-119,共11页环境科学与工程前沿（英文）

基　　金：The present work was funded by the Natural Science Foundation of Jilin Provincial Science&Technology Department(Grant No.20180101081JC,20200403034SF;the Science and Technology Project of the Education Department of Jilin Province(Grant No.JJKH20190125KJ).Besides,we would thank to the supervision of Professor Wei Feng from Jilin University for this work.

摘　　要：Cobalt oxyhydroxide(CoOOH)has been turned out to be a high-efficiency catalyst for peroxymonosulfate(PMS)activation.In this study,CoOOH was loaded on bismuth oxide(Bi_(2)O_(3))using a facile chemical precipitation process to improve its catalytic activity and stability.The result showed that the catalytic performance on the 2,4-dichlorophenol(2,4-DCP)degradation was significantly enhanced with only 11 wt%Bi_(2)O_(3)loading.The degradation rate in the CoOOH@Bi_(2)O_(3)/PMS system(0.2011 min−1)was nearly 6.0 times higher than that in the CoOOH/PMS system(0.0337 min−1).Furthermore,CoOOH@Bi_(2)O_(3)displayed better stability with less Co ions leaching(16.4%lower than CoOOH)in the PMS system.These phenomena were attributed to the Bi_(2)O_(3)loading which significantly increased the conductivity and specific surface area of the CoOOH@Bi_(2)O_(3)composite.Faster electron transfer facilitated the redox reaction of Co(III)/Co(II)and thus was more favorable for reactive oxygen species(ROS)generation.Meanwhile,larger specific surface area furnished more active sites for PMS activation.More importantly,there were both non-radical(^(1)O_(2))and radicals(SO_(4)^(−)•,O_(2)^(−)•,and OH•)in the CoOOH@Bi_(2)O_(3)/PMS system and^(1)O_(2)was the dominant one.In general,this study provided a simple and practical strategy to enhance the catalytic activity and stability of cobalt oxyhydroxide in the PMS system.

关 键 词：Cobalt oxyhydroxide Bismuth oxide PEROXYMONOSULFATE 2 4-DICHLOROPHENOL Singlet oxygen Electron transfer 

分 类 号：O643.3[理学—物理化学]