【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 (Bi2O3)using a facile chemical precipitation process to improve its catalytic activity
【机 构】
：
Key Laboratory of Groundwater Resources and Environment,Ministry of Education,Jilin University,Chang
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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 (Bi2O3)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％ Bi2O3 loading.The degradation rate in the CoOOH@Bi2O3/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@Bi2O3 displayed better stability with less Co ions leaching (16.4％lower than CoOOH) in the PMS system.These phenomena were attributed to the Bi2O3 loading which significantly increased the conductivity and specific surface area of the CoOOH@Bi2O3 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 (1O2) and radicals(SO4-·,O2-·,and OH·) in the CoOOH@Bi2O3/PMS system and 1O2 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.
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