氮掺杂碳负载氧化钴纳米团簇活化过一硫酸盐  

Nitrogen-doped carbon supported cobalt oxide clusters for peroxymonosulfate activation

作　　者：李文璇 张佩琴 孙建富 刘丹 吴西林[1] 陈建荣[1] LI Wen-xuan;ZHANG Pei-qin;SUN Jian-fu;LIU Dan;WU Xi-lin;CHEN Jian-rong(College of Geography and Environmental Sciences,Zhejiang Normal University,Jinhua 321004,China;Jinhua Environmental Monitoring Center,Jinhua 321000,China;Zhejiang Huapu Environmental Science&Technology Co.,Ltd,Jinghua 321000,China)

机构地区：[1]浙江师范大学地理与环境科学学院,浙江金华321004 [2]浙江省金华市生态环境监测中心,浙江金华321000 [3]浙江华普环境科技有限公司,浙江金华321000

出　　处：《中国环境科学》2023年第5期2341-2346,共6页China Environmental Science

基　　金：浙江省重点研发计划(2021C03163)。

摘　　要：采用天然的墨鱼骨为模板合成了氮掺杂碳负载氧化钴纳米团簇(CoO-CN),用于活化过一硫酸盐(PMS)降解诺氟沙星(NOR).结果表明,CoO-CN可在宽的pH值范围(3.0~11.0)高效活化PMS降解NOR,降解率均超过95%.循环使用5次后,CoO-CN/PMS体系对NOR的降解率仍达到91.8%.这些结果证明了CoO-CN优异的催化性能和可重复使用性,有望应用于实际污水的处理.淬灭实验和电子顺磁共振(EPR)表明CoO-CN/PMS体系涉及自由基和非自由基两种路径,产生硫酸根自由基(SO_(4)•–)、羟基自由基(•OH)和单线态氧(1O2)三种活性氧物种参与NOR的氧化降解.与纯的CN相比,CoO-CN可提供额外的Co活性位点,从而极大提高催化活化PMS的性能.此外,CoO-CN简易的合成方法和低廉的成本,使其在有机污水处理领域具有广泛的应用前景.By using natural cuttlebone as the template,cobalt oxide cluster supported on nitrogen-doped carbon(CoO-CN)were synthesized and applied for degradation of norfloxacin(NOR)via peroxymonosulfate(PMS)activation.The results indicate that the NOR can be effectively degraded by CoO-CN via PMS activation over a wide pH range(pH 3.0~11.0)with the NOR removal percentages all greater than 95%.After five recycling tests,the NOR degradation percentages still retained by 91.8%in the CoO-CN/PMS system.These results demonstrated that the CoO-CN possessed excellent catalytic performance and reusability,which is promising for practical applications in wastewater treatment.Quenching experiments and electron paramagnetic resonance(EPR)manifested that the CoO-CN/PMS system involved in two pathways,that are the radical and non-radical pathways,and produced three kinds of reactive oxygen species(ROS),including sulfate radical(SO_(4)•–),hydroxyl radical(•OH)and singlet oxygen(1O2),for the oxidative degradation of NOR.As compared with pure CN,extra Co active sites can be provided by the CoO-CN,thereby significant enhancing the catalytic performance for PMS activation.In addition,the simple synthetic method and low-cost of CoO-CN endowed it with broad application prospect for organic wastewater treatment.

关 键 词：高级氧化 过一硫酸盐 碳材料 抗生素 污染物降解 

分 类 号：X703.5[环境科学与工程—环境工程]