摘要
采用高温气固相氮化法制备了具有可见光响应能力的氮(氧)化钽并将其引入可见光-类Fenton体系,考察了降解以阿特拉津(ATZ)为代表的POPs的性能,结果表明:ATZ的降解效果显著,反应20 min时降解率已接近50%,60 min时降解率超95%,反应180min后已检测不出ATZ,其光化学反应符合准一级反应动力学模型。重复降解实验表明,催化剂的稳定性良好。氮(氧)化钽可见光-类Fenton体系通过产生具有强氧化性·OH自由基降解ATZ,其首先攻击ATZ氨基侧链上的C-N键产生脱烷基作用,之后通过脱氯作用、脱氨基作用等降解去除阿特拉津。
Tantalum(oxy)nitride catalyst were synthesized through gas&solid nitriding method at high temperature.Tantalum(oxy)nitride catalyst were added into photo-Fenton-like system to enhance degradation of POPs wastewater containing atrazine(ATZ)under visible light irradiation.The results showed that ATZ could be effectively degraded in the experimental conditions,with up to 50%removal rate in 20 min and over 95%in 60min.ATZ was not detected after reaction time of 180 min.The photocatalytic reactions of ATZ fit well with the pseudo-first order kinetics.Repeated degradation experiments showed that the tantalum(oxy)nitride catalyst and degradation efficiency were stable.In the degradation process of ATZ,dealkylation was first carried out,and the attack by hydroxyl radicals(·OH)acted on the C-N bond on the amino side of ATZ.Afterwards,ATZ was oxidized and removed through dichlorination and deamination.
作者
邓一荣
赵璐
杜瑛珣
陆海建
候思颖
杨子鹏
DENG Yirong;ZHAO Lu;DU Yingxun;LU Haijian;HOU Siying;YANG Zipeng(Guangdong Key Laboratory of Contaminated Environmental Management and Remediation,Guangdong Provincial Academy of Environmental Science,Guangzhou 510045,China;Guangzhou Research Institute of Environmental Protection,Guangzhou 510620,China;State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2019年第11期91-97,129,共8页
Environmental Science & Technology
基金
国家重点研发计划课题(2018YFC1800205,2018YFC1800806)
有机地球化学国家重点实验室开放基金(SKLOG-201618)
广东省重大科技专项(2016B020240008).
作者简介
邓一荣(1985-),男,高级工程师,博士,研究方向为土壤修复,(电子信箱)ecoyrdeng@163.com;通讯作者:赵璐,(电子信箱)zhaolu0503@163.com。