Ag/AgCl/ZnO/ATP光催化降解水体中吡虫啉  

Photocatalytic degradation of imidacloprid in water by Ag/AgCl/ZnO/ATP

作　　者：王阳阳 杨嘉伟 孙磊 王嘉宁 叶静怡 包家华 杨柳[1] WANG Yang-yang;YANG Jia-wei;SUN Lei;WANG Jia-ning;YE Jing-yi;BAO Jia-hua;YANG Liu(Key Laboratory of Yellow River Water Environment of Gansu Province,College of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃省黄河水环境重点实验室,甘肃兰州730070

出　　处：《中国环境科学》2024年第10期5566-5575,共10页China Environmental Science

摘　　要：利用水热法和沉淀-光还原法成功制备具有高效光催化活性的Ag/AgCl/ZnO/ATP异质结复合光催化剂,探究其对水体中吡虫啉(IMI)的光降解性能及机理.结果表明:在可见光照射下,Ag/AgCl/ZnO/ATP光催化剂表现出优异光催化性能,30min内可以完全去除IMI.降解过程符合准一级动力学模型,其反应速率常数是AgCl的7.2倍;在pH 5~11范围内对IMI具有优异的光降解效果;水体中SO_(4)^(2-)和NO_(3)^(-)对光催化剂降解IMI均有一定促进作用;经过5次循环重复使用后仍能保持高效的光催化性能和稳定性;结合表征和实验验证可知,AgCl/ZnO异质结的构成,有效地抑制了电子-空穴对的复合,使得IMI在活性物质(h^(+)、⋅O_(2)^(-)、⋅OH)作用下发生硝基去除、脱氯以及吡啶和咪唑的开环,最终实现对IMI的高效降解.Ag/AgCl/ZnO/ATP heterojunction composite photocatalysts were successfully prepared by hydrothermal and precipitation-photoreduction methods.Due to its high efficient photocatalytic activity,the Ag/AgCl/ZnO/ATP was investigated the photodegradation performance and mechanism of imidacloprid(IMI)in water.And it exhibited excellent photocatalytic performance under visible light irradiation,and the removal ability for IMI within 30min.The degradation process conformed to the quasi-primary kinetic model,and its reaction rate constant was 7.2 times higher than that of AgCl.The photodegradation of the IMI well executed within the pH range of 5~11.Both SO_(4)^(2-) and NO_(3)^(-) have a certain promotion effect on the degradation of IMI in the water,and the efficient photocatalytic performance and stability can still be maintained after 5 cycles of reuse.Combined with the characterization and experimental validation,it can be seen that the composition of the AgCl/ZnO heterojunction effectively inhibits the complexation of electron-hole pairs.Which allows IMI to undergo nitroxide removal,dechlorination,and ring-opening of pyridine and imidazole under the action of the active substances(h^(+),·O_(2)^(-),and·OH),and ultimately realizes the efficient degradation of IMI.

关 键 词：Ag/AgCl ZNO ATP 异质结 光催化 吡虫啉 

分 类 号：X52[环境科学与工程—环境工程]