Ag/AgCl/ZnO/ATP光催化降解水体中吡虫啉

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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SO₄^2-和NO₃^-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⁺、×O₂ ^-、×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.

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	王阳阳
	杨嘉伟
	孙磊
	王嘉宁
	叶静怡
	包家华
	杨柳

关键词 ： Ag/AgCl, ZnO, ATP, 异质结, 光催化, 吡虫啉

Abstract：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 SO₄^2- and NO₃^- 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⁺, ·O₂^-, and ·OH), and ultimately realizes the efficient degradation of IMI.

Key words： Ag/AgCl ZnO ATP heterojunction photocatalysis imidacloprid

收稿日期: 2024-03-09

PACS:

X52

通讯作者: 杨柳,副教授,yangliu1104@mail.lzjtu.cn E-mail: yangliu1104@mail.lzjtu.cn

作者简介: 王阳阳(1999-),男,河南周口人,兰州交通大学硕士研究生,主要从事水污染处理研究.17638920472@163.com.

引用本文:

王阳阳, 杨嘉伟, 孙磊, 王嘉宁, 叶静怡, 包家华, 杨柳. Ag/AgCl/ZnO/ATP光催化降解水体中吡虫啉[J]. 中国环境科学, 2024, 44(10): 5566-5575. WANG Yang-yang, YANG Jia-wei, SUN Lei, WANG Jia-ning, YE Jing-yi, BAO Jia-hua, YANG Liu. Photocatalytic degradation of imidacloprid in water by Ag/AgCl/ZnO/ATP. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(10): 5566-5575.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I10/5566

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