Studies on reaction mechanisms and distinct chemiluminescence from cyanoimino neonicotinoids triggered by peroxymonosulfate in advanced oxidation processes  

作　　者：Mengdie Cai Weimin Gan Zhiqin Ding Hongping Cai Lijun Wei Xianglei Cheng 

机构地区：[1]Jiangxi Province Key Laboratory of Preventive Medicine,School of Public Health,Nanchang University,Nanchang 330006,China

出　　处：《Chinese Chemical Letters》2023年第3期206-208,共3页中国化学快报（英文版）

基　　金：financial supports from the National Natural Science Foundation of China(Nos.81960600and 81760601);the Natural Science Foundation of Jiangxi Province(Nos.20192BAB205089 and 20192BAB205091)。

摘　　要：In this study, we proposed a novel method to investigate the advanced oxidation process of neonicotinoids(NNIs) from the perspective of concomitant chemiluminescence(CL) reaction. It was found that in the presence of cobalt ions with cyanoimino NNIs, acetamiprid(ACE) and thiacloprid(THI), could promote peroxymonosulfate and Ru(bpy)_(3)^(2+) to produce strong CL, but no CL occurred with nitro-involved NNIs as alternatives. Experimental dada from UV absorption spectra and chemiluminescence spectra suggested that new cyclic compounds might be formed during the reaction. Based on the results of free radical scavenging experiment and mass spectra, a new degradation and reaction mechanism of cyanoiminocontaining NNIs was proposed. ACE or THI were first attacked by SO_(4)^(·-) to form benzyl radicals, which in turn reacted with the carbon atoms of cyano group through electrophilic addition reaction in the formation of intramolecular ring. Then a redox reaction between Ru(bpy)_(3)^(3+) and imino group immediately took place with CL emission(610 nm). The new mechanistic knowledge would be meaningful for other contaminants for their interactions with PMS.

关 键 词：Advanced oxidation processes Chemiluminescence mechanisms Annulation reaction PEROXYMONOSULFATE ACETAMIPRID THIACLOPRID 

分 类 号：X703[环境科学与工程—环境工程]