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

• Published in: 中国化学快报（英文版） Vol. 34; no. 3; pp. 206 - 208
• Main Authors: Mengdie Cai, Weimin Gan, Zhiqin Ding, Hongping Cai, Lijun Wei, Xianglei Cheng
• Format: Journal Article
• Language: English
• Published: Jiangxi Province Key Laboratory of Preventive Medicine,School of Public Health,Nanchang University,Nanchang 330006,China 2023
• Subjects: Advanced oxidation processes; Acetamiprid; Peroxymonosulfate; Annulation reaction; Chemiluminescence mechanisms; Thiacloprid
• ISSN: 1001-8417; 1878-5964

In this study,we proposed a novel method to investigate the advanced oxidation process of neonicoti-noids(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)32+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 cyanoimino-containing NNIs was proposed.ACE or THI were first attacked by SO4·-to form benzyl radicals,which in turn reacted with the carbon atoms of cyano group through electrophilic addition reaction in the for-mation of intramolecular ring.Then a redox reaction between Ru(bpy)33+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.