Catalytic Oxidation of Imidacloprid Insecticide by Cu(II)/Peroxymonosulfate System

Autor(es)

Nunez-de la Rosa, Yeison ; Ballesteros-Ballesteros, Vladimir A. ; Durango, Luis Guillermo Cuadrado ; Toledo, Jorge Luis Nisperuza ; Fernandes, Maria Fatima das Gracas ; Aquino, Jose M.

• Tipo de documento: Artigo Científico
• Fonte: WATER AIR AND SOIL POLLUTION; v. 236, n. 5, p. 13-pg., 2025-05-01.

Resumo

Water contamination by synthetic organic compounds is one of the major environmental issues facing the world today. Among the available methods to treat them, catalytic advanced oxidation processes using Cu(II) ions to activate peroxymonosulfate is a potential candidate at slightly alkaline conditions (pH 8). In this work, we investigated the influence of PMS concentration (0-1000 mu mol L-1), solution pH (7-10), and the effect of water matrix (ultrapure, tap, and simulated municipal wastewater-SMWW) on imidacloprid (IMD) insecticide oxidation. After optimization of the investigated variables (500 mu mol L-1 PMS and pH 8), almost complete IMD oxidation was achieved in 6 h using ultrapure and tap water. The main detected byproducts resulting from IMD oxidation in ultrapure water are due to hydroxylation reactions and rupture of the imidazolidine ring. When SMWW was used, IMD oxidation was only 10% in 6 h, probably due to the scavenging effect of inorganic and organic compounds. The main produced working oxidants were radical (mainly HO center dot and SO4 center dot-) and non-radical (1O2, Cu(I), and Cu(III)) species, based on scavenging experiments and mass spectrometry detection of produced DMPO byproducts. Among these, HO center dot species seems to promptly oxidize IMD. (AU)

• Processo FAPESP: 14/50918-7 - INCT 2014: para o Controle Biorracional de Insetos Pragas e Fitopatógenos
• Beneficiário: Maria Fátima das Graças Fernandes da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/07943-4 - Estudo comparativo de sistemas homogêneos e heterogêneos com partículas nano/micrométricas para a degradação de poluentes orgânicos via homólise in situ de oxidantes
• Beneficiário: José Mario de Aquino
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 21/13604-8 - Desvendando o mecanismo de atuação das ferritas magnéticas: contribuição de processos homogêneos e heterogêneos para a degradação de poluentes orgânicos via ativação in situ de oxidantes
• Beneficiário: José Mario de Aquino
• Modalidade de apoio: Auxílio à Pesquisa - Regular