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<p>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 μmol L<sup>–1</sup>), 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 μmol L<sup>–1</sup> 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<sup>●</sup> and SO<sub>4</sub><sup>●–</sup>) and non-radical (<sup>1</sup>O<sub>2</sub>, Cu(I), and Cu(III)) species, based on scavenging experiments and mass spectrometry detection of produced DMPO byproducts. Among these, HO<sup>●</sup> species seems to promptly oxidize IMD.</p>

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

  • 期刊论文

  • 发表日期：

    2025年4月5日

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  • Yeison Núñez-de la Rosa,
  • Vladimir A. Ballesteros-Ballesteros,
  • Luis Guillermo Cuadrado Durango,
  • Jorge Luis Nisperuza Toledo,
  • Maria Fátima das Graças Fernandes,
  • José M. Aquino

摘要

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 μmol 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 μmol 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● and SO4●–) 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● species seems to promptly oxidize IMD.