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A Mechanistic Study of Goethite-Based Fenton-Like Reactions for Imidacloprid Degradation.

Bo YeHongbiao CuiNing ChenGuodong FangJuan GaoYujun Wang
Published in: Bulletin of environmental contamination and toxicology (2023)
Biotic transformation of imidacloprid (IMD) has been widely investigated in the environments. However, little was known about IMD degradation via abiotic pathways, such as reactive oxygen species (ROS)-based oxidation processes. Here we systematically investigated the mechanism of hydroxyl radical ( • OH) production and the associated IMD degradation in the goethite (α-FeOOH)-based Fenton-like systems. Results showed that IMD can be efficiently degraded in the α-FeOOH/H 2 O 2 systems, with degradation rate exceeded 80% within 48 h. Based on the examination of electron paramagnetic resonance (EPR) and chemical probes, • OH was identified as the key ROS that responsible for IMD degradation. IMD can be decomposed via hydroxylation or removal of -N-NO 2 to produce hydroxylated IMD, cyclic urea and 6-chloronicotinic acid, with the associated toxicities also evaluated. In addition, the increasing H 2 O 2 concentration and decreasing solution pH both significantly increased IMD degradation. This study provides theoretical understanding for the implications of soil mineral-based Fenton-like reactions in the abiotic transformation of pesticide pollutants.
Keyphrases
  • reactive oxygen species
  • hydrogen peroxide
  • wastewater treatment
  • dna damage
  • risk assessment
  • small molecule
  • nitric oxide
  • heavy metals
  • oxidative stress
  • photodynamic therapy
  • fluorescence imaging
  • living cells