4.7 Article

Significant role of high-valent iron-oxo species in the degradation and detoxification of indomethacine

Journal

CHEMOSPHERE
Volume 251, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.126451

Keywords

Iron-oxo; Indomethacine; Degradation mechanism; Detoxification

Funding

  1. National Natural Science Foundation of China [51978238]
  2. Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07201002]
  3. Six Talent Peaks Project in Jiangsu Province [JNHB-004]
  4. Priority Academic Program Development of Jiangsu Higher Education Institutions

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A novel high-valent iron-oxo species (Fe(IV) = O) generated from Iron hexadecachlorophthalocyanine (FePcCl16)-mediated peroxymonosulfate (PMS) activation under visible light illumination for the degradation of a special group of compounds, indomethacine (IDM), containing methoxy, carboxyl, chloro, and amide groups was investigated. The experimental results indicate that Fe(IV) = O was able to selectively attack the carbonyl C-N bond on twisted amide groups, which exerts a strong toxic effect, and could therefore, effectively degrade and detoxify IDM and its byproducts. Twelve byproducts were identified by HPLC/MS/MS and calculation of frontier electron densities (FEDs), with all amide-group breakage products detected, and the possible pathways were deduced, which mainly consisted of Fe(IV) = O-induced cleavage of amide groups and radicals-induced reactions. Ecological risk assessment further confirmed a decrease in toxicity towards IDM degradation, which provides a promising Fe(IV) = O species for selective oxidation and detoxification of destabilized ground-state amides in drinking-water and wastewater treatment. (C) 2020 Elsevier Ltd. All rights reserved.

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