Insights into CoFe<sub>2</sub>O<sub>4</sub>/Peracetic Acid Catalytic Oxidation Process for Iopamidol Degradation: Performance, Mechanisms, and I-DBP Formation Control

Insights into CoFe<sub>2</sub>O<sub>4</sub>/Peracetic Acid Catalytic Oxidation Process for Iopamidol Degradation: Performance, Mechanisms, and I-DBP Formation Control

In chlorination disinfection treatment, residual iodinated X-ray contrast media (ICMs) are the precursors to iodinated disinfection by-products (I-DBPs). This study employed CoFe<sub>2</sub>O<sub>4</sub> nanoparticle catalytic peracetic acid oxidation (CoFe<sub>2</su...

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Bibliographic Details
Main Authors: Haiwei Wu, Jiaming Zhang, Fangbo Zhao, Wei Fan, Song Yang, Jun Ma
Format: Article
Language:English
Published: MDPI AG 2025-06-01
Series:Nanomaterials
Subjects:
peracetic acid
CoFe<sub>2</sub>O<sub>4</sub>
iopamidol
metastable intermediate
monoiodoacetic acid formation potential
Online Access:https://www.mdpi.com/2079-4991/15/12/897
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Summary:In chlorination disinfection treatment, residual iodinated X-ray contrast media (ICMs) are the precursors to iodinated disinfection by-products (I-DBPs). This study employed CoFe<sub>2</sub>O<sub>4</sub> nanoparticle catalytic peracetic acid oxidation (CoFe<sub>2</sub>O<sub>4</sub>/PAA) to remove iopamidol (IPM) and control I-DBP formation. The experimental results demonstrated that over 90% of the IPM degradation was achieved in 40 min. The metastable intermediate (≡Co(II)-OO(O)CCH<sub>3</sub>), rather than the alkoxyl radicals, was identified as the dominant oxidation species (ROS). The electron transfer pathways between the metastable intermediate and IPM were oxygen-atom transfer and single-electron transfer. The monoiodoacetic acid formation potential (MIAAFP) was investigated. In ultraviolet-activated ClO<sup>−</sup> (UV/chlorine), a portion of I<sup>−</sup> generated through IPM dehalogenation underwent conversion to reactive iodine species (RIS), consequently elevating the MIAAFP. In CoFe<sub>2</sub>O<sub>4</sub>/PAA, the MIAAFP was less than 43% of that in UV/chlorine, which can be attributed to the complete conversion of I<sup>−</sup> into iodate IO<sub>3</sub><sup>−</sup> without generating RIS. CoFe<sub>2</sub>O<sub>4</sub>/PAA is thus a promising treatment for removing ICMs and controlling I-DBP formation due to the efficient degradation of ICMs while avoiding the generation of RIS.
ISSN:2079-4991

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