Insights into CoFe 2 O 4 /Peracetic Acid Catalytic Oxidation Process for Iopamidol Degradation: Performance, Mechanisms, and I-DBP Formation Control.
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| Title: | Insights into CoFe 2 O 4 /Peracetic Acid Catalytic Oxidation Process for Iopamidol Degradation: Performance, Mechanisms, and I-DBP Formation Control. |
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| Authors: | Wu, Haiwei1 (AUTHOR), Zhang, Jiaming2 (AUTHOR), Zhao, Fangbo1,3 (AUTHOR), Fan, Wei2,4 (AUTHOR), Yang, Song1,3 (AUTHOR), Ma, Jun2,4 (AUTHOR) |
| Source: | Nanomaterials (2079-4991). Jun2025, Vol. 15 Issue 12, p897. 16p. |
| Subjects: | Radiographic contrast media, Disinfection by-product, Peracetic acid, Catalytic oxidation, Charge exchange, Water chlorination |
| Abstract: | In chlorination disinfection treatment, residual iodinated X-ray contrast media (ICMs) are the precursors to iodinated disinfection by-products (I-DBPs). This study employed CoFe2O4 nanoparticle catalytic peracetic acid oxidation (CoFe2O4/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)CCH3), 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− (UV/chlorine), a portion of I− generated through IPM dehalogenation underwent conversion to reactive iodine species (RIS), consequently elevating the MIAAFP. In CoFe2O4/PAA, the MIAAFP was less than 43% of that in UV/chlorine, which can be attributed to the complete conversion of I− into iodate IO3− without generating RIS. CoFe2O4/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. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | In chlorination disinfection treatment, residual iodinated X-ray contrast media (ICMs) are the precursors to iodinated disinfection by-products (I-DBPs). This study employed CoFe2O4 nanoparticle catalytic peracetic acid oxidation (CoFe2O4/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)CCH3), 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− (UV/chlorine), a portion of I− generated through IPM dehalogenation underwent conversion to reactive iodine species (RIS), consequently elevating the MIAAFP. In CoFe2O4/PAA, the MIAAFP was less than 43% of that in UV/chlorine, which can be attributed to the complete conversion of I− into iodate IO3− without generating RIS. CoFe2O4/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. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 20794991 |
| DOI: | 10.3390/nano15120897 |
