Wu Haiwei, Zhang Jiaming, Zhao Fangbo, Fan Wei, Yang Song, Ma Jun
College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
School of Environment, Northeast Normal University, 2555 Jingyue Street, Changchun 130117, China.
Nanomaterials (Basel). 2025 Jun 10;15(12):897. doi: 10.3390/nano15120897.
In chlorination disinfection treatment, residual iodinated X-ray contrast media (ICMs) are the precursors to iodinated disinfection by-products (I-DBPs). This study employed CoFeO nanoparticle catalytic peracetic acid oxidation (CoFeO/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), 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 CoFeO/PAA, the MIAAFP was less than 43% of that in UV/chlorine, which can be attributed to the complete conversion of I into iodate IO without generating RIS. CoFeO/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.
在氯化消毒处理中，残留的碘化X射线造影剂（ICMs）是碘化消毒副产物（I-DBPs）的前体。本研究采用CoFeO纳米颗粒催化过氧乙酸氧化（CoFeO/PAA）来去除碘帕醇（IPM）并控制I-DBP的形成。实验结果表明，在40分钟内IPM的降解率超过90%。亚稳态中间体（≡Co(II)-OO(O)CCH）而非烷氧基自由基被确定为主要的氧化物种（ROS）。亚稳态中间体与IPM之间的电子转移途径为氧原子转移和单电子转移。研究了一碘乙酸生成潜力（MIAAFP）。在紫外线活化的ClO（UV/氯）中，通过IPM脱卤生成的一部分I转化为活性碘物种（RIS），从而提高了MIAAFP。在CoFeO/PAA中，MIAAFP小于UV/氯中的43%，这可归因于I完全转化为碘酸盐IO而不产生RIS。因此，CoFeO/PAA由于能有效降解ICMs同时避免产生RIS，是一种很有前景的去除ICMs和控制I-DBP形成的处理方法。
