Cu(Ⅱ)催化NaOCl氧化碘帕醇的效果和过程解析

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Abstract A Cu(II)--activated NaOCl system was established to oxidize iopamidol (IPM), one of the typical non-ionic iodine X-ray contrast agents. The effects of Cu(II) and NaOCl concentrations, halide ions on the IPM oxidation, and the formation of iodine disinfection by-products (Iodoform, CHI₃) were examined. In addition, the crystallographic and morphological changes of Cu(Ⅱ) after the reaction were analyzed to explore its recovery and recycling. Combined with the cyclic voltammetry curves and chronoamperometry, the formation of Cu(III) was confirmed, and the mechanism of Cu(II)-activated NaOCl for oxidizing IPM was speculated. The results showed that compared with that of Co(II), Fe(II), and Mn(II), Cu(II) significantly improved NaOCl decomposition and IPM degradation, with IPM removal reaching 77.51 % in 60min under the experimental condition of 25℃, initial pH=6.71, 500r/min, NaOCl and Cu(II) concentrations of 0.5 and 0.05mmol/L, respectively. HO·, reactive chlorine radicals, and Cu(III) all contributed to IPM degradation. Meanwhile, the contribution of Cu(III) increased with pH value. IPM removal increased with NaOCl concentration in the range of 0.1~2.5mmol/L. There was an optimum value for Cu(II) concentration between 0.005 and 0.5mmol/L. A total of 13 intermediates were detected through HPLC/MS/MS analysis, degradation of IPM mainly followed hydrolysis and oxidation of side-chain amide bonds, iodine substitution, and hydroxyl addition. Cl^-, Br^-, and I^- (1~5mmol/L) not only affected the IPM removal but also the formation of CHI₃, with the maximum CHI₃ formation of 48.28μg/L in the Cu(II)/NaOCl/Br^- system.

Key words： iopamidol copper ion/sodium hypochlorite Cu(III) iodoform

Received: 11 November 2023

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X703

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	WEI Hong
	TENG Rui-jie
	ZHENG Jia-xin
	GAO Mei-juan
	NIU Jin-fen
	CAI Qian

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WEI Hong,TENG Rui-jie,ZHENG Jia-xin等. The performance and process analysis of copper ion activated chlorine system in the removal of Iopamidol[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(6): 3167-3178.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I6/3167

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