Accelerated Degradation of Aqueous Recalcitrant Iodinated Contrasting Media Using a UV/SO 3 2- Advanced Reduction Process

Based on the formation of free radical-hydrated electrons by the activation of sulfite (SO ), the UV/SO process is an advanced reduction process that can reduce pollutants. This study investigated the degradation kinetics, mechanism, influencing factors, and degradation pathways of sodium diatrizoat...

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Bibliographic Details
Published inHuanjing kexue Vol. 42; no. 3; p. 1443
Main Authors Liu, Zi-Qi, Qiu, Fu-Guo, Lai, Man-Ting, Li, Jin, Dong, Hui-Yu, Qiang, Zhi-Min
Format Journal Article
LanguageChinese
Published China 08.03.2021
Subjects
diatrizoate(DTZ)
advanced reduction processes(ARPs)
free radical
UV/sulfite system
iodinated contrast media(ICM)
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Summary:Based on the formation of free radical-hydrated electrons by the activation of sulfite (SO ), the UV/SO process is an advanced reduction process that can reduce pollutants. This study investigated the degradation kinetics, mechanism, influencing factors, and degradation pathways of sodium diatrizoate (DTZ), an iodinated contrasting media, during the UV/SO process. The degradation kinetics of DTZ were well fitted by the pseudo-first-order model, the degradation rate of which was higher than that of UV only and UV/H O . The degradation rate of DTZ during the UV/SO process was positively correlated with the initial SO concentration. Weakly alkaline and alkaline conditions promoted the degradation of DTZ, while organic matter inhibited degradation during the UV/SO process. The degradation mechanism included direct photolysis and free radical attack, whereby free radical attack played a more important role than direct photolysis. Sulfite radicals dominated DTZ degradation efficiency, and hydrated electrons control
ISSN:0250-3301