The degradation of iopamidol by UV/chlorine was investigated and compared to that by UV/H2O2. UV/chlorine could accelerated the degradation rate of iopamidol compared to that by UV and chlorine alone. The degradation rate of iopamidol by UV/chlorine increased with increasing chlorine dosage and was favored under neutral pH conditions. Iopamidol could not be effectively removed by UV/H2O2 compared to that by UV/chlorine due to different radical formation. Secondary radicals (Cl2●－ and ClO●) rather than primary radicals (HO● and Cl●) were demonstrated to be mainly responsible for the enhancement removal of iopamidol by UV/chlorine. The oxidation products of iopamidol resulting from UV/chlorine and UV/H2O2 process were identified, and differences existed in the two systems. IO3- (the desired sink of I-) was the major inorganic product in the UV/chlorine process whereas I- was the predominant inorganic product in the UV/H2O2 process. The formation of chlorine-containing product during the degradation of iopamidol by UV/chlorine was observed. H-abstraction, additions, de-iodination were shared during the degradation of iopamidol by UV/chlorine and UV/H2O2.

Investigation of the iopamidol degradation by UV/chlorine

253rd National Meeting (2017)

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