Degradation of chloramphenicol by UV/chlorine treatment: Kinetics, mechanism and enhanced formation of halonitromethanes

Water Research
Huiyu DongJiuhui Qu

Abstract

Ultraviolet (UV)/chlorine process is considered as an emerging advanced oxidation process for the degradation of micropollutants. This study investigated the degradation of chloramphenicol (CAP) and formation of disinfection by-products (DBPs) during the UV/chlorine treatment. It was found that CAP degradation was enhanced by combined UV/chlorine treatment compared to that of UV and chlorination treatment alone. The pseudo-first-order rate constant of the UV/chlorine process at pH 7.0 reached 0.016 s(-1), which was 10.0 and 2.0 folds that observed from UV and chlorination alone, respectively. The enhancement can be attributed to the formation of diverse radicals (HO and reactive chlorine species (RCSs)), and the contribution of RCSs maintained more stable than that of HO at pH 5.5-8.5. Meanwhile, enhanced DBPs formation during the UV/chlorine treatment was observed. Both the simultaneous formation and 24-h halonitromethanes formation potential (HNMsFP) were positively correlated with the UV/chlorine treatment time. Although the simultaneous trichloronitromethane (TCNM) formation decreased with the prolonged UV irradiation, TCNM dominated the formation of HNMs after 24 h (>97.0%). According to structural analysis of transformati...Continue Reading

Citations

Feb 13, 2019·Environmental Science and Pollution Research International·Yongze LiuLiqiu Zhang
Jan 11, 2021·Journal of Hazardous Materials·Leilei XiaoFanghua Liu
Aug 14, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Ardhendu Sekhar GiriSankar Chakma
Oct 24, 2018·Molecular Pharmaceutics·Sofia ValentiRoberto Macovez
Aug 21, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Olesia ShmychkovaAlexander Velichenko

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