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Insights into the Kinetics, Theoretical Model and Mechanism of Free Radical Synergistic Degradation of Micropollutants in UV/Peroxydisulfate Process
Liu, Zhixiong; Qin, Wenlei; Sun, Lei; Dong, Huiyu; Yuan, Xiangjuan; Pan, Fei; Xia, Dongsheng
2022-09-01
Source PublicationWATER
Volume14Issue:18Pages:2811
AbstractThe degradation of acyclovir (ACY) and atenolol (ATL) in the UV/peroxydisulfate (UV/PDS) process has been systematically considered, focusing on the degradation kinetics, theoretical models, and reaction pathways via applying a microfluidic UV reaction system. The removal efficiencies of ACY and ATL were >94.8%, and the apparent degradation rate constants (k(obs)) were 0.0931 and 0.1938 min(-1) at pH 6.0 in the UV/PDS system. The sulfate radical (SO4 center dot-) and hydroxyl radical ((OH)-O-center dot) were identified as the major reactive radicals. The pH-dependent reaction rate constants of ACY and ATL with (OH)-O-center dot and SO4 center dot- were measured via the competing kinetics. Meanwhile, the contributions of (OH)-O-center dot and SO4 center dot- for ACY and ATL degradation were calculated by the radical steady-state hypothesis, and the results revealed that SO4 center dot- occupied a decisive position (>84.5%) for the elimination of ACY and ATL. The contribution of (OH)-O-center dot became more significant with the increasing pH, while SO4 center dot- was still dominant. Moreover, ACY and ATL degradation performance were systematically evaluated via the experiments and Kintecus model under different operational parameters (Cl-, Br-, HCO3-, NOM, etc.) in the UV/PDS process. Furthermore, the plausible reaction pathways of ACY and ATL were elucidated based on the Fukui function theory and ultra-performance liquid chromatography-tandem quadrupole time-of-flight mass spectrometry (UPLC-QTOF-MS) analysis. The UV/PDS process has been demonstrated to be an efficient and potential application for micropollutants mitigation.
Department环境水质学国家重点实验室 ; 环境水质学国家重点实验室
KeywordACTIVATED PERSULFATE KINETICS ADVANCED OXIDATION PROCESSES BROMIDE-CONTAINING WATERS AQUEOUS-SOLUTION WASTE-WATER HYDROXYL RADICALS BROMATE FORMATION ORGANIC-COMPOUNDS FLASH-PHOTOLYSIS CENTER-DOT
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/47707
Collection环境水质学国家重点实验室
Affiliation1.Wuhan Text Univ, Sch Environm Engn, Wuhan 430073, Peoples R China
2.Univ Chinese Acad Sci, Res Ctr Ecoenvironm Sci, 18 Shuang Qing Rd, Beijing 100085, Peoples R China
3.Minist Educ, Engn Res Ctr Clean Prod Text Dyeing & Printing, Wuhan 430073, Peoples R China
Recommended Citation
GB/T 7714
Liu, Zhixiong,Qin, Wenlei,Sun, Lei,et al. Insights into the Kinetics, Theoretical Model and Mechanism of Free Radical Synergistic Degradation of Micropollutants in UV/Peroxydisulfate Process[J]. WATER,2022,14(18):2811.
APA Liu, Zhixiong.,Qin, Wenlei.,Sun, Lei.,Dong, Huiyu.,Yuan, Xiangjuan.,...&Xia, Dongsheng.(2022).Insights into the Kinetics, Theoretical Model and Mechanism of Free Radical Synergistic Degradation of Micropollutants in UV/Peroxydisulfate Process.WATER,14(18),2811.
MLA Liu, Zhixiong,et al."Insights into the Kinetics, Theoretical Model and Mechanism of Free Radical Synergistic Degradation of Micropollutants in UV/Peroxydisulfate Process".WATER 14.18(2022):2811.
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