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Article

Insights into the Kinetics, Theoretical Model and Mechanism of Free Radical Synergistic Degradation of Micropollutants in UV/Peroxydisulfate Process

1
School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China
2
Research Center for Eco-Environmental Sciences, University of Chinese Academy of Sciences, 18 Shuang-qing Road, Beijing 100085, China
3
Engineering Research Center for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430073, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Dionysios (Dion) Demetriou Dionysiou, Yujue Wang and Huijiao Wang
Water 2022, 14(18), 2811; https://doi.org/10.3390/w14182811
Received: 18 August 2022 / Revised: 5 September 2022 / Accepted: 6 September 2022 / Published: 9 September 2022
(This article belongs to the Special Issue Advanced Oxidation Processes for Emerging Contaminant Removal)
The 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 (kobs) were 0.0931 and 0.1938 min−1 at pH 6.0 in the UV/PDS system. The sulfate radical (SO4•−) and hydroxyl radical (OH) were identified as the major reactive radicals. The pH-dependent reaction rate constants of ACY and ATL with OH and SO4•− were measured via the competing kinetics. Meanwhile, the contributions of OH and SO4•− for ACY and ATL degradation were calculated by the radical steady-state hypothesis, and the results revealed that SO4•− occupied a decisive position (>84.5%) for the elimination of ACY and ATL. The contribution of OH became more significant with the increasing pH, while SO4•− 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. View Full-Text
Keywords: UV/PDS; micropollutants; radical contribution rates; kinetic models; degradation pathways UV/PDS; micropollutants; radical contribution rates; kinetic models; degradation pathways
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MDPI and ACS Style

Liu, Z.; Qin, W.; Sun, L.; Dong, H.; Yuan, X.; Pan, F.; Xia, D. Insights into the Kinetics, Theoretical Model and Mechanism of Free Radical Synergistic Degradation of Micropollutants in UV/Peroxydisulfate Process. Water 2022, 14, 2811. https://doi.org/10.3390/w14182811

AMA Style

Liu Z, Qin W, Sun L, Dong H, Yuan X, Pan F, Xia D. Insights into the Kinetics, Theoretical Model and Mechanism of Free Radical Synergistic Degradation of Micropollutants in UV/Peroxydisulfate Process. Water. 2022; 14(18):2811. https://doi.org/10.3390/w14182811

Chicago/Turabian Style

Liu, Zhixiong, Wenlei Qin, Lei Sun, Huiyu Dong, Xiangjuan Yuan, Fei Pan, and Dongsheng Xia. 2022. "Insights into the Kinetics, Theoretical Model and Mechanism of Free Radical Synergistic Degradation of Micropollutants in UV/Peroxydisulfate Process" Water 14, no. 18: 2811. https://doi.org/10.3390/w14182811

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