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Degradation of iodinated disinfection byproducts by VUV/UV process based on a mini-fluidic VUV/UV photoreaction system
Hu, Jun; Wang, Chen; Ye, Zhen; Dong, Huiyu; Li, Mengkai; Chen, Jianmeng; Qiang, Zhimin
2019-07-01
Source PublicationWATER RESEARCH
ISSN0043-1354
Volume158Pages:417-423
AbstractThis study investigated the VUV/UV photodegradation of three iodinated disinfection byproducts (I-DBPs), namely, triiodomethane (TIM), diiodoacetamide (DIAcAm) and triiodoacetic acid (TIAA), based on a mini-fluidic VUV/UV photoreaction system (MVPS). The pseudo-first-order rate constants (k) of TIM, DIAcAm and TIAA under VUV/UV irradiation (1769, 1301 and 1174 m(2) einstein(-1), respectively) were higher than those under UV irradiation (1003, 832 and 766 m(2) einstein(-1), respectively). The enhancement of photodegradation could be attributed to the indirect HO center dot oxidation rather than the direct VUV photolysis. As a whole, compared with the indirect HO center dot oxidation, the direct UV photolysis had a relatively greater contribution to the degradation of the three I-DBPs, especially DIAcAm and TIAA (ca. 57% and 60%, respectively). The two electron-withdrawing groups in DIAcAm and TIM (i.e., acylamino and carboxyl) decreased the electron density of the C-I bonds, thus weakening the electrophilic attack of HO center dot. The iodine in the three I-DBPs was released to form I- and a small fraction (< 6%) of I- was oxidized to IO3-, indicating that HO center dot preferred to break the C-I bonds rather than oxidize I-. The direct UV photolysis proceeded via H2O-catalyzed deiodination reactions, while the indirect HO center dot oxidation proceeded via deiodination reactions along with HO center dot addition. The VUV/UV photodegradation of the three I-DBPs was more favored at an acidic pH but inhibited by the water matrix components (i.e., NOM, Cl- and alkalinity) to different extents. (C) 2019 Elsevier Ltd. All rights reserved.
Department中国科学院饮用水科学与技术重点实验室
KeywordVacuum ultraviolet (VUV) Iodinated disinfection byproducts (I-DBPs) Mini-fluidic VUV/UV photoreaction system (MVPS) Drinking water
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43436
Collection中国科学院饮用水科学与技术重点实验室
Affiliation1.Zhejiang Univ Technol, Coll Environm, 18 Chao Wang Rd, Hangzhou 310014, Zhejiang, Peoples R China
2.Univ Chinese Acad Sci, Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, 18 Shuang Qing Rd, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Hu, Jun,Wang, Chen,Ye, Zhen,et al. Degradation of iodinated disinfection byproducts by VUV/UV process based on a mini-fluidic VUV/UV photoreaction system[J]. WATER RESEARCH,2019,158:417-423.
APA Hu, Jun.,Wang, Chen.,Ye, Zhen.,Dong, Huiyu.,Li, Mengkai.,...&Qiang, Zhimin.(2019).Degradation of iodinated disinfection byproducts by VUV/UV process based on a mini-fluidic VUV/UV photoreaction system.WATER RESEARCH,158,417-423.
MLA Hu, Jun,et al."Degradation of iodinated disinfection byproducts by VUV/UV process based on a mini-fluidic VUV/UV photoreaction system".WATER RESEARCH 158(2019):417-423.
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