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Reactive Nitrogen Species Are Also Involved in the Transformation of Micropollutants by the UV/Monochloramine Process
Wu, Zihao; Chen, Chunyan; Zhu, Ben-Zhan; Huang, Chun-Hua; An, Taicheng3; Meng, Fangang; Fang, Jingyun
2019-10-01
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume53Issue:19Pages:11142-11152
AbstractThe UV/monochloramine (NH2Cl) process is an emerging advanced oxidation process (AOP) in water treatment via radicals produced from the UV photolysis of NH2Cl. This study investigated the degradation of micropollutants by the UV/NH2Cl AOP, with ibuprofen (IBP) and naproxen (NPX) selected as representative micropollutants. Hydroxyl radical (HO center dot) and chlorine atom (Cl-center dot) were identified in the process, and unexpectedly, we found that reactive nitrogen species (RNS) also played important roles in the transformation of micropollutants. The electron paramagnetic resonance (EPR) analysis proved the production of (NO)-N-center dot as well as HO center dot. The concentrations of HO center dot, Cl-center dot, and (NO)-N-center dot in UV/NH2Cl remained constant at pH 6.0-8.6, resulting in the slightly changed UV fluence-based pseudo-first-order rate constants (k') of IBP and NPX, which were about 1.65 X 10(-3) and 2.54 X 10(-3) cm(2)/mJ, respectively. For IBP, the relative contribution of RNS to k' was 27.8% at pH 7 and 50 ktM NH2Cl, which was higher than that of Cl-center dot (6.5%) but lower than that of HO center dot (58.7%). For NPX, the relative contribution of RNS to k' was 13.6%, which was lower than both Cl-center dot (23.2%) and HO center dot (46.9%). The concentrations of HO center dot, Cl-center dot, and (NO)-N-center dot increased with the increasing NH2Cl dosage. Water matrix components of natural organic matter (NOM) and bicarbonate can scavenge HO center dot, Cl-center dot, and RNS. The presence of 5 mg/L NOM decreased the k' of IBP and NPX by 66.9 and 57.6%, respectively, while 2 mM bicarbonate decreased the k' of IBP by 57.4% but increased the k' of NPX by 10.5% due to the contribution of CO3(center dot)(-) to NPX degradation. Products containing nitroso-, hydroxyl-, and chlorine-groups were detected during the degradation of IBP and NPX by UV/NH2Cl, indicating the role of nitrogen oxide radical ((NO)-N-center dot) as well as HO center dot and Cl-center dot. Trichloronitromethane formation was strongly enhanced in the UV/NH2Cl-treated samples, further indicating the important roles of RNS in this process. This study first demonstrates the involvement of RNS in the transformation of micropollutants in UV/NH2Cl.
Department环境化学与生态毒理学国家重点实验室
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/42580
Collection环境化学与生态毒理学国家重点实验室
Affiliation1.Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Environm Pollut Control &, Guangzhou 510275, Guangdong, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China
3.Chinese Acad Sci, Univ Chinese Acad Sci, Beijing 100085, Peoples R China
4.Guangdong Univ Technol, Guangdong Key Lab Environm Catalysis & Hlth Risk, Sch Environm Sci & Engn, Inst Environm Hlth & Pollut Control, Guangzhou 510006, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Wu, Zihao,Chen, Chunyan,Zhu, Ben-Zhan,et al. Reactive Nitrogen Species Are Also Involved in the Transformation of Micropollutants by the UV/Monochloramine Process[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2019,53(19):11142-11152.
APA Wu, Zihao.,Chen, Chunyan.,Zhu, Ben-Zhan.,Huang, Chun-Hua.,An, Taicheng.,...&Fang, Jingyun.(2019).Reactive Nitrogen Species Are Also Involved in the Transformation of Micropollutants by the UV/Monochloramine Process.ENVIRONMENTAL SCIENCE & TECHNOLOGY,53(19),11142-11152.
MLA Wu, Zihao,et al."Reactive Nitrogen Species Are Also Involved in the Transformation of Micropollutants by the UV/Monochloramine Process".ENVIRONMENTAL SCIENCE & TECHNOLOGY 53.19(2019):11142-11152.
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