Chen, Z.Z.ChenFang, J.J.FangCHIHHAO FANShang, C.C.Shang2018-09-102018-09-102016http://www.scopus.com/inward/record.url?eid=2-s2.0-84960796023&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/396687N-Nitrosopyrrolidine (NPYR) is an emerging contaminant in drinking water and wastewater. The degradation kinetics and mechanisms of NPYR degradation by the O3/UV process were investigated and compared with those of UV direct photolysis and ozonation. A synergistic effect of ozone and UV was observed in the degradation of NPYR due to the accelerated production of OH· by ozone photolysis. This effect was more pronounced at higher ozone dosages. The second-order rate constants of NPYR reacting with OH· and ozone was determined to be 1.38 (± 0.05) × 109 M-1 s-1 and 0.31 (± 0.02) M-1 s-1, respectively. The quantum yield by direct UV photolysis was 0.3 (± 0.01). An empirical model using Rct (the ratio of the exposure of OH· to that of ozone) was established for NPYR degradation in treated drinking water and showed that the contributions of direct UV photolysis and OH· oxidation on NPYR degradation were both significant. As the reaction proceeded, the contribution by OH· became less important due to the exhausting of ozone. Nitrate was the major product in the O3/UV process by two possible pathways. One is through the cleavage of nitroso group to form NO· followed by hydrolysis, and the other is the oxidation of the intermediates of amines by ozonation. © 2015 Elsevier Ltd.Advanced oxidation process (AOP); Hydroxyl radicals; Nitrosamines; Ozone; Ultraviolet; Water treatment[SDGs]SDG6Amines; Degradation; Nitrosamines; Oxidation; Ozone; Ozonization; Photodegradation; Photolysis; Potable water; Rate constants; Reaction intermediates; Water treatment; Advanced oxidation process; Degradation kinetics; Emerging contaminant; Hydroxyl radicals; Oxidative degradation; Second-order rate constants; Ultraviolet; Water and wastewater; Ozone water treatment; amine; drinking water; n nitrosopyrrolidine; nitrate; ozone; n nitrosopyrrolidine; ozone; water pollutant; amino acid; degradation; hydroxyl radical; oxidation; ozone; photolysis; reaction kinetics; ultraviolet radiation; Article; degradation kinetics; hydrolysis; oxidation; ozonation; photolysis; quantum yield; radiation exposure; ultraviolet radiation; chemistry; kinetics; oxidation reduction reaction; ultraviolet radiation; water management; water pollutant; Kinetics; N-Nitrosopyrrolidine; Oxidation-Reduction; Ozone; Photolysis; Ultraviolet Rays; Water Pollutants, Chemical; Water Purificationjournal article10.1016/j.chemosphere.2015.12.046