Degradation of atrazine by UV/chlorine: Efficiency, influencing factors, and products

被引：290

作者：

Kong, Xiujuan ^{[1
]}

Jiang, Jin ^{[1
]}

Ma, Jun ^{[1
]}

Yang, Yi ^{[1
]}

Liu, Weili ^{[1
]}

Liu, Yulei ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Municipal & Environm Engn, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China

来源：

WATER RESEARCH | 2016年 / 90卷

基金：

中国国家自然科学基金;

关键词：

Atrazine; UV/chlorine; Hydroxyl radical; Chloride radical; ADVANCED OXIDATION PROCESSES; MEDIUM-PRESSURE UV; AQUEOUS-SOLUTION; HYDROGEN-PEROXIDE; RATE CONSTANTS; BY-PRODUCTS; PHOTOLYSIS; MECHANISM; IRRADIATION; OZONATION;

D O I：

10.1016/j.watres.2015.11.068

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this work, the degradation of atrazine by the combination of UV and chlorine (UV/chlorine) due to the formation of radicals during chlorine photolysis was systematically investigated in terms of efficiency, factors that influence the degradation kinetics, as well as oxidation products. It was found that the degradation efficiency of atrazine was enhanced by UV/chlorine compared to UV or chlorine alone. The degradation efficiency of atrazine was favorable at a lower pH, but was inhibited in the presence of natural organic matters. Meanwhile, the initial chlorine dosage, alkalinity, and chloride barely influenced the degradation efficiency under neutral pH conditions. The degradation of atrazine by UV/chlorine was inhibited in real waters (i.e., surface water and ground water) compared to in deionized water but was still more effective than UV alone. The oxidation products of atrazine resulting from de-alkylation, dechlorination-hydroxylation, alkylic-hydroxylation, alkylic-oxidation, alkylic-hydroxylation-dehydration, deamination-hydroxylation, and dechlorination-hydrogenation in UV/chlorine process were detected, which were slightly different from those formed in UV/H2O2 (commonly used UV-based advanced oxidation process). Particularly, the yields of three primary transformation products (desethylatrazine (DEA), desisopropyl-atrazine (DIA), and desethyl-desisopropyl-atrazine (DEIA)) were comparatively quantified in these two processes. The different trend of them formed in UV/chlorine system (DEA:DIA approximate to 4) compared to that formed in UV/H2O2 system (DEA:DIA approximate to 1) could be ascribed to the different reaction reactivities and mechanisms between HO center dot and Cl center dot with atrazine. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：15 / 23

页数：9

共 51 条

[31] Degradation of atrazine by manganese-catalysed ozonation - Influence of radical scavengers [J].