Photodegradation behaviors of 17β-estradiol in different water matrixes
Photodegradation behaviors of 17β-estradiol in different water matrixes
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17β-雌二醇在不同水基质中的光降解行为
DOI：
10.1016/j.psep.2017.08.044
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发表时间：
2017-11-01
影响因子：
7.8
通讯作者：
Feng Li
中科院分区：
文献类型：
--
作者：
Liu Yongze;Sun Haowan;Feng Li
17β-雌二醇（E2）是一种典型的内分泌干扰化合物，经常在水生环境中检测到，这引起了对其潜在风险的严重担忧。本研究利用300W氙灯模拟照射，研究了E2在超纯水和不同水基质（例如含有HCO3-、NO3-、NO2-和腐殖酸（HA）的水基质中）的光降解行为。结果表明，所有情况下 E2 光降解均遵循准一级动力学。在超纯水中，E2的光降解速率常数和半衰期分别为0.1304h(-1)和5.32 h。直接光解、羟基自由基（(OH)-O-中心点）和单线态氧自由基（102）对E2去除的贡献分别为72%、21.2%和6.8%。不同浓度的HCO3-、NO3-、NO2-、HA对E2光降解行为的影响明显不同。在HCO3-(0.16-2.46 mM)存在下,随着HCO3-浓度的增加,E2去除率从0.1236下降到0.1144h(-1)。淬火实验表明，在HCO3-存在下，(OH)-O-中心点的贡献逐渐从21.2%下降到10.9%。相比之下，在NO3-（0-1.29mM）、NO2-（0-1.29 mM）和HA（0-24mg/L）存在下，E2去除率随着它们浓度的增加而显着增加，猝灭实验表明（OH）-O-中心点的贡献分别增加到24.8%、29.1%和62.4%。可以得出结论，羟基自由基是 E2 间接光降解的主要原因。 (C) 2017 年化学工程师学会。由 Elsevier B.V. 出版。保留所有权利。
17 beta-Estradiol (E2), a typical endocrine disrupting compound, is frequently detected in aquatic environments, and this has caused serious concerns about its potential risks. In this study, the photodegradation behaviors of E2 in ultrapure water and different water matrixes such as those containing HCO3-, NO3-, NO2-, and humic acid (HA) were investigated under simulated irradiation using a 300-W xenon lamp. The results showed that E2 photodegradation in all cases followed pseudo-first-order kinetics. In ultrapure water, the photodegradation rate constant and half-life of E2 were 0.1304h(-1) and 5.32 h, respectively. The contributions of direct photolysis, hydroxyl radicals ((OH)-O-center dot), and singlet oxygen free radicals (102) to E2 removal were 72%, 21.2%, and 6.8%, respectively. The effects of different concentrations of HCO3-, NO3-, NO2-, and HA on the photodegradation behavior of E2 were clearly different. In the presence of HCO3- (0.16-2.46 mM), the E2 removal rate decreased from 0.1236 to 0.1144h(-1) as the HCO3- concentration increased. Quenching experiments revealed that the contribution of (OH)-O-center dot decreased gradually from 21.2% to 10.9% in the presence of HCO3-. In contrast, in the presence of NO3- (0-1.29mM), NO2- (0-1.29 mM), and HA (0-24mg/L), the E2 removal rates increased significantly as their concentrations increased, and quenching experiments revealed that the contribution of (OH)-O-center dot increased to 24.8%, 29.1%, and 62.4%, respectively. It can be concluded that hydroxyl radicals were predominantly responsible for the indirect photodegradation of E2. (C) 2017 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.