Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, F-63000 Clermont-Ferrand, France; INSA Lyon, DEEP, 34 Avenue des Arts, 69621 Villeurbanne Cedex, France.
INSA Lyon, DEEP, 34 Avenue des Arts, 69621 Villeurbanne Cedex, France.
J Hazard Mater. 2021 Mar 5;405:124693. doi: 10.1016/j.jhazmat.2020.124693. Epub 2020 Nov 27.
In the present work, the degradation of three estrogens (17β-estradiol (E2), estrone (E1) and 17α-ethinylestradiol (EE2)) was investigated under photoactivation of hydrogen peroxide and persulfate. Lab-scale irradiation experiments showed that both UVA and UVB radiations are able to photoactivate the oxidant precursors, although UVB is more efficient to generate radicals and therefore to degrade the targets. The efficiency of both oxidant precursors was investigated showing higher efficiency in the system with persulfate. The pseudo-first order degradation rate constants and the second order rate constants between the hydroxyl or the sulfate radicals and estrogens were measured. In order to evaluate the process efficiency in real treatment conditions, the degradation of the estrogens spiked into sewage treatment plant effluent was studied. Measurements of second order rate constants between the radical and the effluent organic matter by laser flash photolysis allowed to understand the involved quenching mechanisms. A Yeast Estrogen Screen (YES) assay was used to follow the decrease in estrogenic activity during the estrogen degradation. This assay permitted to ensure that the studied processes are not only able to degrade the estrogens but also to remove their estrogenic activity.
在本工作中，研究了在过氧化氢和过硫酸盐的光激活下三种雌激素（17β-雌二醇（E2）、雌酮（E1）和 17α-乙炔基雌二醇（EE2））的降解。实验室规模的辐照实验表明，UVA 和 UVB 辐射都能够光激活氧化剂前体，尽管 UVB 更有效地生成自由基，从而降解目标物。研究了两种氧化剂前体的效率，结果表明过硫酸盐体系的效率更高。测量了羟基或硫酸根自由基与雌激素之间的假一级降解速率常数和二级速率常数。为了评估实际处理条件下的工艺效率，研究了污水厂出水加标雌激素的降解情况。通过激光闪光光解测量自由基与废水中有机物之间的二级速率常数，了解了涉及的猝灭机制。使用酵母雌激素筛选（YES）测定法来跟踪雌激素降解过程中雌激素活性的降低。该测定法确保所研究的过程不仅能够降解雌激素，而且还能够去除其雌激素活性。
