Sorption Characteristics and Site Energy Distribution Theory of Typical Estrogens on Microplastics

被引：1
|
作者：
Liu J.-Y. [1 ,2 ]
Zheng M.-M. [1 ,2 ]
Hu J.-W. [2 ]
Liu W.-R. [2 ]
He D.-C. [2 ]
Pan J. [1 ]
机构：
[1] College of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing
[2] South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou
来源：
Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 04期
关键词：
adsorption; energy distribution; estrogens; microplastics (MPs); polyethylene(PE);
D O I：
10.13227/j.hjkx.202205050
中图分类号：
学科分类号：
摘要：
Microplastics (MPs) and estrogens are high-profile emerging contaminants at present, and MPs might become the carrier of estrogens in the environment and induce combined pollution. To study the adsorption behavior of polyethylene (PE) microplastics to typical estrogens, the adsorption isothermal properties of the six estrogens [estrone (E1), 17α-estradiol (17α-E2), 17β-estradiol (17β-E2), estriol (E3), diethylstilbestrol (DES), and ethinylestradiol (17α-EE2)] in single-solute and mixed-solute systems were studied through batch equilibrium adsorption experiments, in which the PE microplastics before and after adsorption were characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). Then, the site energy distribution theory of the adsorption of six estrogens on PE microplastics was further analyzed based on the Freundlich model. The results showed that the adsorption process of selected estrogens with two concentrations (100 μg.L - 1 and 1 000 μg.L - 1 ) on PE were more consistent with the pseudo-second order kinetic model. The increase in initial concentration reduced the equilibrium time of adsorption and increased the adsorbing capacity of estrogens on PE. In the single system (one estrogen) or mixed system (six estrogens) with different concentrations (10 μg.L - 1 -2 000 μg.L - 1 ), the Freundlich model showed the best fitting effect for the adsorption isotherm data (R2 >0. 94). The results of isothermal adsorption experiments and XPS and FTIR spectra showed that the adsorption of estrogens on PE in the two systems was heterogeneous adsorption, and hydrophobic distribution and van der Waals forces were the principal factors in the process of adsorption. The occurrence of C_O_C (in only the DES and 17α-EE2 systems) and O_C 詤O (in only the 17α-EE2 system) indicated that the adsorption of synthetic estrogens on PE was affected slightly by chemical bonding function, but no obvious effects were observed for natural estrogens. The results of site energy distribution analysis showed that, compared with the single system, the adsorption site energy of each estrogen shifted to the high-energy region in its entirety in the mixed system, and the site energy increased by 2. 15%-40. 98%. The energy change in DES was the most significant among all of the estrogens, indicating its competitive advantage in the mixed system. The above results of this study can provide some reference for the study of adsorption behavior, mechanism of action, and environmental risks under the coexisting condition of organic pollutants and MPs. © 2023 Science Press. All rights reserved.
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页码：2158 / 2167
页数：9
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