Abstract：Microplastics have been driving extensive attention due to their widespread existence and potential threats. 17α-Ethinyl estradiol (EE2) and bisphenol A(BPA) were used as target pollutants, and microplastic polyamide (PA) was used as adsorbent, to study the adsorption behavior of estrogen coexisting on microplastics. The adsorption isothermal properties of the two in single solute and double solute systems were studied by isothermal adsorption experiments. The adsorption characteristics of the two solvend on PA microplastics were further analyzed based on the site energy distribution theory. We charaterized PA before and after adsorption by X-ray photoelectron spectroscopy(XPS), and Fourier transform infrared spectroscopy(FTIR). We explored likely adsorption mechanisms of PA microplastics on different system(BPA-only, EE2-only, BPA-EE2) adsorption. The results of isothermal adsorption experiments and XPS and FTIR spectra showed heterogeneous adsorption of three adsorption systems on PA and hydrophobic distribution and hydrogen bonding are the main adsorption mechanisms. The results of site energy distribution analysis showed, in the system that contained the same concentration (1~4mg/L) of single contaminants, the adsorption sites of bisphenol A were mainly distributed in the high energy level, whereas the adsorption sites of 17α-acetylenestradiol were mainly concentrated in the low energy level. In the system containing the concentration (1~4mg/L) of dual contaminants, exponential decrease was found for the distribution functions of both substances with the increasing site energy, the decrease trend of bisphenol A was more moderate, and the distribution of adsorption sites was more uniform. The average site energy and site energy heterogeneity of bisphenol A increased by 0.749% and 2.483%, respectively, and the number of adsorption sites was decreased by 10.852%; In the dual-contaminant system, the average site energy of EE2 decreased by 0.813%, the site energy heterogeneity increased by 1.870%, and the number of adsorption sites increased by 42.429%. In the competitive adsorption of bisphenol A and EE2 on PA, microplastics, EE2was dominant. This study has certain reference significance for the competitive adsorption of coexisting organic pollutants.
蒋晖, 刘秀丽, 孙姣霞, 胡莺, 周金山, 刘欣, 陈松, 蔡文全. BPA和EE2在PA微塑料上竞争吸附的位点能量[J]. 中国环境科学, 2021, 41(12): 5736-5746.
JIANG Hui, LIU Xiu-li, SUN Jiao-xia, HU Ying, ZHOU Jin-shan, LIU Xin, Chen Song, Cai Wen-quan. Competitive adsorption characteristics of BPA and EE2 on PA microplastics by site energy distribution theory. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(12): 5736-5746.
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