17α-乙炔基雌二醇在微塑料上的吸附和解吸行为

以内分泌干扰物17α-乙炔基雌二醇（EE2）作为目标污染物，系统研究了5种微塑料聚酰胺（PA）、聚乙烯（PE）、聚氨酯（TPU）、聚氯乙烯（PVC）和聚苯乙烯（PS）对EE2的吸附动力学、吸附等温线及解吸作用.微塑料对EE2的吸附动力学和吸附等温线的结果表明，5种微塑料对EE2的吸附能力为PA>TPU>PE>PVC>PS；5种微塑料中TPU和PA具有最大的吸附能力和吸附容量，主要归因于氢键产生的化学吸附；而PE、PS、PVC主要是依靠范德华力的相互作用.因PA和TPU对EE2的吸附能力更强，两者的解吸量均高于其他3种物质.采用解吸率来反映不同微塑料的解吸性能，发现EE2在PS中的解吸率最高，PA和TPU上解吸率相对较低.采用单因素重复测量方差分析统计学方法对EE2在5种微塑料上的解吸特性进行分析，EE2在PS与其他4种微塑料之间表现为显著性差异，其余微塑料两两之间无显著性差异；尽管肠胃液中解吸率高于去离子水，但两者并无显著性差异.

Adsorption and desorption behavior of 17α-ethinyl estradiol on microplastics

The endocrine disruptor 17α-Ethinylestradiol (EE2) was used as the target pollutant to study the adsorption kinetics, adsorption isotherm and desorption of five kinds of microplastics:polyamide (PA), polyethylene (PE), polyurethane (TPU), polyvinyl chloride (PVC) and polystyrene (PS). The results of adsorption kinetics and adsorption isotherm showed that the adsorption capacity of five kinds of microplastics for EE2 was in the order of PA > TPU > PE > PVC > PS. TPU and PA had the largest adsorption capacity, which was mainly due to the chemical adsorption of hydrogen bonds; while PE, PS and PVC mainly depended on the interaction of van der Waals force. Because PA and TPU had stronger adsorption capacities for EE2, their desorption capacity was also higher than the other three substances. When the desorption rate was used to reflect the desorption performance of different microplastics, it was found that the desorption rate of EE2 in PS was the highest, while that in PA and TPU were relatively low. Single factor repeated measurement ANOVA was used to analyze the analytical characteristics of EE2 on five kinds of microplastics. There was significant difference between PS and the other four kinds of microplastics, but no significant difference was found in pairwise comparison among these four kinds of microplastics. Although the desorbing rate in gastrointestinal juice was higher than that of deionized water, there was no statistical significance between them.