聚酰胺微塑料吸附水环境中对氯间二甲苯酚和卡马西平的行为研究

Study on the adsorption behavior of p-chloro-m-xylenol andcarbamazepine in water environment by polyamide microplastics

为了评估微塑料对有机污染物的载体效应,以聚酰胺(PA)微塑料为研究对象,考察其在水环境中对对氯间二甲苯酚(PCMX)和卡马西平(CBZ)的吸附行为。结果表明:准二级动力学模型和Freundlich模型对PA微塑料的吸附过程具有更好的拟合效果,说明整个吸附过程是为非均匀表面多层吸附,同时涉及颗粒内扩散、疏水分配作用多阶段共同作用;不同的pH值和盐度会影响静电作用或离子交换程度,使吸附效率发生改变。该研究可为微塑料作为载体迁移有机物污染物提供理论依据。

In order to evaluate the carrier effect of microplastics on organic pollutants,the adsorption behavior of p-chloro-m-xylenol(PCMX)and carbamazepine(CBZ)on polyamide(PA)microplastics in water environment was investigated.The results show that the adsorption process of PA microplastics was accurately comepleted by the Freundlich and pseudo-second-order kinetic theories,indicating that the whole adsorption process is a multi-layer adsorption of heterogeneous surface dominated by chemical adsorption,and involves the multi-stage interaction of intra-particle diffusion and hydrophobic distribution.Different pH and salinity will affect the degree of electrostatic interaction or ion exchange,which will change the adsorption efficiency.This study can provide a theoretical basis for microplastics as carriers to migrate organic pollutants.