微塑料（microplastics, MPs）作为一种新兴污染物受到广泛关注，其进入水环境后易成为抗生素等污染物的载体，从而改变这些污染物原有的环境行为。探究环境中3种常见微塑料（聚乙烯、聚丙烯、聚苯乙烯）对两种磺胺类抗生素（磺胺嘧啶、磺胺甲噁唑）的吸附特性及其作用机制。结果表明：准二级动力学模型更准确地描述了微塑料对抗生素的吸附过程，表明吸附行为涉及多个阶段，并且受到多种因素影响。通过模型拟合发现，Langmuir等温模型更适用于描述磺胺嘧啶（sulf-adiazine, SDZ）和磺胺甲噁唑（sulfame-thoxazole, SMX）在聚乙烯（polyethylene, PE）、聚丙烯（polypr-opylene, PP）、聚苯乙烯（polystyre-ne, PS）上的吸附过程，表明微塑料对这两种抗生素的吸附可能主要表现为单层吸附过程。这些发现不仅揭示了微塑料与抗生素之间的相互作用机制，并且为评估不同微塑料在生态环境中的潜在风险提供了更全面的理论支持。

Microplastics, as an emerging pollutant, are widely concerned about because they are easily turned into carriers for antibiotics and other pollutants once they enter the aquatic environment, thereby altering the original environmental behavior of these pollutants. The adsorption characteristics and mechanisms of three common types of microplastics (polyethylene, polypropylene, and polystyrene) on two sulfonamide antibiotics (sulfadiazine and sulfamethoxazole) were investigated. It is demonstrated that the pseudo-second-order kinetic model more accurately describes the adsorption process of antibiotics onto microplastics, indicating that the adsorption behavior involves multiple stages and is influenced by various factors. It is found through model fitting that the Langmuir isotherm model is more suitable for describing the adsorption of SDZ and SMX on PE, PP, and PS, suggesting that the adsorption of these two antibiotics by microplastics is likely to be a monolayer adsorption process. These findings not only reveal the interaction mechanisms between microplastics and antibiotics but also provide a more comprehensive theoretical basis for assessing the potential ecological risks associated with different types of microplastics.