In recent years, tire wear particles (TWP), as the significant proportion of microplastics (MPs), has adsorbed much attention due to its widespread presence in aquatic ecosystem. Compared with typical MPs, TWP exists significant differences in composition, additives, characteristics and so on. With TWP and polypropylene (PP) as target MPs, Cd²⁺ and Pb²⁺ as target pollutants, the adsorption-desorption characteristics of heavy metal ions on original and aged MPs were studied. Compare with the PP, the S_BET of TWP increased more significantly after the UV ageing process. Meanwhile, the zeta potential of TWP increased from −8.01 to −14.6 mV and PP from −5.36 to −9.52 mV, and the surface of the TWP were more negatively-charged. In addition, the hydrophilicity of MPs enhanced due to the increased oxygen-containing functional groups after ageing process. Compared with PP, the physicochemical properties of TWP changed more obviously during UV ageing processes. The adsorption results showed that the pseudo-second-order model could better describe the adsorption processes of Cd²⁺ and Pb²⁺ on MPs. Meanwhile, the orders of adsorption capacity of MPs for Cd²⁺ and Pb²⁺ were aged TWP > aged PP > original TWP > original PP. The phenomenon of adsorption confirmed that TWP had better vector effects for heavy metal ions than PP, and the ageing processes could enhance the adsorption capacity of MPs. Moreover, the desorption results demonstrated that, compared with PP, the TWP (with higher adsorption capacity) also had the better desorption capacity for heavy metal ions in simulated gastric fluid. Compared with PP, the TWP might cause a more serious hazard to aquatic environment and organisms. These investigations would contribute to assessing the potential environmental and biological risk of TWP, especially considering the effect of the ageing process.

近年来，轮胎磨损颗粒（TWP）作为微塑料（MPs）的重要组成部分，由于其在水生生态系统中的广泛存在而备受关注。与典型MP相比，TWP在成分，添加剂，特性等方面存在显着差异。以TWP和聚丙烯（MP）为目标MP，Cd ²⁺和Pb ²⁺为目标污染物，研究了重金属离子在原始MP和老化MP上的吸附-解吸特性。与PP，S _BET比较在紫外线老化过程之后，TWP的增加更为显着。同时，TWP的ζ电位从-8.01增加到-14.6mV，PP从-5.36增加到-9.52mV，并且TWP的表面带更多的负电荷。此外，由于老化过程后含氧官能团的增加，MP的亲水性增强。与PP相比，TWP在紫外线老化过程中的理化性质变化更为明显。吸附结果表明，拟二级模型可以更好地描述Cd ²⁺和Pb ²⁺在MPs上的吸附过程。同时，MPs对Cd ²⁺和Pb ²⁺的吸附能力顺序为分别为TWP年龄> PP年龄>原TWP>原PP。吸附现象证实，TWP对重金属离子的载体作用优于PP，且老化过程可增强MPs的吸附能力。此外，解吸结果表明，与PP相比，TWP（具有更高的吸附容量）在模拟胃液中对重金属离子也具有更好的解吸容量。与PP相比，TWP可能会对水生环境和生物造成更严重的危害。这些调查将有助于评估TWP的潜在环境和生物风险，尤其是考虑到老化过程的影响。