分析化学2026，Vol.54Issue(2)：304-312,中插32-中插34,12.DOI:10.19756/j.issn.0253-3820.251337
多种老化与生物膜协同作用下聚丙烯微塑料对铅离子的吸附机制研究
Study on Adsorption Mechanism of Polypropylene Microplastics for Lead Ion Under Synergistic Effects of Multiple Aging and Biofilms
摘要
Abstract
Polypropylene(PP)microplastics are one of the most common types of plastics in the environment,which are widely derived from disposable packaging materials,daily necessities,and medical protective equipment,etc.They undergo aging due to various external forces such as light exposure,temperature changes,and hydrodynamic disturbances,which in turn affects their interfacial adsorption of other pollutants.In this study,medical masks were selected as the experimental PP materials,and typical aging processes were simulated through freeze-thaw cycles,artificial wave action,and ultraviolet irradiation.Natural seawater was used to cultivate biofilm growth on the microplastic surface.The adsorption characteristics and mechanisms of Pb(Ⅱ)on PP microplastics under different aging modes and biofilm loading were systematically evaluated.The results showed that all three aging methods promoted the formation of oxygen-containing functional groups and increased the number of active sites on the microplastic surface.Among them,UV aging and wave-induced abrasion with mixed sand produced the highest degree of oxidation and the most significant enhancement in Pb(Ⅱ)adsorption capacity.Biofilm loading further altered the surface energy-level structure and types of adsorption sites,markedly strengthening the binding capacity for Pb(Ⅱ).Kinetic analysis indicated that Pb(Ⅱ)adsorption followed a pseudo-second-order model dominated by chemisorption.Statistical physics modeling revealed that biofilm introduction transformed the adsorption system from a single-energy-site to a dual-energy-site configuration and induced evident multi-ion aggregation behavior.This study demonstrated a synergistic effect between aging-induced surface oxidation and biofilm-driven functional group proliferation,jointly regulating the interfacial adsorption process of Pb(Ⅱ)on microplastics.关键词
微塑料/生物膜/老化/吸附特性/铅离子Key words
Microplastics/Biofilm/Aging/Adsorption/Lead ion引用本文复制引用
范伟,殷家璇,郑沛,汪明烨,孙承君,李景喜..多种老化与生物膜协同作用下聚丙烯微塑料对铅离子的吸附机制研究[J].分析化学,2026,54(2):304-312,中插32-中插34,12.基金项目
南亚防灾减灾能力建设合作项目(No.WJ1525011)和中国-东盟国家蓝色伙伴关系建设项目(No.WJ1325011)资助. Supported by the Cooperations on Capacity Building for Marine Disaster Prevention and Mitigation in South Asia(No.WJ1525011)and the China-ASEAN Blue Partnership Construction Project(No.WJ1325011). （No.WJ1525011）
