Adsorption-desorption behavior of sulfamethazine on biodegradable polyester microplastics: Effects of sunlight vs. sewage microbial exposure

文献类型： 外文期刊

第一作者： Li, Yuan

作者： Li, Yuan;Xu, Hongbin;Li, Yuan;Wang, Xuejiang;Wang, Yuan;Xia, Siqing;Zhao, Jianfu;Wang, Yuan

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关键词： Biodegradable microplastics; Antibiotic; Adsorption; Microbial exposure; Sunlight exposure

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）

ISSN： 2213-2929

年卷期： 2025 年 13 卷 5 期

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收录情况： SCI

摘要： The co-occurrence of biodegradable microplastics (BMPs) and antibiotics in wastewater poses environmental concern. However, the effects of different environmental ageing processes on antibiotic-BMPs interfacial interactions remain inadequately characterized. This study systematically compared the adsorption-desorption behaviour of sulfamethazine (SM2) onto biodegradable poly(butylene succinate) microplastics (PBS-MPs) subjected to sewage microbial exposure (B-PBS-MPs) and sunlight exposure (P-PBS-MPs). Kinetics of SM2 adsorbed on all MPs conformed to the Elovich model, indicating that the adsorption rates synergistic controlled by liquidfilm and intra-particle diffusion. The maximum adsorption capacities predicted by Langmuir model increased from 76.52 mu g/g for PBS-MPs to 316.58 mu g/g for B-PBS-MPs and 351.49 mu g/g for P-PBS-MPs, indicating that sunlight exposure exerted more pronounced adsorption enhancement than microbial exposure. Mechanistic divergences were observed: pristine PBS-MPs exhibited Langmuir-type monolayer adsorption dominated by nonbonding interactions, whereas sunlight-exposed P-PBS-MPs followed Freundlich-type multilayer adsorption driven by hydrogen bonding and van der Waals forces. For microbial-exposed B-PBS-MPs, adsorption obeyed the Langmuir-Freundlich model-micropore filling may dominated at low SM2 concentrations, while complexation of SM2 and biofilm-associated extracellular polymeric substances (EPS) prevailed at higher concentrations. The results of desorption hysteresis indicated the most stable SM2 retention in microbial-exposed MPs via SM2-EPS chemical bonds and the least stable SM2 adsorption in sunlight-exposed MPs due to the weak binding force. These findings demonstrate that ageing differentiates biodegradable MPs into distinct antibiotic vectors: microbial exposure enhanced adsorption capacity and stability, whereas sunlight exposure elevated remobilization risks. This work contributes to the assessment of the compounded environmental risks of BMPs and antibiotics.

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