Xu Qian, Li Hanbing, Li Sumei, Li Ziyi, Chen Sha, Liang Yixuan, Li Yuyang, Li Jianan, Yuan Mengxin
Department of Environmental Science, College of Environmental Science and Engineering, Beijing University of Technology, Beijing 100124, China.
Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China.
Toxics. 2025 Apr 11;13(4):294. doi: 10.3390/toxics13040294.
The co-occurrence of microplastics (MPs) and antibiotics as emerging contaminants demonstrates significant ecological perturbations in soil matrices. Of particular scientific interest is the potential for MPs to mediate the environmental fate and transport dynamics of co-existing antibiotics. This study investigated MP-mediated ciprofloxacin (CIP) adsorption in lateritic soils. Batch experiments with polyethylene (PE), polypropylene (PP), and poly (ethylene-terephthalate) (PET) revealed soil components dominated CIP retention, while 10% (/) MPs reduced soil adsorption capacity by ≥10.8%, with inhibition intensity following PET > PE > PP. Adsorption thermodynamics exhibited significant pH dependence, achieving maximum sorption efficiency at pH 5.0 (± 0.2), which was approximately 83%. Competitive adsorption analysis demonstrated inverse proportionality between ionic strength and CIP retention, with trivalent cations exhibiting superior competitive displacement capacity compared to mono- and divalent counterparts. Isothermal modeling revealed multilayer adsorption mechanisms governed by hybrid chemisorption/physisorption processes in both soil and MP substrates. Spectroscopic characterization suggested differential adsorption pathways: MP-CIP interactions were primarily mediated through hydrophobic partitioning and π-π electron coupling, while soil-MP composite systems exhibited dominant cation exchange capacity and surface complexation mechanisms. Notably, electrostatic attraction/repulsion forces modulated adsorption efficiency across all experimental conditions, particularly under varying pH regimes. This work advances understanding of co-contaminant dynamics in soil ecosystems, informing risk assessment frameworks.
微塑料（MPs）和抗生素作为新兴污染物的同时出现，表明土壤基质中存在显著的生态扰动。特别值得科学关注的是，微塑料有可能介导共存抗生素在环境中的归宿和迁移动态。本研究调查了微塑料介导的红壤中 ciprofloxacin（CIP）的吸附情况。对聚乙烯（PE）、聚丙烯（PP）和聚对苯二甲酸乙二酯（PET）进行的批量实验表明，土壤成分主导了 CIP 的保留，而 10%（/）的微塑料使土壤吸附能力降低了≥10.8%，抑制强度顺序为 PET > PE > PP。吸附热力学表现出显著的 pH 依赖性，在 pH 5.0（±0.2）时达到最大吸附效率，约为 83%。竞争吸附分析表明，离子强度与 CIP 保留呈反比，三价阳离子相比单价和二价阳离子表现出更强的竞争置换能力。等温线模型显示，土壤和微塑料基质中的多层吸附机制受混合化学吸附/物理吸附过程控制。光谱表征表明存在不同的吸附途径：微塑料与 CIP 的相互作用主要通过疏水分配和 π-π 电子耦合介导，而土壤 - 微塑料复合系统则表现出主要的阳离子交换能力和表面络合机制。值得注意的是，在所有实验条件下，尤其是在不同的 pH 条件下，静电吸引/排斥力调节了吸附效率。这项工作增进了对土壤生态系统中共污染物动态的理解，为风险评估框架提供了依据。
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