微塑料对土壤中西普洛素吸附动力学和机制的影响
Qian Xu1,2, Hanbing Li1,2, Sumei Li1,2
1Department of Environmental Science, College of Environmental Science and Engineering, Beijing University of Technology, Beijing 100124, China.
Toxics
|April 25, 2025
概括
微塑料 (MP) 可以改变土壤中的抗生素吸附. 这项研究发现,MPs降低了西普洛素吸附,PET是最具影响力的,突出了土壤环境中复杂的共同污染物相互作用.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 生态毒理学 生态毒理学
背景情况:
- 新兴污染物如微塑料 (MP) 和抗生素在土壤中同时存在,构成生态风险.
- 国会议员可能会影响环境行为和同时存在的抗生素的运输.
研究的目的:
- 在横层土壤中研究微塑料介导的西普洛素吸附 (CIP).
- 确定不同类型的塑料对抗生素保留的影响.
- 阐明控制土壤中MP-抗生素相互作用的机制.
主要方法:
- 使用聚乙烯 (PE),聚烯 (PP) 和聚乙烯-甲甲酸盐 (PET) MP 的批量吸附实验.
- 吸附热力学,pH依赖度和离子强度效应的分析.
- 异热建模和光谱表征 (FTIR,SEM-EDS) 用于确定吸附机制.
主要成果:
- 土壤成分主导着西普罗夫洛克萨的吸附.
- 10%的MP降低了土壤吸附能力≥10.8%,而PET>PE>PP则受到抑制.
- 在pH值5.0 (±0.2) 发生最大吸附效率,约为83%.
- 通过混合化学吸收/物理吸收观察到多层吸附.
- MP-CIP相互作用涉及疏水分离和 π-π 合;土壤-MP 系统显示了离子交换和表面复杂化.
结论:
- 微塑料显著改变土壤中西普洛素吸附动态.
- 吸附取决于pH值,并受到离子强度和离子价值的影响.
- 了解这些相互作用对于土壤风险评估和共同污染物的环境管理至关重要.
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