在天然水中的聚乙烯微塑料上吸附和
Sylwia Sajkowska1,2, Barbara Leśniewska2
1Doctoral School, University of Bialystok, Ciołkowskiego 1K, 15-245 Białystok, Poland.
Molecules (Basel, Switzerland)
|January 8, 2025
概括
和吸收到聚乙烯微塑料 (PE-MP),即使在老化后. 这种吸附可以将这些金属集中在水生环境中,对生态系统和人类健康构成风险.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 微塑料,特别是聚乙烯微塑料 (PE-MP),是普遍存在的环境污染物.
- 黄金 (Pt) 和 (Pd) 等贵金属在微塑料上的吸附行为尚不清楚.
- 自然环境中的老化过程可以改变微塑料的表面特性.
研究的目的:
- 研究和在原始和老化的聚乙烯微塑料上的吸附行为.
- 了解Pt和Pd吸附在PE-MP上的动力学和异热模型.
- 评估Pt和Pd吸附在自然水中的PE-MP对环境的影响.
主要方法:
- 使用元素分析,FT-IR,SEM-EDX和孔测量对原始和老PE-MP进行表征.
- 在天然湖水中对PE-MP进行Pt和Pd的批量吸附实验 (pH 7.6).
- 动力和同热模拟 (伪二阶,弗洛伊德利希和兰格穆尔模型).
主要成果:
- 衰老过程降解了PE-MP表面,促进了生物膜的形成.
- 在PE-MP上Pt和Pd吸附遵循伪二次动力学.
- 实验数据与弗洛伊德利希和兰格穆尔的异热模型相吻合,表明混合吸附机制.
- 聚乙烯微塑料可以从自然水中吸收和预先缩Pt和Pd.
结论:
- 聚乙烯微塑料作为天然水中的和的吸收剂.
- 这些金属在PE-MP上的吸附可以导致它们的预度和远程运输.
- 由于金属的生物积累,这一过程对水生生态系统和人类健康构成潜在的威胁.
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