表面功能组依赖的和对 colloidal 微塑料上的分子吸附的贡献
Ikechukwu Kanu1, Amrit Ojha1, Kalie Adams1
1Department of Chemistry, Ball State University, Muncie, Indiana, USA. msubir@bsu.edu.
Soft matter
|August 15, 2025
概括
微塑料通过静电相互作用吸附有机分子,受水分布和表面化学的影响. 吸附强度和度取决于微塑料的类型和温度,影响水环境中的污染物运输.
科学领域:
- 环境化学环境化学
- 合体和表面科学科学
- 材料科学 材料科学 材料科学
背景情况:
- 微型和纳米塑料 (MNP) 与水生环境中的有机污染物相互作用.
- 了解这些分子相互作用对于预测污染物的命运和运输至关重要.
研究的目的:
- 研究有机分子对模型微塑料 (MP) 的吸附.
- 分析静电相互作用和接口特性对吸附的影响.
- 为了确定吸附的热力学贡献 (输热和输热).
主要方法:
- 用于在现场吸附异热测量的第二波生成.
- 使用的聚乙烯 (PS) 和聚甲基甲酸 (PMMA) 微塑料颗粒具有不同的表面功能群 (-OSO3, -COOH, -NH2/-COOH,阿米丁).
- 分析了取决于温度的吸附同热体,以确定热力学参数.
主要成果:
- 库伦比吸引力显著促进有机分子自发吸附到MPs上.
- 吸附强度是由水分布在接口和特定的功能组相互作用调节的.
- 吸附 吉布斯自由能量, (ΔHads) 和 (ΔSads) 取决于MP表面化学和温度.
- 观察到吸附时的增加,可能与软物质界面结构有关.
结论:
- 静电相互作用,界面水和表面功能群是微塑料上有机分子吸附的关键驱动因素.
- 热力学分析揭示了取决于温度和成分的吸附机制.
- 这些发现凸显了微塑料在环境污染物结合中的合性质的重要性.
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