将各种形状的聚乙烯微塑料附着在二氧化表面上:对相应的卡西尼圆形扩展DLVO模型进行实验验证
Allan Gomez-Flores1, Suheyon Jin1, Hyojeong Nam1
1Department of Earth Resources and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
Journal of hazardous materials
|April 7, 2024
概括
颗粒形状显著影响微塑料与表面的附着. 考虑粒子几何学的新模型改进了附着分析,与较简单的模型不同,这些模型在非球形微塑料中失败了.
科学领域:
- 环境科学 环境科学
- 表面化学 表面化学
- 材料科学 材料科学 材料科学
背景情况:
- 微塑料 (MP) 在环境环境中表现出不同的形状和表面特性.
- 德贾古恩-兰多-维维-奥弗比克 (DLVO) 理论通常用于模拟MP附着,但忽视了粒子形状.
- 了解MP的附着性对于预测其环境命运和运输至关重要.
研究的目的:
- 为了研究微塑料颗粒形状对石英砂粘附的影响.
- 评估扩展DLVO计算的有效性,使用球形和新型模型进行附着分析.
- 确定粒子形状是否是微塑料与表面相互作用的关键因素.
主要方法:
- 批量测试使用球形,梨形和花生形的聚烯微塑料和石英砂进行.
- 对于不同度的NaCl和CaCl2的微塑料,量化了附着效率 (α).
- 使用等效球体模型 (ESM) 和等效卡西尼模型 (ECM) 进行了扩展DLVO计算.
主要成果:
- 与梨状和花生状的微塑料相比,球形微塑料显示出更高的附着效率.
- 相当球体模型 (ESM) 无法准确地解释所有测试的微塑料形状的附着行为.
- 相应的卡西尼模型 (ECM) 通过考虑方向和离子强度,成功解释了非球形微塑料的附着行为.
结论:
- 微塑料颗粒的形状是一个关键因素,必须纳入附着模型.
- 相应的卡西尼模型 (ECM) 为分析微塑料附着物提供了更高的准确性,特别是对于不规则形状的粒子.
- 微塑料附着的准确建模对于环境风险评估和补救策略至关重要.
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