轮胎磨损颗粒在非饱和多孔介质中迁移行为研究
- Study on the Transport of Tire Wear Particles in Unsaturated Porous Media
- 基金项目：地下水资源与环境教育部重点实验室开放课题资助(No.202306ZDKF13)；国家自然科学基金（No.22006112）；天津市自然科学基金（No.20JCQNJC00060）
- 摘要：轮胎磨损颗粒（TWPs）广泛分布于环境中，其在土壤和地下水等介质中的迁移和扩散行为风险日益加剧。本研究通过柱实验比较了原始和老化TWPs在多种模拟水环境及不同饱和度条件下的迁移行为。研究发现，老化TWPs引入新的官能团，改变了其亲水性和表面电负性，从而提高了迁移能力。沉积动力学结果表明，水饱和度的增加与砂柱内气相的存在相关，并与TWPs的迁移能力正相关。此外，本研究还模拟了天然水体对TWPs迁移的影响，并运用Derjaguin-Landau-Verwey-Overbeek (DLVO) 理论定量计算了TWPs胶体与石英砂及胶体间的势能能垒。分析结果显示，在三种天然水体中，TWPs的迁移能力顺序为：人工合成地表水（SSW）>人工合成地下水（SGW）>人工合成雨水（SRW）。这些发现有助于深入理解TWPs在土壤和地下水中的迁移扩散行为，并为制定有效的污染控制策略提供了科学依据。
- Abstract：Tire wear particles (TWPs) are ubiquitous in the environment, and their transport and dispersion in media such as soil and groundwater poses an increasing risk. This study compared the migration properties of pristine and aged TWPs under different simulated water environments and saturation conditions using column experiments. The results reveal that aged TWPs introduce new functional groups, altering their hydrophilicity and surface electronegativity, thereby enhancing their migration capabilities. Deposition kinetics indicate that increased water saturation, which correlates with the presence of a gas phase within the sand column, is positively associated with TWP mobility. Additionally, this study simulated the effect of natural water bodies on the transport of TWPs and quantified the potential energy barriers between TWPs colloids and quartz sand and colloids using Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The analysis results showed that the mobility of TWPs in the three natural water bodies following the order: synthetic surface water (SSW) > synthetic groundwater (SGW) > synthetic rainwater (SRW). These findings contribute to a deeper understanding of the transport and diffusion behaviors of TWPs in soil and groundwater, providing a scientific basis for the development of effective pollution control strategies.
