典型胶体对铊在环境介质中迁移行为的作用规律与机制

铊在环境介质中的迁移行为是地下水和场地铊污染控制与修复的重要课题。进入环境介质的铊会与介质中的有机质、矿物颗粒及生物炭等典型胶体发生相互作用，进而影响铊在环境介质中的空间分布。然而，目前并未有研究考察这些代表性胶体对多孔介质中铊迁移行为的影响。这些知识的缺失将限制我们对铊在实际环境介质中的迁移行为做出正确评估。本项目拟利用迁移动力学模型定量解析铊在典型环境介质中的迁移行为，并结合形态计算探明影响铊迁移特性的关键机制；进而基于试验和理论模型，研究铊与有机质、矿物颗粒及生物炭等代表性胶体共迁移特性，并利用形态计算、表征技术和石英晶体微天平技术等多种手段，分析胶体对铊与介质界面相互作用的影响规律，阐明代表性胶体对铊在环境介质中迁移行为的作用机制。研究成果将为地下水和场地的铊污染的控制策略的评估及相关修复技术的研发提供理论指导，对降低相关地区地下水铊污染风险，保障水环境生态安全有重要意义。

The migration behavior of thallium in environmental media is critical for the control and remediation of groundwaters and sites polluted by thallium. Once entering the environmental medium, thallium will interact with typical colloids, e.g., organic matter, mineral particles, and biochar, and thus affecting their spatial distribution in the environmental medium. However, there is few studies focus on the effect of colloidal organic matter, minerals, and biochars on the migration behavior of thallium in porous media. The lack of these important knowledge will limit us to assess the thallium migration behavior in actual environmental mediums. In this project, we intend to quantitatively study the transport behavior of thallium in the typical water environment medium by using the transport kinetic model, and then find out the key mechanism affecting their transport characteristics by the calculation of their species. More importantly, based on the transport experiments and theoretical models, we will explore the co-transport characteristics of thallium with colloidal organic matter, minerals, or biochars. Through the calculation of thallium species, characterization technologies, and quartz crystal microbalance technology, the impacting mechanism of organic matter, minerals or biochars on the migration behavior of thallium in environmental media was elucidated. The results of this project could provide theoretical guidance for the control of thallium pollution in groundwaters and sites, as well as the development of remediation technology. It is of great significance to reduce the risk of thallium pollution in groundwaters and sites in relevant areas, and finally supporting for the ecological safety of water environment.