众所周知，云母矿物对放射性铯（RCs）的迁移、转化、归趋等环境化学行为起到至关重要的作用；然而，云母矿物风化过程对RCs环境化学行为的微观调控机制仍不清楚。本项目选取典型云母矿物（白云母、黑云母和金云母）作为重点研究对象，结合宏观（模拟风化、吸附和连续提取）和微观（HRTEM、EXAFS和µ-XRF）的实验方法，从分子水平上系统研究RCs在典型云母矿物及其风化产物上的吸附-解吸过程、微观赋存状态等环境化学行为，考察环境因素和RCs吸附过程对云母矿物自身结构的影响，剖析RCs吸附行为对云母矿物风化过程的响应，揭示云母矿物风化过程对RCs吸附行为的微观调控机制。旨在构建能够定量描述和预测RCs在不同环境介质中的吸附模型，为准确、有效评价和预测放射性污染区域RCs的迁移、转化和空间分布等环境化学行为提供重要的理论基础，亦可为放射性污染区域环境的修复和治理提供技术支持。

As is well known, micaceous minerals are very important to control radiocesium migration, transformation and fate behaviors in the environment; however, it remains unclear how the weathering process affects on the environmental behaviors of radiocesium. In this proposal, the typical micaceous minerals with various weathering degrees, i.e., muscovite, biotite and phlogopite, were selected to predominantly explore the sorption-desorption processes， occurrences states and bioavailability of radiocesium at a molecular scale combining batch (such as artificial weathering, sorption, extraction and modelling experiments) and spectroscopic approaches (main extended X-ray absorption fine structure (EXAFS), µ-X-ray fluorescence (µ-XRF) and high resolution transmission electron microscope (HRTEM)). The effect of environmental factors on the structures of the micaceous minerals was estimated firstly before and after weathering. The regulation mechanism on radiocesium sorption behaviors was explored on the micaceous minerals with various weathering processes. The relationship between radiocesium environmental behaviors and micaceous mineral weathering process will be clarified combining the batch and spectroscopic experiments. Finally, a general adsorption model for radiocesium will be constructed to quantitatively describe and predict radiocesium behaviors in a complicated environmental medium. The findings in this proposal can be expected to essentially illustrate radiocesium environmental behaviors such as spatial distribution, migration and transformation at the molecular scale. It could also offer important and necessary technical supports to the remediation of radioactive contaminated areas.