Ternary Porosity Effects on Organic Attenuation by Clays in Clay/Organic/Electrolyte Ternary Systems Studied by Clay- Modified Electrodes and Low Angle X-ray Diffraction

该项目的主要重点是在分析和表面 化学程序是利用电化学 粘土修饰电极的性质，以研究传输 应该模仿有机污染物的运动 穿过粘土层离子动力学过程模型 交换（吸附），然后在一个 多孔介质将被开发用于多扫循环 伏安法这些将是快速准显式有限 差异模型，并将在实验中进行测试， 具有多种化合物的粘土修饰电极，所述化合物 应该属于不同的动力学区域该车型将 用于预测电解质形态的影响 最大化扩散通过膜的有机化合物的保留， 粘土层孔隙率在控制反应中的作用将 通过电活性探针原位监测， 将完全由扩散控制，反过来， 由介质的孔隙度控制。一个模型被 开发了一种将良好取向膜的孔隙率与 层间距。 预计结果将提供更好的理解 在粘土中发生的几个重要过程， 用于化学废物处置场的衬里。 其中 是粘土对化学物质的吸附和吸收， 作为溶剂和电解质的粘土的收缩和膨胀 都被吸收了 该项目也有可能导致 涉及快速电化学方法的开发， 测量粘土的孔隙率。

The main focus of this project in the Analytical and Surface Chemistry Program is the utilization of the electrochemical properties of clay modified electrodes to study the transport of species that should mimic the movement of organic pollutants through a clay bed. Models for the kinetic process of ion exchange (adsorption) followed by partitioning reactions in a porous medium will be developed for multisweep cyclic voltammetry. These will be fast quasi-explicit finite difference models, and will be tested experimentally at a clay-modified electrode with a variety of compounds which should fall into different kinetic regions. The model will be used to predict the effect of electrolyte speciation in maximizing retention of an organic compound diffusing through a clay bed. The role of porosity in controlling the reaction will be monitored in situ by an electroactive probe whose current will be controlled purely by diffusion, which is, in turn, controlled by the porosity of the medium. A model has been developed which relates the porosity of a well-oriented film to the interlayer spacing. The results are expected to provide an improved understanding of several important processes which occur in the clays which are used to line chemical waste disposal sites. Among these are the adsorption and absorption of chemicals by clays and the shrinking and swelling of clays as solvents and electrolytes are absorbed. It is also possible that the project will lead to the development of a rapid electrochemical method for measuring the porosity of clays.