"The Effects of Surface Concentration and Particle Inter- action on the Sturcture and Composition of Surface Complexes"

这一奖项是为了支持对一种综合建模方法的研究，该方法用于预测在自然环境系统中发现的固体与溶液比例范围内的金属离子吸附。该模型必须能够预测作为固体浓度和pH的函数的表面络合物的分布，并且应该包含颗粒相互作用对吸附现象的影响。X射线吸收光谱和原子力显微镜将被用来确定作为间歇和循环间歇反应器中固体浓度的函数的表面络合物的结构。导致该奖项的提案是针对NSF 88-99提交的，NSF 88-99经过9/19/91年9月19日的更改进行了修改，以使研究启动奖公告与NSF 83-57和发布名称为NSF 90-77。与能源和原材料生产有关的许多环境问题需要对污染物在地表水和地下水系统中的迁移和扩散进行可靠的定量预测。污染物溶质与土壤、沉积物和岩石中矿物表面的反应通常会导致每种溶质的一部分分配到固体上。这种吸附降低了溶质的迁移率，这必须在传输模型中考虑到。这项研究的结果有望用来描述表面络合反应，所得到的模型将用于模拟金属离子在塔式反应器中的吸附行为用于环境污染治理流程和系统的设计。

This is an award to support research on a comprehensive modeling approach for predicting metal ion sorption over the range of solid to solution ratios found in natural environmental systems. The model must be capable of predicting the distribution of surface complexes as a function of solids concentration and pH and should incorporate the effects of particle interactions on sorption phenomena. X-Ray absorption spectroscopy and atomic force microscopy will be used to determine the structure of surface complexes as a function of solids concentration in batch and recirculating batch reactors. The proposal leading to this award was submitted in response to NSF 88-99 as modified by changes dated 09/19/91 to make the Research Initiation Award announcement consistent with changes in NSF 83-57 and published as NSF 90-77. Many environmental problems associated with energy and raw material production require reliable quantitative prediction of the transport and dispersion of contaminants in surface and groundwater systems. Reaction of contaminant solutes with mineral surfaces in soils, sediments, and rocks typically causes a portion of each solute to partition onto the solids. This sorption decreases solute mobility, which must be accounted for in transport models. Results of this research are expected to be used to formulate surface complexation reactions and the resulting model will be used to simulate the sorption behavior of metal ions in column reactors used in design of environmental pollution abatement processes and systems.