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

该奖项旨在支持一种综合建模方法的研究，该方法用于预测自然环境系统中固溶比范围内金属离子的吸附。该模型必须能够预测表面配合物的分布，作为固体浓度和pH的函数，并应纳入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用于确定表面配合物的结构作为固体浓度在间歇和循环间歇反应器中的函数。该奖项的提案是根据NSF 88-99提交的，并经过了1991年9月19日的修改，以使研究启动奖公告与NSF 83-57的修改一致，并以NSF 90-77发布。​与能源和原材料生产有关的许多环境问题需要对地表水和地下水系统中污染物的运输和扩散进行可靠的定量预测。污染物溶质与土壤、沉积物和岩石中的矿物表面发生反应，通常会导致每种溶质的一部分分裂到固体上。这种吸附降低了溶质迁移率，这必须在运移模型中加以考虑。该研究结果有望用于制定表面络合反应，所得到的模型将用于模拟环境污染治理过程和系统设计中柱式反应器中金属离子的吸附行为。

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.