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Anion adsorption on oxide surfaces: Inclusion of the water dipole in modeling the electrostatics of ligand exchange

机译:阴离子在氧化物表面的吸附:水偶极子在配体交换静电建模中的应用

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摘要

Adsorption of aqueous anions, such as sulfate, arsenite, and oxalate, to oxide surfaces is important in the retardation of toxic species in the environment, but predicting the surface speciation as a function of environmental parameters is a major challenge. Recent laboratory spectroscopic studies defining surface speciation must be integrated with surface complexation models. However, the latter have neglected the electrostatic work of desorption of water dipoles in treating anion adsorption by ligand exchange. Taking this effect into account permits close quantitative description of anion adsorption and the prediction of anion surface speciation as a function of pH, ionic strength, and surface coverage in agreement with spectroscopic results.
机译:水性阴离子(例如硫酸根,亚砷酸根和草酸根)在氧化物表面的吸附对于延缓环境中有毒物质的吸收很重要,但是预测作为环境参数的表面形态是一项重大挑战。定义表面形态的最新实验室光谱研究必须与表面络合模型整合在一起。然而,后者在通过配体交换处理阴离子吸附中忽略了水偶极解吸的静电作用。考虑到这种影响,可以对阴离子吸附进行紧密的定量描述,并根据光谱结果对pH,离子强度和表面覆盖率的函数进行阴离子表面形态预测。

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