X-ray Absorption Spectroscopic Quantification and Speciation Modeling of Sulfate Adsorption on Ferrihydrite Surfaces.
作者： Chunhao Gu , Zimeng Wang , James D. Kubicki , Xiaoming Wang , Mengqiang Zhu
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摘要: Sulfate adsorption on mineral surfaces is an important environmental chemical process, but the structures and respective contribution of different complexes under various conditions are unclear. By combining sulfur K-edge XANES EXAFS spectroscopy, quantum calculations, surface complexation modeling (SCM), we have shown that sulfate forms both outer-sphere bidentate–binuclear inner-sphere ferrihydrite surfaces. The relative fractions vary with pH, ionic strength (I), sample hydration degree (wet versus air-dried), their remained same. complex loading decreases increasing pH while remaining unchanged I. At I = 0.02 0.1 M, reaches maximum at ∼5 then whereas it monotonically 0.5 M. These observations result from a combination ionic-strength effect, dependence ...
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