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首页> 外文期刊>Environmental Science & Technology: ES&T >Y(lll) Sorption at the Orthoclase (001) Surface Measured by X-ray Reflectivity
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Y(lll) Sorption at the Orthoclase (001) Surface Measured by X-ray Reflectivity

机译：Y(lll) Sorption at the Orthoclase (001) Surface Measured by X-ray Reflectivity

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摘要

Interactions of heavy metals with charged mineral surfaces control their mobility in the environment. Here, we investigate the adsorption of Y(III) onto the orthoclase (OOl) basal plane, the former as a representative of rare earth elements and an analogue of trivalent actinides and the latter as a representative of naturally abundant K-feldspar minerals. We apply in situ high-resolution X-ray reflectivity to determine the sorption capacity and molecular distribution of adsorbed Y species as a function of the Y3+ concentration, [Y3+], at pH 7 and 5. With [Y3+] > 1 mM at pH 7, we observe an inner-sphere (IS) sorption complex at a distance of ~1.5 A from the surface and an outer-sphere (OS) complex at 3—4 A. Based on the adsorption height of the IS complex, a bidentate, binuclear binding mode, in which Y3+ binds to two terminal oxygens, is proposed. In contrast, mostly OS sorption is observed at pH S. The observed maximum Y coverage is ~1.3 Y3+/Auc (Auc: area of the unit cell = 111.4 A2) for all the investigated pH values and Y concentrations, which is in the expected range based on the estimated surface charge of orthoclase (OOl).

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