| Autor: |
Julia Neumann, Jessica Lessing, Sang Soo Lee, Joanne E. Stubbs, Peter J. Eng, Maximilian Demnitz, Paul Fenter, Moritz Schmidt |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Environmental Science & Technology 57(2022)1, 266-276 |
| ISSN: |
1520-5851 |
| Popis: |
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 (001) 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 Y3+ concentration and pH. We observe an inner-sphere (IS) sorption complex at a distance of ~1.5 Å from the surface and an outer-sphere (OS) complex at 3–4 Å. Based on the adsorption height of the IS complex a bidentate, binuclear binding mode, in which Y3+ binds to two terminal oxygens seems most plausible. The total Y coverages of IS and OS species are max. ~1.3 Y3+/AUC for all Y concentrations (AUC: area of the unit cell = 111.4 Ų), which is in the expected range based on the estimated surface charge of orthoclase (001). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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