Selenium(IV) Sorption Onto γ-Al2O3: A Consistent Description of the Surface Speciation by Spectroscopy and Thermodynamic Modeling
| Autor: | Ursula Alonso, Tiziana Missana, Harald Foerstendorf, Katja Schmeide, Stephan Weiss, Karsten Heim, Natalia Mayordomo, Norbert Jordan, Johannes Lützenkirchen |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Extended X-ray absorption fine structure
Chemistry Analytical chemistry Sorption 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Adsorption Isoelectric point Ionic strength Attenuated total reflection Zeta potential Environmental Chemistry 0210 nano-technology Spectroscopy |
| Zdroj: | Environmental Science & Technology. 52:581-588 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.7b04546 |
| Popis: | The sorption processes of Se(IV) onto γ-Al2O3 were studied by in situ Infrared spectroscopy, batch sorption studies, zeta potential measurements and surface complexation modeling (SCM) in the pH range from 5 to 10. In situ attenuated total reflection fourier-transform infrared (ATR FT-IR) spectroscopy revealed the predominant formation of a single inner-sphere surface species at the alumina surface, supporting previously reported EXAFS results, irrespective of the presence or absence of atmospherically derived carbonate. The adsorption of Se(IV) decreased with increasing pH, and no impact of the ionic strength was observed in the range from 0.01 to 0.1 mol L–1 NaCl. Inner-sphere surface complexation was also suggested from the shift of the isoelectric point of γ-Al2O3 observed during zeta potential measurements when Se(IV) concentration was 10–4 mol L–1. Based on these qualitative findings, the acid–base surface properties of γ-Al2O3 and the Se(IV) adsorption edges were successfully described using a 1-pK... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|