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Adsorption of strontium onto synthetic iron(III) oxide up to high ionic strength systems

García, D.; Lützenkirchen, J. ORCID iD icon 1; Huguenel, M.; Calmels, L.; Petrov, V.; Finck, N. ORCID iD icon 1; Schild, D. ORCID iD icon 1
1 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)

Abstract:

In this work, the adsorption behavior of Sr onto a synthetic iron(III) oxide (hematite with traces of goethite) has been studied. This solid, which might be considered a representative of Fe3+ solid phases (iron corrosion products), was characterized by X-Ray Diffraction (XRD) and X-Ray Photoelectron Spectroscopy (XPS), and its specific surface area was determined. Both XRD and XPS data are consistent with a mixed solid containing more than 90% hematite and 10% goethite. The solid was further characterized by fast acid-base titrations at different NaCl concentrations (from 0.1 to 5 M). Subsequently, for each background NaCl concentration used for the acid-base titrations, Sr-uptake experiments were carried out involving two different levels of Sr concentration (1 × 105 and 5 × 105 M, respectively) at constant solid concentration (7.3 g/L) as a function of −log([H+]/M). A Surface Complexation Model (SCM) was fitted to the experimental data, following a coupled Pitzer/surface complexation approach. The Pitzer model was applied to aqueous species. A Basic Stern Model was used for interfacial electrostatics of the system, which includes ion-specific effects via ion-specific pair-formation constants, whereas the Pitzer-approach involves ion-interaction parameters that enter the model through activity coefficients for aqueous species. ... mehr

Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2075-163X
KITopen-ID: 1000139173
HGF-Programm 32.11.01 (POF IV, LK 01) Nuclear Waste Disposal
Weitere HGF-Programme 32.11.03 (POF IV, LK 01) Fundamental Scientific Aspects
Erschienen in Minerals
Verlag MDPI
Band 11
Heft 10
Seiten Art. Nr.: 1093
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 05.10.2021
Schlagwörter adsorption; radionuclides; strontium; hematite; goethite; ionic strength; surface complexation model; Pitzer model
Nachgewiesen in Dimensions
Web of Science
OpenAlex
Scopus

Verlagsausgabe §
DOI: 10.5445/IR/1000139173
Veröffentlicht am 19.10.2021
Originalveröffentlichung
DOI: 10.3390/min11101093
Scopus
Zitationen: 6
Web of Science
Zitationen: 6
Dimensions
Zitationen: 8
Seitenaufrufe: 123
seit 20.10.2021
Downloads: 130
seit 20.10.2021
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