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X-ray photoelectron spectroscopy of fast-frozen hematite colloids in aqueous solutions. 2. tracing the relationship between surface charge and electrolyte adsorption
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2010 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 114, no 6, 2613-2616 p.Article in journal (Refereed) Published
Abstract [en]

Colloidal-sized hematite spheroids exposed to aqueous NaCl solutions were investigated by X-ray photoelectron spectroscopy using the fast-frozen technique. The O 1s region provided evidence for (de)protonation reactions of surface (hydr)oxo groups of OH-enriched/O-depleted hematite Surfaces. These results were also correlated to changes in sodium (Na 1s) and chloride (Cl 2p) contents with pH. Electrolyte ion surface loadings were successfully predicted using a classic thermodynamic adsorption model normalized for surface site density. These efforts pointed to ion-specific inner-Helmholtz plane capacitances.

Place, publisher, year, edition, pages
2010. Vol. 114, no 6, 2613-2616 p.
Keyword [en]
solution interface, water interface, ion adsorption, crystal faces, xps, goethite, models, coagulation, particles, stability
Identifiers
URN: urn:nbn:se:umu:diva-34317DOI: 10.1021/jp908197fISI: 000274354800033OAI: oai:DiVA.org:umu-34317DiVA: diva2:320529
Available from: 2010-05-25 Created: 2010-05-25 Last updated: 2017-12-12Bibliographically approved

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Boily, Jean-FrancoisShchukarev, Andrey

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