X-ray photoelectron spectroscopy of fast-frozen hematite colloids in aqueous solutions. 2. tracing the relationship between surface charge and electrolyte adsorption
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
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.
solution interface, water interface, ion adsorption, crystal faces, xps, goethite, models, coagulation, particles, stability
IdentifiersURN: urn:nbn:se:umu:diva-34317DOI: 10.1021/jp908197fISI: 000274354800033OAI: oai:DiVA.org:umu-34317DiVA: diva2:320529