X-ray photoelectron spectroscopy of fast-frozen hematite colloids in aqueous solutions. 2. tracing the relationship between surface charge and electrolyte adsorption

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.

Shchukarev, AndreyUmeå universitet,Kemiska institutionen(Swepub:umu)ansh0001 (författare)
Umeå universitetKemiska institutionen (creator_code:org_t)

Ingår i:The Journal of Physical Chemistry C: American Chemical Society (ACS)114:6, s. 2613-26161932-74471932-7455

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