X-ray Photoelectron Spectroscopy of Fast-Frozen Hematite Colloids in Aqueous Solutions. 2. Tracing the Relationship between Surface Charge and Electrolyte Adsorption

被引：24

作者：

Boily, Jean-Francois ^{[1
]}

Shchukarev, Andrei ^{[1
]}

机构：

[1] Umea Univ, Dept Chem, SE-90187 Umea, Sweden

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 06期

关键词：

CRYSTAL FACES; XPS; WATER; MODELS; COAGULATION; PARTICLES; STABILITY; HYDROXYL;

D O I：

10.1021/jp908197f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：2613 / 2616

页数：4

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