Naslov
Evaluation of Equilibrium Parameters of Reactions at Metal Oxide Aqueous Interface

Autori
Čop, Ana ; Kovačević, Davor ; Dragić, Tijana ; Kallay, Nikola

Izvornik
Colloids and surfaces. A, Physicochemical and engineering aspects (0927-7757) 230 (2003); 159-165

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
metal oxide surface ; electrical interfacial layer ; specific adsorption

Sažetak
According to the Surface Complexation Model, charging of a metal oxide surface in aqueous environment is due to interactions of active surface groups with ions from the bulk of the solution. Several models for mechanism of surface reactions were proposed. Interfacial equilibrium is determined by corresponding equilibrium constants, but also with the structure of the electrical interfacial layer. Therefore, evaluation of equilibrium parameters is not a simple task. Traditionally, the measurements of pH dependency of surface charge density was used for that purpose. This article shows that introduction of electrokinetic data produces more reliable results, especially in the case of specific adsorption. If surface charge density and/or adsorption data are not available one may still deduce interfacial equilibrium constants from electrokinetic results combined with measurements of the surface potential.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA