Naslov
The Use of Electrokinetic Potential in the Interpretation of Adsorption Phenomena. Adsorption of Salicylic Acid on Hematite

Autori
Kovačević, Davor ; Kallay, Nikola ; Antol, Ivana ; Pohlmeier, Andreas ; Lewandowski, Hans ; Narres, Hans-Dieter

Izvornik
Colloids and Surfaces. A (0927-7757) 140 (1998), 1-3; 261-267

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

Ključne riječi
hematite; salicylic acid; adsorption; electrokinetics

Sažetak
The adsorption of salicylic acid on hematite particles and their electrokinetic mobilities were measured as a function of the pH. The equilibrium in the systems was interpreted by the refined adsorption isotherm which considers the dissociation of the acid in the bulk of the solution and the electrostatic interactions between the surface and the adsorbed ions. The later was taken into account through the surface potential which was obtained from the electrokinetics using the Gouy-Chapman theory and introducing the concept of slipping plane separation. It was concluded that singly charged anions are the adsorbable species, which occupy a surface area of 87 A^2 and that adsorption equilibrium constant is logK = 3, 5. The slipping plane separation from the surface was found to be 15 A.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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