Adsorption of Organic Acids on Metal Oxides. The Umbrella Effect

Kovačević, Davor and Kobal, Ivan and Kallay, Nikola (1998) Adsorption of Organic Acids on Metal Oxides. The Umbrella Effect. Croatica Chemica Acta, 71 (4). pp. 1139-1153. ISSN 0011-1643

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Abstract

Simultaneous interpretation of electrokinetic and adsorption data for organic ions at metal oxide surfaces is introduced. It is shown that, for the salicylic acid / hematite system, the singly charged salicylate ions react with surface –OH, groups releasing one water molecule. The salicylate ions, when bound to the surface, exhibit a pronounced "Umbrella effect", i.e. each relatively large organic ion covers about four to six surface –OH, excluding them from the further adsorption process. Within the electrical interfacial layer, the salicylate ions are located in the plane near the onset of the diffuse layer. It is demonstrated that the interpretation of adsorption data solely may lead to erroneous conclusions regarding the mechanism of binding and the structure of the interfacial layer. Electrokinetic measurements provide useful information, enabling the solution of the above problem.

Item Type: Article
Date: 1998
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Faculty of Science > Department of Chemistry
Publisher: Hrvatsko kemijsko društvo
Related URLs:
Depositing User: mag. bibl. Ana Šafran
Date Deposited: 28 May 2014 12:06
Last Modified: 28 May 2014 12:06
URI: http://digre.pmf.unizg.hr/id/eprint/1883

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