Electrical Interfacial Layer at Hematite/Dicarboxylic Acid Aqueous Interface

Salopek, Jasmina and Kallay, Nikola and Kovačević, Davor (2012) Electrical Interfacial Layer at Hematite/Dicarboxylic Acid Aqueous Interface. Croatica Chemica Acta, 85 (4). pp. 553-558. ISSN 0011-1643

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Abstract

The interfacial properties of the system hematite/dicarboxylic acid were investigated in the presence of sodium perchlorate by means of adsorption, zeta potential and surface potential measurements. Maleic and fumaric acid were used as dicarboxylic acids. No significant difference in the surface potential values of hematite with and without the presence of dicarboxylic acids was observed. On the other hand, the zeta potential and the corresponding isoelectric point values obtained after adsorption of fumaric and maleic acids on hematite differ significantly from the zeta potential values of pure hematite. The parameters characterizing the electrical interfacial layer were determined on the basis of simultaneous interpretation of experimental data showing that there are some differences in adsorption behavior of two investigated dicarboxylic acids. The obtained equilibrium constant for adsorption of fumaric acid (logK° = 4.9 ± 0.2) is higher than the same constant obtained for adsorption of maleic acid (logK° = 4.0 ± 0.1) and the value of C1 was in both cases determined as 2.2 ± 0.3 F m–2.

Item Type: Article
Keywords: hematite; maleic acid; fumaric acid; adsorption; zeta potential; surface potential
Date: 2012
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Faculty of Science > Department of Chemistry
Publisher: Hrvatsko kemijsko društvo
Related URLs:
Depositing User: Branka Maravic
Date Deposited: 07 May 2014 12:41
Last Modified: 09 May 2014 12:17
URI: http://digre.pmf.unizg.hr/id/eprint/1058

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