Electrochemical properties of Fe and Al hydroxides as affected by different supporting electrolytes

Melis, Pietro and Premoli, Alessandra Maria and Solinas, Vincenzo and Deiana, Salvatore Andrea (1984) Electrochemical properties of Fe and Al hydroxides as affected by different supporting electrolytes. Studi sassaresi: organo ufficiale della Società sassarese di Scienze mediche e naturali. Sez. 3: Annali della Facoltà di Agraria dell'Università di Sassari, Vol. 31 , p. 199-206. ISSN 0562-2662. Article.

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Abstract

Potentiometric titration curves of Fe and Al hydroxides, carried out in presence of different electrolytes (KCI, Kbr, KI, KNO₃, KCIO₄) were elaborated by the Stern theory through a computered program. The zero points of charge (zpc), calculated from the intersection point of the titration curves at different ionic strenght, varied from pH 7.10 to pH 7.65 for Fe hydroxides and from pH 9.10 pH 9.45 for Al hydroxi des. For Fe compounds, a good match was found between the experimental values and those calculated by the Stern model. High deviations were observed only with KCIO₄, in whose presence a lowering of the zpc was registered. Also in Al hydroxides the proposed model was not reliable below zpc, indicating that the surface interac tions are somewhat involved in specific adsorption phenomena.

Item Type:	Article
ID Code:	1870
Status:	Published
Refereed:	Yes
Uncontrolled Keywords:	Fe, Al, hydroxides, zpc, electrolytes
Subjects:	Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:	001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:	Università degli studi di Sassari, Facoltà di Agraria
ISSN:	0562-2662
Deposited On:	18 Aug 2009 10:06

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