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Title: Dissolution of nickel ferrite in aqueous solutions containing oxalic acid and ferrous salts

Abstract

The dissolution of nickel ferrite in oxalic acid and in ferrous oxalate-oxalic acid aqueous solution was studied. Nickel ferrite was synthesized by thermal decomposition of a mixed tartrate; the particles were shown to be coated with a thin ferric oxide layer. Dissolution takes place in two stages, the first one corresponding to the dissolution of the ferric oxide outer layer and the second one being the dissolution of Ni{sub 1.06}Fe{sub 1.96}O{sub 4}. The kinetics of dissolution during this first stage is typical of ferric oxides: in oxalic acid, both a ligand-assisted and a redox mechanism operates, whereas in the presence of ferrous ions, redox catalysis leads to a faster dissolution. The rate dependence on both oxalic acid and on ferrous ion is described by the Langmuir-Hinshelwood equation. In the second stage, Langmuir-Hinshelwood kinetics also describes the dissolution of iron and nickel from nickel ferrite. It may be concluded that oxalic acid operates to dissolve iron, and the ensuing disruption of the solid framework accelerates the release of nickel.

Authors:
; ; ;
Publication Date:
Research Org.:
Comision Nacional de Energia Atomica, Buenos Aires (AR)
OSTI Identifier:
20080255
Resource Type:
Journal Article
Journal Name:
Journal of Colloid and Interface Science
Additional Journal Information:
Journal Volume: 225; Journal Issue: 2; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0021-9797
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 22 GENERAL STUDIES OF NUCLEAR REACTORS; DISSOLUTION; NICKEL COMPOUNDS; FERRITE; OXALIC ACID; HEAT TRANSFER; NUCLEAR POWER PLANTS

Citation Formats

Figueroa, C.A., Sileo, E.E., Morando, P.J., and Blesa, M.A. Dissolution of nickel ferrite in aqueous solutions containing oxalic acid and ferrous salts. United States: N. p., 2000. Web. doi:10.1006/jcis.2000.6734.
Figueroa, C.A., Sileo, E.E., Morando, P.J., & Blesa, M.A. Dissolution of nickel ferrite in aqueous solutions containing oxalic acid and ferrous salts. United States. doi:10.1006/jcis.2000.6734.
Figueroa, C.A., Sileo, E.E., Morando, P.J., and Blesa, M.A. Mon . "Dissolution of nickel ferrite in aqueous solutions containing oxalic acid and ferrous salts". United States. doi:10.1006/jcis.2000.6734.
@article{osti_20080255,
title = {Dissolution of nickel ferrite in aqueous solutions containing oxalic acid and ferrous salts},
author = {Figueroa, C.A. and Sileo, E.E. and Morando, P.J. and Blesa, M.A.},
abstractNote = {The dissolution of nickel ferrite in oxalic acid and in ferrous oxalate-oxalic acid aqueous solution was studied. Nickel ferrite was synthesized by thermal decomposition of a mixed tartrate; the particles were shown to be coated with a thin ferric oxide layer. Dissolution takes place in two stages, the first one corresponding to the dissolution of the ferric oxide outer layer and the second one being the dissolution of Ni{sub 1.06}Fe{sub 1.96}O{sub 4}. The kinetics of dissolution during this first stage is typical of ferric oxides: in oxalic acid, both a ligand-assisted and a redox mechanism operates, whereas in the presence of ferrous ions, redox catalysis leads to a faster dissolution. The rate dependence on both oxalic acid and on ferrous ion is described by the Langmuir-Hinshelwood equation. In the second stage, Langmuir-Hinshelwood kinetics also describes the dissolution of iron and nickel from nickel ferrite. It may be concluded that oxalic acid operates to dissolve iron, and the ensuing disruption of the solid framework accelerates the release of nickel.},
doi = {10.1006/jcis.2000.6734},
journal = {Journal of Colloid and Interface Science},
issn = {0021-9797},
number = 2,
volume = 225,
place = {United States},
year = {2000},
month = {5}
}