Ferric hydrous oxide sols I. Monodispersed basic iron(III) sulfate particles |
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| Authors: | Egon Matijevi&#x; Ronald S Sapieszko James B Melville |
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| Institution: | Institute of Colloid and Surface Science, and Department of Chemistry, Clarkson College of Technology, Potsdam, New York 13676 USA |
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| Abstract: | The methods of preparation of basic ferric sulfate sols consisting of particles uniform in shape of extremely narrow size distribution are described in detail. To produce such sols, acidic solutions containing ferric ions and sulfate ions were aged at elevated temperatures for a few hours. Solids formed from solutions containing a mixture of a ferric salt with a metal sulfate consisted of Fe3(SO4)2(OH)5· 2H2O, which is the basic formulation for the alunite mineral group, whereas particles formed from ferric sulfate solutions also included Fe4(SO4)-(OH)10 in varying proportions. The morphology of the particles was strongly dependent on the Fe3+]: SO42−] ratio in solution. Changes in the cation (K+, NH4+, Na+) of the sulfate salt used in the mixture with ferric nitrate solutions greatly affected the particle size and also exhibited some effect on the lattice parameters. Certain cations (Mg2+, Ni2+, Cu2+) completely inhibited particle formation. During the first few hours of growth of the Fe3(SO4)2-(OH)5· 2H20 particles their diameters increased essentially linearly with time, indicating that the rate determining step was the surface reaction. The relevance of these systems to the study of corrosion of iron and steel is discussed. |
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