Conclusions
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1.
The process for the polymerization of metal aquo-ions in mixed aqueous solutions of Fe and Al salts can be subdivided into the following steps: formation of particles of iron hydroxide sol, formation of monomeric and dimeric polynuclear aluminum hydroxo complexes, and formation of particles of aluminum hydroxide sol.
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2.
The aluminum aquo-ions do not participate in forming the particles of the iron hydroxide sol.
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3.
The aluminum aqua and hydroxo complexes stabilize the particles of the iron sol and facilitate a retention of their composition and properties clear up to the deposition of a precipitate.
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4.
The particles of the iron and aluminum sols are formed independently during polymerization.
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Literature cited
J. W. Akitt, N. N. Greenwood, B. L. Khandelwall, and G. D. Lester, J. Chem. Soc. Dalton Trans., 604 (1972).
L. N. Mulay and P. W. Selwood, J. Am. Chem. Soc.,76, 6207 (1954).
L. N. Mulay and M. C. Naylor, Advances in Chemistry of Coordination Compounds, MacMillan, New York (1961), p. 520.
M. A. Fedotov, O. P. Krivoruchko, R. A. Buyanov, and B. P. Zolotovskii, Izv. Akad. Nauk SSSR, Ser. Khim., 1705 (1975).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 473–475, February, 1977.
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Fedotov, M.A., Krivoruchko, O.P., Golovin, A.V. et al. Characteristics of hydrolytic polymerization of metal aquo-ions in mixed aqueous solutions of Fe(III)-Al(III) salts. Russ Chem Bull 26, 428–430 (1977). https://doi.org/10.1007/BF00921879
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DOI: https://doi.org/10.1007/BF00921879