Abstract
The influence of the pH of precipitation (pH1) and the ionic medium on the sorption properties of as-precipitated samarium(III) oxohydroxides,i.e., the pH of zero charge point and the rate of heterogeneous hydrolysis of the IrCl6 2−, RhCl6 3−, and PtCl4 2− complexes, was studied. The composition of precipitates was studied by the drop titration of solutions of samarium nitrate and thermography. It was found that as-predipitated samarium oxohydroxides are amorphous and the substitution of NO3 − ions by OH− is not complete even at pH1 11. Heterogeneous hydrolysis occurs on the surface of samarium oxohydroxide, and its rate increases with increasing pH1. The as-precipitated samarium oxohydroxides have much higher sorption activities than crystalline Sm2O3, and their activities are similar to those of ferrogels.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 583–588, April, 1998.
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Pechenyuk, S.I., Kuz'mich, L.F., Kalinkina, E.V. et al. Comparison of the sorption properties of crystalline and amorphous samarium(III) oxohydroxides. Russ Chem Bull 47, 560–565 (1998). https://doi.org/10.1007/BF02495953
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DOI: https://doi.org/10.1007/BF02495953