Comparison of the sorption properties of crystalline and amorphous samarium(III) oxohydroxides

Autor:	L. F. Kuz'mich, S. I. Matveenko, S. I. Pechenyuk, E. V. Kalinkina
Rok vydání:	1998
Předmět:	Samarium Hydrolysis chemistry Precipitation (chemistry) Inorganic chemistry Ionic bonding chemistry.chemical_element Sorption Titration General Chemistry Amorphous solid Ion
Zdroj:	Russian Chemical Bulletin. 47:560-565
ISSN:	1573-9171 1066-5285
DOI:	10.1007/bf02495953
Popis:	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.
Databáze:	OpenAIRE
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