Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 8, pp. 1157−1162.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © E.A. Datkova, L.M. Dimova, G.V. Ratovskii, O.V. Tyukalova, L.N. Belonogova, G.I. Smirnov, 2012, published in Zhurnal Prikladnoi
Khimii, 2012, Vol. 85, No. 8, pp. 1213−1219.
AND INDUSTRIAL INORGANIC CHEMISTRY
Study of Ion-Exchange Properties of Tin(IV) Phosphate
Modiﬁ ed with Sodium Hexanitrocobaltate
E. A. Datkova, L. M. Dimova, G. V. Ratovskii, O. V. Tyukalova,
L. N. Belonogova, and G. I. Smirnov
Irkutsk State University, Irkutsk, Russia
Received January 24, 2011
Abstract—The interrelation between the chemical composition, structure, and ion-exchange properties of tin(IV)
phosphate modiﬁ ed with sodium hexanitrocobaltate was studied. The sorption capacity was increased; the pos-
sibilities for lithium, rubidium, and cesium sorption were extended owing to change in the size of cavities in the
Inorganic sorbents are widely used in various ﬁ elds
of experimental research and industrial practice, because
organic ion exchangers cannot be applied under condi-
tions of strong X-ray radiation, at high temperatures, and
for the separation of elements with similar properties.
Recently, attention is paid to their modiﬁ cation [1–7].
Tin(IV) phosphate is the least known compound whose
properties can be changed in the presence of various
modiﬁ ers, sodium hexanitrocobaltate in particular. This
modiﬁ er is used in analytical practice for quantitative
determination of potassium and was therefore chosen for
increasing sorption capacity with respect to potassium
cations. Structure and ion-exchange properties of these
compounds have hardly been studied.
In the study, the structural features of tin(IV) hy-
O modiﬁ ed with sodium
hexanitrocobaltate were determined, depending on the
conditions of the synthesis and sorption ability with
respect to elements with similar properties.
Tin(IV) phosphate was synthesized by direct deposi-
tion or high-temperature boiling upon the interaction of
tin(IV) chloride with orthophosphoric acid at a certain
P/Sn ratio [8, 9]. Sodium hexanitrocobaltate introduced
during the synthesis was used as modiﬁ er. The modiﬁ er:
tin molar ratio was varied in the range 0.25–1.0. The re-
sulting samples were washed to pH 3 till no cobalt ions
in the wash water was present, which was conﬁ rmed by
the atomic absorption method. The study was carried
out in accordance with the procedure described in .
The X-ray diffraction patterns of the synthesized
tin(IV) phosphate samples (powders) before and after the
modiﬁ cation were recorded on a DRON-3M diffractom-
eter in Сu
radiation and identiﬁ ed using PDF data card
. IR spectra of samples (suspensions in evacuated
vaseline oil) were obtained on a Specord M-80 spectrom-
eter in the region 4000–400 cm
analysis was performed on an STA-449 Jupiter simultane-
ous thermal analyzer equipped with a QMS-403C-Aiolus
quadrupole mass spectrometer in inert atmosphere. Ion
exchanger for physicochemical study was in minimal
contact with water upon preparation and storage.
Acid-base properties were studied by potentiometric
titration of successive weighed portions. The content of
alkali metals in aqueous solutions was determined by the
atomic absorption method (Spectrum-5 spectrometer) in
the emission mode in a propane–air ﬂ ame. The relative
standard deviation was 0.01–0.02. The sorption charac-
teristics were calculated in accordance with the data of