ISSN 1070-4272, Russian Journal of Applied Chemistry, 2007, Vol. 80, No. 7, pp. 1055!1057. + Pleiades Publishing, Ltd., 2007.
Original Russian Text + N.S. Shaglaeva, S.V. Amosova, R.G. Sultangareev, L.M. Stanevich, E.F. Voropaeva, 2007, published in Zhurnal Prikladnoi
Khimii, 2007, Vol. 80, No. 7, pp. 1086!1088.
AND ION-EXCHANGE PROCESSES
Gold(III) Sorption with Copolymers Derived
from Divinyl Sulfide
N. S. Shaglaeva, S. V. Amosova, R. G. Sultangareev,
L. M. Stanevich, and E. F. Voropaeva
Favorskii Irkutsk Institute of Chemistry, Siberian Division, Russian Academy of Sciences, Irkutsk, Russia
Irkutsk State Technical University, Irkutsk, Russia
Irkutsk State Medical University, Irkutsk, Russia
Received June 27, 2006; in final form, February 2007
Abstract-Sorption recovery of gold(III) from aqueous mineral acids with copolymers of 4-vinylpyridine and
2-methyl-5-vinylpyridine with divinyl sulfide was studied.
Preconcentration of trace amounts of precious
metals in analysis of natural and industrial objects and
recovery of these elements from hydrometallurgical
waste with ion-exchange resins find growing use.
The corresponding ion-exchange resins should have
high sorption capacity and distribution coefficients
[1, 2]. Previously [3, 4] we developed methods for
preparing network copolymers of divinyl sulfide
(DVS) with 4-vinylpyridine (VP) and 2-methyl-5-vin-
ylpyridine (MVP) and examined the physicochemical
properties of these macromolecular compounds.
In this study, we examined the sorption activity of
copolymers of divinyl sulfide with vinylpyridines
with respect to gold(III).
Divinyl sulfide was separated from the stabilizer by
distillation (bp 83384oC/720 mm Hg). 4-Vinylpyrid-
ine and 2-methyl-5-vinylpyridine, which are commer-
cial monomers, were purified by repeated distillation
in a vacuum. Their purity was monitored chromato-
Radical copolymerization of DVS with VP or MVP
was performed in dimethylformamide (DMF) by an
ampule method in the presence of azobis(isobutyroni-
trile) (AIBN) at 60oC under argon. The copolymers
were washed with solvents (benzene, acetone, water)
and dried to constant weight in a vacuum. The copoly-
mer composition was calculated from the data of
elemental analysis, which was performed on a Thermo
Finnigan gas analyzer. The IR spectra of compounds
in KBr pellets and mineral oil were recorded on
an IFS-25 spectrometer.
The reference Au(III) solution was prepared by dis-
solution of H[AuCl
] in water and standardized by
the standard procedure . The working solutions
were prepared by dilution of the initial solutions just
before experiments. The sorption ability of the co-
polymers with respect to gold(III) chloro complexes
was studied in the static mode at room temperature as
follows: 10 mg of a copolymer was introduced into
a beaker, the required acidity of the solution was
adjusted, and a definite amount of an Au(III) solution
was added. The metal sorption was performed from
20 ml of solution in the static mode with vigorous
stirring. After a definite time, the copolymer was
filtered off. The Au(III) content was determined by
atomic absorption spectroscopy.
The radical copolymerization of DVP with VP
gives insoluble products in any case. In the DVS3
MVP system, copolymerization in the presence of
AIBN gives an insoluble copolymer only at a low
content of the sulfur-containing monomer (<5 mol %).
The maximal sulfur content of the sample is 1.2 wt %
(Table 1). At a further increase in the DVS content
of the initial mixture, soluble reaction products are
formed. The yield of the copolymer decreases with
increasing DVS content. The scheme of formation of
network copolymers is shown below: