ISSN 1070-4272, Russian Journal of Applied Chemistry, 2008, Vol. 81, No. 10, pp. 1863–1864. © Pleiades Publishing, Ltd., 2008.
Original Russian Text © M.N. Gorbunova, E.A. Sazonova, 2008, published in Zhurnal Prikladnoi Khimii, 2008, Vol. 81, No. 10, pp. 1743–1744.
Sorption Ability of N-Vinylpyrrolidone–Trimethoxyvinylsilane
M. N. Gorbunova and E. A. Sazonova
Institute of Technical Chemistry, Ural Branch, Russian Academy of Sciences, Perm, Russia
Received April 9, 2008
Abstract—Sorption ability of N-vinylpyrrolidone–trimethoxyvinylsilane copolymers was studied. Cross-linked
N-vinylpyrrolidone–trimethoxyvinylsilane copolymers sorb Ni(II) and Cu(II) from ammonia solutions and can
find use for wastewater treatment to remove these metal ions.
Polymeric sorbents of various classes are widely
used in analysis and preconcentration of metals [1, 2].
In particular, cross-linked copolymers based on N-vi-
nylpyrrolidone (VP) are used as sorbents. For example,
VP–divinylbenzene copolymer is used in solid-phase
extraction to determine phenoxyalkanoic acids and
other herbicides in water and in the environment .
The copolymer of VP with 2-(vinyloxyethoxy)meth-
ylthiirane is a sulfur-containing sorbent of Ag(I) and
Hg(II) ions . Sorbents of a 3D structure, used as
stabilizers for food and perfume liquids, were prepared
by copolymerization of VP with triethylene glycol di-
methacrylate [5, 6].
With the aim to prepare new potential sorbents,
we synthesized cross-linked copolymers of N-vinyl-
pyrrolidone with trimethoxyvinylsilane (TMVS) and
examined their sorption activity.
The pH dependence of the sorption ability of
the VP–TMVS copolymer toward nonferrous and
heavy metal ions was determined by the static sorption
method at the initial concentration of the metal ions of
0.005 M, temperature of 20
2°С, polymer : salt
solution ratio of 1 : 200, and phase contact time of 24 h.
Solutions of metal salts were prepared by dissolv-
ing a weighed portion of appropriate salt CuCl
, or Sc(SO
of required concentration or in ammonia solutions.
The metal concentrations in solutions were determined
by complexometric titration with Na
EDTA. The static
sorption capacity for a metal, E
, was determined from
the difference between the metal concentrations in
the solution before and after sorption, with an error not
VP–TMVS copolymers were prepared by radical
The copolymers obtained are colorless solids
soluble in ethanol, acetone, and DMSO. However, af-
ter reprecipitation and drying, the copolymers lose
the solubility in organic solvents because of the forma-
tion of siloxane cross-links, in agreement with pub-
lished data .
We examined the dependence of the sorption abil-
ity of the cross-linked VP (80 mol
%)–TMVS (20 mol
copolymer (content of active groups, according to ele-
mental analysis, 8.64 mmol
) toward certain transi-
N-Vinylpyrrolidone (Lancaster) was dried over
KOH and vacuum-distilled, with collection of the frac-
tion with bp 65°C (1.5 mm Hg), n
Trimethoxyvinylsilane (chemically pure grade)
was purified by vacuum distillation, with collection of
the fraction with bp 123°С, d
= 0.9700, n
Copolymerization of VP with TMVS was per-
formed in the bulk and in solution in a vacuum in
the presence of AIBN initiator.