1070-4272/04/7710-1679 C 2004 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 77, No. 10, 2004, pp. 1679!1684. Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 10, 2004,
Original Russian Text Copyright + 2004 by Ergozhin, Chalov, Kovrigina, Iskakova, Nikitina.
AND POLYMERIC MATERIALS
Complexation of Anion Exchangers Based on
Polyimines and Allyl and Epoxy Compounds
with Transition Metal Cations
E. E. Ergozhin, T. K. Chalov, T. V. Kovrigina,
R. A. Iskakova, and A. I. Nikitina
Bekturov Institute of Chemical Sciences, Education and Science Ministry of Kazakhstan Republic,
Received June 15, 2004
Abstract-Complexation of polymeric anion exchangers with transition metals was studied by polarographic
and potentiometric titration techniques.
The wide use of ion-exchange sorption for recover-
ing metals from process solutions and for solving var-
ious environmental problems stimulates studies of
complexation of ion exchangers with metals. In choos-
ing a sorbent suitable for efficient separation of metals
with similar properties, data on the stability constants
of sorbent3metal complexes, their composition, and
factors influencing the complexation are required.
These data are also taken into account in synthesis of
sorbents selective for individual metal ions .
It is known that coordination compounds are main-
ly formed by transfer of an unshared electron pair
from a ligand to a vacant orbital of a metal cation .
Sorbents containing amino groups (aliphatic or aro-
matic) are bound to metal ions via nitrogen atoms.
Polymeric sorbents containing closely located amino
groups can be coordinated to metals to give of strong
five-membered chelate rings.
In this study, the complexation of polymeric poly-
functional anion exchangers with transition metal
cations was examined by polarographic and potenti-
ometric titration techniques. Anion exchangers were
prepared by condensation of allyl glycidyl ether
(AGE) with polyethylenimine (PEI) [AGE3PEI], AGE
with poly(2-methyl-5-vinylpyridine) (PMVP) [AGE3
PMVP], 4,4-isopropylidenediphenoldiglycidyl ether
(ED-20) with PEI [ED-203PEI], ED-20 with PVMP
[ED-203PVMP] and allyl haloides with PEI and
The polymeric anion exchangers used in this study
were prepared by the methods reported in [3, 4]. A por-
tion of the reaction mixture was taken in the precon-
densation stage and treated with diethyl ether to pre-
cipitate the polymeric sorbent. This sorbent was dried,
and its solutions suitable for polarographic studies of
its complexation with transition metals were prepared.
The remaining reaction mixture was cured at 80oCto
obtain an insoluble soild anion exchanger. The com-
plexation of the cured sorbent with transition metals
was studied by potentiometric titration.
The complexation of the anion exchangers obtained
in the precondensation stage with transition metals
was studied polarographically in 25% aqueous di-
methylformamide (DMF) containing 0.01 N H
The anion exchanger concentration in these solutions
was varied from 0.1 to 20 g l
. The concentration
of transition metal salt (CoSO
) in these solutions was 2 0 10
M. A saturated
calomel electrode was used as a reference electrode.
The dropping mercury cathode had the following
= 4.28 mg
. The electro-
lytic cell was kept at 25 + 0.1oC. The solutions used
were deoxygenized by bubbling of argon for 10 min.