1070-4272/04/7703-0471C2004 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 77, No. 3, 2004, pp. 471! 475. Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 3,
2004, pp. 478! 482.
Original Russian Text Copyright + 2004 by N. Yurkshtovich, Golub, Kaputskii, T. Yurkshtovich, Kosterova.
AND POLYMERIC MATERIALS
Complexation of Chromium, Aluminum, and Iron Ions
with Monocarboxy Cellulose
N. K. Yurkshtovich, N. V. Golub, F. N. Kaputskii,
T. L. Yurkshtovich, and R. I. Kosterova
Research Institute of Physicochemical Problems, Belarussian State University, Minsk, Belarus
Received November 28, 2003
Abstract-Complexation of iron(III), aluminum(III), and chromium(III) cations with monocarboxy cellulose
was studied by potentiometric titration and IR spectroscopy. The composition and stability constants of
the complexes were determined.
Monocarboxy cellulose is used as a suture material
in surgery and as a sorbent of heavy metals. There-
fore, the study of reactions of metal ions with func-
tional groups of monocarboxy cellulose and determi-
nation of factors affecting the metal sorption on
monocarboxy cellulose are of both scientific and
Cellulose containing hydroxy and carboxy groups
is prepared by oxidation with nitrogen(IV) oxide.
Oxidized cellulose selectively sorbs some multi-
charged metal cations which behave as cross-linkers
In this work we studied complexation of Al
, and Fe
with monocarboxy cellulose (MCC).
No data are available on the stability of complexes
of these metals with functional groups of MCC.
The mechanism of sorption of the multicharged
cations on MCC was studied by potentiometric titra-
tion in the presence and in the absence of the metal
and by IR spectroscopy.
We used oxidized viscose cord threads (184 tex)
and cotton threads (100 tex) containing from 0.4 to
1.4 mmol g
of carboxy groups in the H form. The
threads were prepared by treatment with 5 or 10%
solutions of nitrogen(IV) oxide in tetrachloromethane
for 7 h . Some physicochemical properties of the
samples are summarized in Table 1.
The procedure for calculating the stability constants
and the experimental procedure are described in [4, 5].
The MCC samples were titrated under static condi-
tions. The ionic strength was kept constant (0.5) by
and NaCl to the solutions of metal
sulfates and metal chlorides, respectively. The total
solution volume was 40 ml; the sample weight was
0.3 g. After the equilibrium was attained (24 h), pH of
the solution and the metal concentration in the sorbent
To analyze the cellulose samples for Al
, they were dissolved in H
. The content of these metals in the
resulting solution was determined, respectively, by
complexometric titration with Dithizone indicator,
chromatometric titration, and colorimetry in the pres-
ence of sulfosalicylic acid .
The procedure for preparing KBr pellets of cellu-
lose samples was described in . The IR spectra
were recorded on a Specord 75-IR spectrophotometer.
The OH bands in the range 300033700 cm
characterized by the following parameters: n
frequency of the absorption maximum; a/b, symmetry
index equal to the ratio of the right (a) and the left
(b) parts of the band at the half-maximum [8, 9].
Table 1. Ion-exchange properties of MCC samples at
I = 0.5
= 0.17 M ³ c
= 0.5 M ³
water, ml g
0.8 ³ 3.5 ³ 0.85 ³ 3.0 ³ 1.10 ³ 0.73
1.4 ³ 3.5 ³ 0.85 ³ 3.0 ³ 1.05 ³ 0.95