Complexing of Chromium(III) and Aluminum(III) Cations
with Phosphorus-Containing Cellulose-Based Fibrous Sorbent
N. K. Yurkshtovich
, T. L. Yurkshtovich
, F. N. Kaputskii
, N. V. Golub
and R. I. Kosterova
Institute of General and Inorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus
Research Institute of Physicochemical Problems, Belarus State University, Minsk, Belarus
Received July 30, 2008
Abstract—Sorption of Al
cations from sulfuric acid solutions with a cellulose phosphate-based
fibrous sorbent was examined.
INORGANIC SYNTHESIS AND INDUSTRIAL
ISSN 1070-4272, Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 6, pp. 963–967. © Pleiades Publishing, Ltd., 2009.
Original Russian Text © N.K. Yurkshtovich, T.L. Yurkshtovich, F.N. Kaputskii, N.V. Golub,
R.I. Kosterova, 2009, published in Zhurnal Prikladnoi Khimii,
2009, Vol. 82, No. 6, pp. 908–912.
Modification of cellulose ethers/esters is aimed
primarily at improving their strength characteristics
and increasing the stability in solutions. A possible
way to affect the mechanical and physicochemical
properties of the modified cellulose fibers lies in
adsorption by them of cations (Al
as cross-linkers with respect to the macromolecule.
Such treatment of these sorbents is more efficient than
grafting side chains to the polysaccharide macro-
This study concerns sorption of the Al
cations with low-substituted cellulose phosphate (CP).
It is biocompatible with human body tissues, capable
of biodegradation, and suitable as a sorbent of
medicinal substances and resolving surgical suture
thread material. The relationships in sorption of single-,
double-, and triple-charged metal cations with high-
substituted cellulose phosphate were described in
[2, 3], where a quantitative model of the sorption
process was presented. The structure of complexes
involving some double- and triple-charged cations and
cellulose phosphate was discussed earlier [3, 4], but
still remains to be convincingly established.
Here, we examined sorption of aluminum(III) and
chromium(III) from sulfuric acid solutions with
cellulose phosphate fibers and determined the
composition and structure of the complexes formed by
the metals with the sorbent acting as polymeric ligand.
Phosphoric acid esters of cellulose based on
modified rayon (“Khimvolokno” Production Associa-
tion, Svetlogorsk) and cotton (Groniteks Joint-Stock
Company, Grodno) fibers were prepared by the
procedure described in . For esterification of the
cellulose fibers served an aqueous solution of
orthophosphoric acid (chemically pure grade) and
carbamide (pure grade) with the concentration of 0.5
and 3.33 M, respectively. The liquor ratio was 10 ml g
The cellulose phosphate samples were identified
from the content of phosphorus  and nitrogen 
and based on the results of potentiometric titration with
0.05 M NaOH against the background of 0.05 M NaCl.
Table 1 lists the main characteristics of the samples
Sorption of Al
cations with the cellulose
phosphate samples from 0.01–0.20 M solutions of their
sulfuric acid salts was carried out under static
conditions for 24 h at 298 K and the liquor ratio of
100 ml g
. To adjust pH of the solution of the metal
salts we added the necessary amount of barium
hydroxide which reacts with sulfuric acid to form
virtually insoluble barium sulfate. The degree of
swelling was determined gravimetrically .
The CP samples containing metal cations were
washed with water and dried in a vacuum desiccator
above phosphorus(V) oxide at 323 K under residual