Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 7, pp. 1059−1063.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © I.M. Lipatova, E.A. Mezina, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85, No. 7, pp. 1090−1094.
OF SYSTEMS AND PROCESSES
Synthesis of Chitosan-Mineral Sorbents on Fibrous
Supports and Study of Their Properties
I. M. Lipatova and E. A. Mezina
Krestov Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, Russia
Received May 12, 2012
Abstract—Mechanoacoustic method was used to obtain ultraﬁ ne suspensions based on chitosan solutions and
inorganic ﬁ llers. The rheological properties of the resulting suspensions, their ﬁ nishing capacity for linen materi-
als, and sorption capacity for copper ions of the ﬁ brous sorbents obtained were examined.
A particular place among organic sorbents widely
used in various ﬁ elds is occupied by the natural polymer
chitosan. Macromolecules of this polysaccharide contain
several functional groups: hydroxy, carbonyl, amino,
and acetylamide groups and oxygen bridges. Therefore,
chitosan sorbents can absorb a surprisingly wide variety
of compounds. The nontoxicity of chitosan makes rather
promising its use in development of sorbents intended
for solution of ecological and biomedical problems.
Thanks to its chelate-forming capacity, chitosan is the
most efﬁ cient in recovery of heavy metal ions from
water, drinks, and biological ﬂ uids. Of possible practical
interest are composite sorbents based on chitosan and
ﬁ nely dispersed mineral ﬁ llers . If chitosan is the
target sorbent, the ﬁ ller plays a secondary role as an
agent controlling the sorption properties of the polymeric
The most widely used granulated and coarsely
grained sorbents require a prolonged contact with a ﬂ uid
being puriﬁ ed because of their unsatisfactory kinetic
characteristics failing to provide the required degree of
puriﬁ cation at high ﬁ ltration rates. Powdered sorbents
show better sorption kinetics, but create a substantial
hydrodynamic resistance. One of ways to solve the
problem of combining a high sorption rate with good
hydrodynamic properties of a sorbent is to deposit it
onto a ﬁ brous material .
The goal of our study was to produce organo-
inorganic hybrid materials based on chitosan by the
mechanoacoustic method and to examine the effect of
dispersed ﬁ llers on the sorption capacity of chitosan for
As objects of study served industrial chitosan
with MM 120 000 and a 0.78 degree of deacetylation
(Bioprogress ZAO, Shchelkovo). Chitosan-mineral
suspensions were prepared by introduction of weighed
portions of powdered ﬁ llers into 2% solutions of
chitosan in 2% acetic acid.
The suspensions were homogenized in a laboratory
rotary-pulsatory apparatus (RPA) in the recycling mode.
The average gap between the rotating and immobile
members of the working chamber was 0.3 mm. The
rotor rotation speed was 5000 rpm, which corresponds
to a shear rate gradient of 17.4 × 10
. The treatment
duration was 10 s.
The dynamic viscosity of the chitosan-based
suspensions was determined in a RHEOTEST-2
rotational viscometer with a “cylinder-in-cylinder”
working unit at 25 ± 0.5°C at shear rates of (0.2–1.3) ×