Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 10, pp. 1785−1793.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
E.V. Datskevich, R.V. Prikhod’ko, I.V. Stolyarova, A.V. Lozovskii, V.V. Goncharuk, 2010, published in Zhurnal Prikladnoi Khimii,
2010, Vol. 83, No. 10, pp. 1646−1654.
OF SYSTEMS AND PROCESSES
Water Treatment to Remove Аcid and Basic Dyes
by Biosorption on Polysaccharide Composites
E. V. Datskevich, R. V. Prikhod’ko, I. V. Stolyarova, A. V. Lozovskii, and V. V. Goncharuk
Dumanskii Institute of Colloid and Water Chemistry, National Academy of Sciences of Ukraine, Kiev, Ukraine
Received March 10, 2010
Abstract—A composite material based on cross-linked cationic starch and sodium alginate was synthesized
and studied. The composite is an effective biosorbent for removing various types of synthetic dyes from water.
The inﬂ uence exerted on adsorption of a basic dye (Methylene Blue) and an acid dye (Methyl Orange) by
temperature, pH, solution ionic strength, and biosorbent amount was examined, and the dye adsorption kinetics
was studied. The adsorption isotherms were analyzed using various models of sorption equilibrium.
One of the most important problems today is
protection of the environment and creation of optimal
conditions for its improvement. Any chemical pollutants
are foreign components of an ecosystem, and their
impact can exceed the adaptive possibilities of living
organisms, developed in the course of evolution .
Synthetic dyes, even at their low content in the
hydrosphere, are ecotoxicants exerting a strong negative
effect on the environment [2, 3]. Furthermore, the
majority of dyes are very stable compounds. Therefore,
today adsorption is considered to be the best method
for water treatment to remove such toxicants. In many
cases, without using adsorption it is impossible to fulﬁ ll
sanitary requirements concerning preservation of purity
of water bodies or technical speciﬁ cations for the quality
of water used in closed-loop production processes.
Various artiﬁ cial and natural porous materials having
developed or substance-speciﬁ c surface are used as
sorbents [4, 5]. The most effective sorbents are activated
charcoals, but their use is not always economically
justiﬁ ed because of their high cost and problems with
regeneration. Therefore, expansion of the range of raw
materials for preparing effective sorbents becomes an
urgent problem, and one of the ways of its solution is
the use of cheap and available natural polymers as raw
Numerous papers have been published recently on the
development of biosorbents containing polysaccharides
[6–9], because these materials are often considerably
more selective than ion-exchange resins and activated
charcoals and can remove dyes from water to a very low
The goal of this study was to prepare biosorbents
based on polysaccharides that widely occur in the
nature, starch and sodium alginate, and to evaluate the
sorption properties of these materials.
Starch in its chemical composition is a mixture of
two homopolysaccharides, linear amylose and branched
amylopectin. Materials for diverse purposes ,
including effective adsorbents for water treatment, were
prepared from starch and its derivatives. As follows
from analysis of the literature, today the interest in the
development of new sorbents using starch as the raw
material appreciably grows.
Sodium alginate is an anion-active biopolymer
consisting of two monomers, residues of D-mannuronic
and L-guluronic acids in various proportions. When
dissolved in water, it readily forms a gel, which
determines its use as a thickener, binder, and stabilizer;
the linear alginate chains are usually cross-linked with
ions. Today brown algae are the only commercial
source of sodium alginate, but nevertheless alginates are