Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 3, pp. 562−568.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
A.M. Kudratov, Z.S. Salimov, 2010, published in Khimicheskaya Promyshlennost’, 2010, Vol. 87, No. 1, pp. 16−22.
TECHNOLOGY OF ORGANIC
AND INORGANIC CHEMISTRY
The Elaboration of Technology of Preparation
of Adsorption Ion Exchange Materials
in the Basis of Rice Waste
A. M. Kudratov and Z. S. Salimov
The Institute of General and Inorganic Chemistry, National Academy of Sciences, Uzbekistan
Received November 19, 2009
Abstract—The results of investigations of agricultural waste (rice husk) processing are presented. The kinetics
of processing of cellulose and cation-exchange material, having high exchange capacity is determined, and the
technology of its production is proposed. The inﬂ uence of the temperature, esteriﬁ cation time, and the volume of
phosphorus acid on exchange capacities of produced sorption materials are determined.
The problem of the utilization of agricultural waste
and production of new valuable materials on its basis
for various industries and ﬁ nding solution for ecological
issues in the same time are quite urgent.
It is known that the manufacturing different adsorption
ion-exchange materials and especially synthetic materials
is connected with solving the problem of monomers
production, implementation of polymerization and
polycondensation reactions . Alongside the synthesis of
new adsorption ion-exchange materials, a lot of attention
in literature is paid to a study of physicochemical features
and the use of substances of organic and plant origin as
sorbents. At the same time the study of their chemical
and morphological structures [2–3] presents a special
interest. Works devoted to study of sorption features of
phosphorus acids cationites relative to heavy metals and
[4–6] are known. The attention is paid
to the features of bonds and afﬁ nity between sorbed ion
and functional groups of the ionite.
In previous investigations we studied the technology
of preparation and application of adsorbents on the
basis of plant raw material (grained cellulose cationites
on the basis of shells of apricot, almond, walnut,
sawdust, rice straw) with high exchange capacity for
water cleaning from radioactive elements and heavy
metals, and physicochemical features of obtained ion-
exchangers were examined . It is determined that the
efﬁ ciency extent of new adsorbents for water cleaning
from radioactive elements, mainly uranium, run up
to 98.4–98.9%, with initial uranium content in water
1700 μg l
; the extent of cleaning from heavy metals
reaches 98.5; 77.6; 60% from Mo, Cd, Hg respectively
with initial content of metal ions in water 0.420, 0.021,
0.000088 mg l
respectively. Ion-exchange materials on
the basis of plant substances and inorganic sorbents are
applied to separation of mineral oil from sewage due to
high adsorption coefﬁ cient . The mathematic model
of optimization of esteriﬁ cation process of cellulose
materials with the purpose of obtaining of effective
ionites on the basis of rice husk is also elaborated .
Cellulose is a high molecular polysaccharide with
linear structure in the form of polyanhydro-β-D-glucose.
Due to intermolecular bonds rigid structures form
providing a high mechanical resistance of plant tissues.
Macromolecule of cellulose is the component of several
crystalline parts in morphological structure of polymer.
Cationites in the form of phosphate ethers of cellulose
(PEC)  on the basis of sawdust, shells of almond,
walnut, dried apricot, rice straw and bulrush stem can
be included into the composition of modiﬁ ed anion-
exchange cyclic polymer net . Earlier the obtained
polyampholite ionite on the PEC and PAN basis in
different ratio  was widely investigated by us.
In this work results of investigations of elaboration of