1070-4272/04/7702-0205 C 2004 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 77, No. 2, 2004, pp. 205!208. Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 2, 2004,
Original Russian Text Copyright + 2004 by Sych, Kartel’, Strelko, Denisovich, Zaitsev.
AND ION-EXCHANGE PROCESSES
Composite Sorbing Materials
Based on Porous Carbon Powders
N. V. Sych, N. T. Kartel’, V. V. Strelko, V. A. Denisovich, and Yu. P. Zaitsev
Institute of Sorption and Endoecology Problems, National Academy of Sciences of Ukraine, Kiev, Ukraine
Received May 5, 2003
Abstract-The possibility of synthesizing composite sorbing materials on the basis of porous carbon powders
was studied. The sorption and porosimetric characteristics of the composites were examined.
The rapid development of sorption technologies
imposes increasingly stringent requirements upon the
properties of sorbents: adsorption selectivity, physi-
cochemical and physicomechanical characteristics.
The acute need for widely diverse and highly efficient
adsorbents becomes particularly pressing in connec-
tion with the problems of purification, concentration,
separation, and accumulation of technological gases
in modern high-output processes. The possibilities of
varying widely the required sorbent properties are
opened up by the creation of the so-called composite
sorbing materials (CSM) on the basis of highly porous
carbon powders with addition of a binder .
By distributing and binding monodisperse powders
in a certain way, in conformity with the closest-pack-
ing law, one can obtain sorbing carbon materials with
high specific pore volume of ~0.5 cm
row distribution of this volume over equivalent radii
Creating mixed sorbents on the basis of finely
ground porous powders, formed as by-products at
plants that manufacture activated carbon, and ultra-
dispersed additives makes it possible to obtain novel
CSM, which contain particles with narrow size distri-
bution, a kind of [binder,] in spaces between packed
particles of activated carbon (see scheme).
Depending on the CSM preparation conditions,
the pores of the carbon powder are 30370%-filled
with this ultradispersed component, which determines
the volume and radius of mesopores .
In order to develop this concept further, the pos-
sibility of obtaining carbon sorbents with high po-
rosimetric characteristics and strength from half-prod-
ucts to be utilized and wastes formed in manufacture
of activated carbon was studied. An attempt was made
to develop technological foundations for synthesis of
microporous CSM from porous carbon (activated and
oxidized anthracite, activated salted carbon) and ul-
tradispersed powders (technical-grade carbon3carbon
black, activated carbon fiber). The choice of just these
combinations is based on the authors’ opinion that
coal must improve the strength characteristics of the
resulting formed material, and the ultradispersed pow-
der additives introduced must contribute significantly
to the development of porosity.
Table 1 lists characteristics of the starting compo-
nents used to obtain formulations. The stock for syn-
thesizing composite sorbing materials was prepared
by mixing the main components with a binder in cer-
tain mass ratios and then subjected to forming.