Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 1, pp. 166−168.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
E.V. Belik, A.V. Brykalov, F.A. Bostanova, E.M. Golovkina, 2009, published in Zhurnal Prikladnoi Khimii, 2009, Vol. 82, No. 1,
Study of Acidity of the Modiﬁ ed Alumosilicate Sorbents
Prepared by the Method of Destructive
E. V. Belik, A. V. Brykalov, F. A. Bostanova and E. M. Golovkina
Stavropol’ State Agrarian University, Stavropol, Russia
Received November 27, 2007
Abstract—Acid properties of the surface of copper-, cobalt- and iron-containing alumosilicate sorbents prepared
by the method of destructive epitaxial precipitation we investigated. Concentration and strength of the proton
acid centers of the samples is studied in comparison with the parent natural alumosilicate sorbent based on the
opokas of the Prikaspii lowland of Astrakhan’ region.
The directions of development of the modern material
science are connected with the elaboration of technology
for the preparation of solid state catalysts and effective
sorbents . It is known that adsorption properties of
solid substances including silicate and alumosilicate
sorbents are essentially deﬁ ned by the acid properties
of their surfaces [1, 2]. Mixed oxides, in particular,
alumosilicates possess stronger surface acid properties
than isolated oxides .
It has been shown  earlier that silochrom C-120
containing on its surface titanium oxide monolayers
prepared by the method of molecular layer deposition
possesses stronger acid properties that the parent siliceous
Now a direction is actively developed connected with
the application of sorption puriﬁ cation of water from
various sources and applications from toxic compounds
like phenols, pesticides, heavy metals and surfactants.
Traditionally for this purpose was used active carbon.
However, features of their structure restrict their applica-
tion to the puriﬁ cation of sewages and natural water from
the organic compounds present together with the micellar
components (surfactants, humus-like substances) .
Use of active carbon in the system of industrial water
treatment is acceptable economically only at multiple
regeneration, which is quite expensive.
The natural alumosilicate sorbents that are cheap
enough are promising for the application to the industrial
water treatment due to their high absorprion activity
toward toxic substances, and they are effective at the
water puriﬁ cation from the micellar components .
Therefore it is actual to search for effective sorbents
providing puriﬁ cation of sewages from the toxicants of
The proton-donor ability of alumosilicate sorbents
prepared by the method of destructive epitaxial
precipitation  was investigated in this work.
The Brønstedt acid centers were studied on the
samples of alumosilicates based on the opokas of
Prikaspii lowland of the Astrakhan’ region with the
following chemical composition (wt %): SiO
4.2. These natural sorbents contain inclusions of iron,
magnesium and calcium oxides . Speciﬁ c surface of
the alumosilicate sorbents was 730 m
, pores volume
, fraction size 0.2–0.5 mm. The speciﬁ c surface
of the sorbents was measured by the method based on
low temperature nitrogen sorption , pores volume by
the method of mercury intrusion porosimetry . For
the chemical modiﬁ cation of the alumosilicate samples
surface was used the method of destructive epitaxial
For the elucidation of the Brønstedt acid centers
on the modified composite sorbent was applied