ISSN 1070-4272, Russian Journal of Applied Chemistry, 2017, Vol. 90, No. 3, pp. 393−400. © Pleiades Publishing, Ltd., 2017.
Original Russian Text © A.F. Seliverstov, Yu.O. Lagunova, S.A. Kulyukhin, B.G. Ershov, 2017, published in Zhurnal Prikladnoi Khimii, 2017, Vol. 90, No. 3,
AND ION EXCHANGE PROCESSE
Sorption of Arsenic onto Inorganic Sorbents Modiﬁ ed
with Iron Compounds
A. F. Seliverstov*, Yu. O. Lagunova, S. A. Kulyukhin, and B. G. Ershov
Frumkin Institute of Physical Chemistry and Electrochemistry, Leninskii pr. 31, k. 4, Moscow, 119071 Russia
Received November 25, 2016
Abstract—Granulated inorganic sorbents based on silica gel of KSKG grade and aluminum oxide and modiﬁ ed
with Fe(III) compounds were developed for water treatment to remove As(V). The inﬂ uence of the particle size
of the modifying additive on the ability of silica gel to take up As(V) was examined. The KSKG-based sorbents
modiﬁ ed with nanoparticles of Fe(III) compounds exhibit the highest sorption capacity. The capacity of silica gel
based sorbents modiﬁ ed with nanoparticles of iron compounds for As(V) is higher than that of analogous sorbents
modiﬁ ed with iron oxides prepared by thermal decomposition of Fe(III) nitrate.
Numerous methods for water treatment to remove
arsenic are known. These include chemical coagulation,
adsorption, nanoﬁ ltration, reverse osmosis, ion
exchange, electrodialysis, etc. .
The majority of the existing methods for water
treatment to remove arsenic are expensive, which
reduces their competitiveness. Only modern reverse
osmosis systems using membranes with very small pore
size ensure exhaustive puriﬁ cation. These systems are
complex and expensive . Therefore, the development
of an efﬁ cient method for arsenic removal from aqueous
media remains a topical problem.
Sorption methods with different types of sorbents
are widely used for water treatment to remove arsenic.
Inorganic sorbents exhibit high levels of selectivity to
arsenic, chemical durability, and heat resistance, but
their use is restricted by process parameters of these
materials. When choosing a sorbent it is necessary to
take into account not only its chemical durability and
mechanical strength, but also simplicity of preparation
and availability of the starting chemicals. Therefore,
increasing researchers’ attention has been paid recently
to sorbents modiﬁ ed with iron compounds [2–10].
However, despite publication of numerous papers, the
inﬂ uence of the particle size of modifying additives on
the sorption capacity of the sorbents for arsenic remains
This study was aimed at determining how the ability
of sorbents based on silica gel and aluminum oxide
and modiﬁ ed with Fe(III) compounds to take up As(V)
depends on the synthesis procedure.
We used sorbents based on silica gel of KSKG grade
[GOST (State Standard) 3956–76] with the granule
size of 0.1–0.3 cm and on Al
Speciﬁ cation) 2163-004-81279872–01] in the form of
spheres 0.3–0.8 cm in diameter.
All the salts and acids used in the study were of
chemically pure grade.
The precursors of sorbents based on Al
were prepared by impregnation with an aqueous solution
of Fe(III) nitrate, followed by drying at 150°С in air.
Two synthesis procedures were used: (1) treatment
of the precursors with 2 M aqueous ammonia, keeping
for 5–10 h, and drying in air at various temperatures;
(2) heating in air for 5 h at 600°С. Sorbents based on
are spherical particles of regular shape, whereas