Sorption Properties of Natural Sorbent Silica Clay
in Relation to Nickel Cations
E. S. Klimov, E. N. Kalyukova, and M. V. Buzaeva
Ul’yanovsk State Technical University, Ul’yanovsk, Russia
Received December 30, 2009
Abstract—Sorption of nickel cations on natural sorbent silica clay was studied. The sorption isotherms were
constructed and the quantitative characteristics of the process of sorption on a sorbent were determined.
ISSN 1070-4272, Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 6, pp. 1080–1082. © Pleiades Publishing, Ltd., 2010.
Original Russian Text © E.S. Klimov, E.N. Kalyukova, M.V. Buzaeva, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83, No. 6, pp. 1026–1028.
Sorption purification is one of the most efficient
methods, which are successfully used for decontamina-
tion of natural and wastewaters, advantageous over
other physicochemical methods, and is economically
and technologically reasonable for the development of
close water circulating systems at industrial plants. The
main practical task of wastewater purification is choice
of a natural sorbent, which combines low cost with a
sufficient purification degree.
One of the natural sorbents are silica clays,
sedimentary silicas with mesoporous structure (about
50% volume). They contain, along with (75–80)% of
and (18–23)% of А1
, calcium, iron, and
magnesium oxides. Clay silicas are water-proof
materials possessing high mechanical resistance [1, 2].
The study is concerned with determination of the
quantitative characteristics of a process of nickel ions
adsorption on a natural sorbent silica clay.
We used silica clay from the Ul’yanovsk region.
The sorbent was ground to 1–2-mm fraction . We
used for the study the model nickel sulfate solutions
containing 10–100 mg l
of nickel cations.
The sorption properties of silica clay were
determined by static method. The sorbent (1 g) was
placed into a 50-ml flask with a solution containing a
fixed concentration of nickel ions. The mixture was
agitated for 2 h and the sorbent was filtered. The
concentration of nickel ions in the filtrate was
determined photocolorimetrically by the standard
procedure [Federal Nature Conservation Act (FNCA)
The results of the analyses were processed by the
Microsoft Excel software. The arithmetic mean x
deviation d = x – x
standard deviation S = √Σd
/(n – 1),
and confidence interval x
± S t
/n were cal-
culated. The given confidence probability was α = 0.95.
The total number of the determinations was n = 4, the
number of the degrees of freedom, K = n – 1 = 3, and
the Student’s coefficient, t
= 3.18 .
Quantitatively, the adsorption Г is determined by
excess substance at the interface in comparison with its
equilibrium amount in the solution. The comparison of
the initial concentration of the cation in the solution
with the residual concentration of metal ions warrants
a conclusion to be made about the adsorption capacity
of a given ion on a sorbent under study and about the
properties of the sorbent.
Experimentally, the adsorption Г of dissolved
substances on solid sorbent and the extraction degree α
(%) was determined from the equations
are the initial and equilibrium
concentrations of the ions in the solution, respectively,
is the mass of the sorbent, and V
, the volume of