Comparative analysis of the effectiveness of the use of sorbents of different nature with respect to copper(II) ions
S. G. Skugoreva, G. Ya. Kantor, L. I. Domracheva, T. I. Kutyavina
Section: Research methods. Models and projects
A comparative analysis of the efficiency of sorbents of various types (activated carbon, zeolite, peat, fungi
Fusarium
culmorum
, cyanobacteria
Nostoc paludosum
K
ü
tz, grass
Hordeum distichum
L.) with respect to copper(II) ions was car
-
ried out. Potentiometric method for measuring the potential of an ion-selective electrode sensitive to concentration of
copper(II) ions in the solution was used. The sorption curves were recorded in real time with the help of specially devel
-
oped original software for the ionomer. To describe the kinetics of sorption, mathematical models (pseudo-first order and
pseudo-second order models, second-order modified model, and Elovich’s model) were used to identify the contribution
of the chemical stage to the sorption process.
It was found that the sorption process of most sorbents is well described by a pseudo-second order model or a modi
-
fied pseudo-second order, according to which the sorbate and the sorbent functional group interact with each other at
a 1:1 ratio. The parameters of the equation of the pseudo-second-order model are calculated: the kinetic coefficient (
k
2
)
determining the sorption rate, and the equilibrium (limiting) specific mass of the sorbate (
a
e
), which corresponds to the
sorption capacity of the sorbent. Series of sorbents have been ranked by decreasing the rate of sorption and sorption capacity.
The comparison of the kinetic curves shows that sorbents of inorganic nature, zeolite and activated carbon have
the least sorption effectiveness. The sorption potential of microorganisms and peat can be characterized as average. The
most effective sorbents of heavy metal ions were samples of barley plants, which possessed the highest sorption rate and
high sorption capacity.
The use of microbial-plant associations as sorbents of heavy metals may be promising. It is necessary to select
microorganisms and plants to create various associations for study the kinetics of sorption with the aim of optimizing
sorption effectiveness.
ISSN 1995-4301
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