Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 11, pp. 1676−1681.
Pleiades Publishing, Ltd., 2013.
Original English Text © V.V. Samonin, A.V. Chechevichkin, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86, No. 11, pp. 1724−1729.
AND SEPARATION PROCESSES
Speciﬁ c Features of the Absorption of Divalent Manganese Ions
from Aqueous Solutions by Zeolites
V. V. Samonin and A. V. Chechevichkin
St. Petersburg State Technological Institute (Technical University), St. Petersburg, Russia
Received May 18, 2013
Abstract—Sorption properties of natural zeolites from various Russia’s deposits for the Mn
ion were studied
in comparison with various industrial adsorbents and some minerals. It was demonstrated that the equilibrium
sorption capacity of these materials can be raised by their Na
-modiﬁ cation. The natural zeolites are advantageous
at low Mn
ion concentrations over synthetic cation exchangers and activated carbons. The sorption capacity of
the natural zeolites grows with increasing temperature.
Possessing unique structural and sorption properties,
zeolite materials (ZMs), both synthetic and natural,
are widely used in various technological processes ,
which requires their more in-depth study.
Natural zeolites (NZs) have a substantial sorption
capacity for divalent metal ions [2, 3], but their ability
to absorb the Mn
ion has hardly been examined.
At the same time, the sorption capacity of ZMs for
ion is a most important characteristic to be
taken into account in puriﬁ cation of ground water [4,
5] and syntheses of MnO
-containing catalytic materials
and also NZ-based materials with clearly pronounced
magnetic properties [8, 9].
The goal of our study was to examine the sorption-
desorption properties of ZMs, both natural and synthetic,
in comparison with other industrial adsorbents (activated
carbons, ion-exchange resins) and some materials used
in water-treatment practice.
Natural zeolites promising for removal of Mn
from solutions are represented on Russia’s territory
by rocks of predominantly clinoptilolite type [10, 11].
We studied NZs with a clinoptilolite content of no less
than 60 wt % from the following deposits: Lyugotskoe
(Sakhalin); Chuguevskoe (Primorsky krai); Mysovskoe
(North Urals); Badinskoe, Shivyrtuiskoe, and
Kholinskoe (Chita oblast); and Sokirnitskoe (Ukraine).
Two samples of a zeolitized tripoli (with clinoptilolite
content of 25–30%) from deposits in Orel (Khotynetskoe)
and Bryansk oblasts served for comparison. Samples
were taken from each batch of NZs with a total mass of
no less than 10 kg by the quartering method. The samples
were ground, sieved, washed to remove dust, and dried
in a thermostat at a temperature of 140°C for 4 h. The
prepared samples (0.5–0.8 mm fraction) were stored in
the air-dry state in hermetically sealed packages.
The sorption of Mn
ions from a solution of the salt
O (chemically pure grade) was performed at
a phase mass ratio of 1 : 100 in the course of 24 h under
periodic agitation. The process temperature of 20 ± 1°C
was maintained with a water thermostat.
On performing an experiment, we discharged the
solution and sampled it for a quantitative analysis for
. The zeolite itself was carefully washed in the
vessel with distilled water no less than 10 times in order
to remove residual amounts of the working solution.
Upon the adsorption, the solutions containing
ions were subjected to a quantitative analysis in