Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 3, pp. 366−370.
Pleiades Publishing, Ltd., 2013.
Original Russian Text © V.V. Samonin, M.L. Podvyaznikov, M.S. Chentsov, E.A. Spiridonova, V.L. Kiseleva, 2013, published in Zhurnal Prikladnoi Khimii,
2013, Vol. 86, No. 3, pp. 395−400.
OF SYSTEMS AND PROCESSES
Effect of Electromagnetic Treatments
on the Sorption–Desorption of Water Vapor
by Impregnated Silica-based Sorbents
V. V. Samonin, M. L. Podvyaznikov, M. S. Chentsov, E. A. Spiridonova, and V. L. Kiseleva
St. Petersburg State Technological Institute, St. Petersburg, Russia
Received April 27, 2012
Abstract—Considerable inﬂ uence of an ac electromagnetic ﬁ eld of power frequency on the course of sorption
processes employed in air-ﬂ ow drying is demonstrated for the example of impregnated drying agents.
Electromagnetic effects accelerating various chemi-
cal, physical, and physicochemical processes are well
known and widely used in various ﬁ elds of industry, sci-
ence, and technology.
There exist methods for regeneration of sorbents and
drying of materials [1–3] and absorbents in an electric
ﬁ eld or by passing electric current through a stock bed
. In addition, the energy of high-frequency radiation
is used to intensify the desorption of gases and vapors
from adsorbents and absorbents of varied nature and
structure [6, 7].
Compared with processes occurring in gas media,
techniques employing electrical effects in liquid media
have found even wider application. These include
displacement of ionized particles in aqueous media under
the action of an electromagnetic potential , methods
for separation of water from liquid organic compounds
in an electric ﬁ eld , procedures for desorption from
capillary-porous bodies in solutions .
Analyses of the adsorption of water vapor on sorbents
impregnated with hygroscopic salts should pay a greater
attention to the hydration of these salts because moisture
is absorbed by the impregnate on these sorbents by the
It has been found experimentally  that an
electromagnetic treatment strongly affects the hydration
of ions in solutions. The hydration of diamagnetic ions
is diminished; at the same time, a tendency toward
enhanced hydration is observed for paramagnetic ions.
Considerable changes in ion hydration process
are observed in dilute solutions containing structure-
stabilizing ions to which belong the most hydrophilic
) and ions that can form complexes
with water (Fe
). The different ways in
which dia- and paramagnetic ions are hydrated reﬂ ect on
how the structure of pure water changes. If ions possess
diamagnetic properties (similarly to water), the degree
of hydration of these ions will decrease as the structure
of water is strengthened. Ions with higher diamagnetic
) disintegrate the structure of
water and hardly affect the change of its properties upon
a magnetic treatment, with not only types of separate
ions, but also that of their combinations being highly
It has been noted, however, that the effect of a
magnetic treatment is polyextremal, depending on the
strength of the external electromagnetic ﬁ eld and on
the exposure duration [12, 13]. The weakening of the
positive hydration of the paramagnetic Fe
demonstrated for the example of a magnetic treatment
of iron chloride solutions. In some cases, this weakening
leads to a negative hydration, which is accounted for by
the stronger ion–ion interaction between coarsening