Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 1, pp. 71−75.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © E.S. Bobkova, A.A. Isakina, V.I. Grinevich, V.V. Rybkin, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85, No. 1, pp. 75−79.
AND INDUSTRIAL ORGANIC CHEMISTRY
Decomposition of Aqueous Solution of Acetic Acid
under the Action of Atmospheric-Pressure Dielectric Barrier
Discharge in Oxygen
E. S. Bobkova, A. A. Isakina, V. I. Grinevich, and V. V. Rybkin
Ivanovo State University of Chemical Engineering, Ivanovo, Russia
Received December 3, 2010
Abstract—Decomposition of an aqueous solution of acetic acid under the action of an atmospheric-pressure
dielectric barrier discharge in oxygen in a ﬂ ow-through reactor was studied. A mechanism of chemical reactions
is suggested, which describes the decomposition of the acid and formation of the reaction products observed.
The problem of water treatment to bring its quality to
the potable water level is one of the most topical issues.
The commonly used methods of water puriﬁ cation,
such as chlorination, ozonation, UV irradiation, are
comparatively expensive and fail to always provide
the required efﬁ ciency . That is why puriﬁ cation
techniques based on high-energy chemical methods,
radiative, photochemical, and plasmochemical have
been intensively studied recently [2, 3]. In fact, the
ozonation and UV irradiation are processes of this kind
because both ozone and UV light are produced by some
The energy efﬁ ciency of these methods is poor
because they use only a small part of opportunities
furnished by a discharge, which yields a large number
of active species capable of effective decomposition of
organic impurities. These are radicals, excited atoms
and molecules, electrons, and ions. Their use requires
a special organization of the process because, as a rule,
these species are short-lived. Therefore, various kinds of
gas discharges that are in direct contact with a solution
being processed are promising.
A large number of designs of this kind have been
developed. For example, these are the corona discharge
burning over the surface of a solution , dc discharge in
a ﬂ uid , pulsed streamer discharge in solution , and
dielectric barrier discharge (DBD) . Decomposition
products are of particular interest because, even upon
full decomposition of the main substance, they will
determine the puriﬁ cation quality. However, data of
this kind cannot be found in the overwhelming majority
of known reports and the efﬁ ciency of a particular
type of treatment is judged from the decrease in the
concentration of the main organic contaminant . Only
in [5, 7, 9], it was noted that carboxylic acids accumulate
in the course of time in aqueous solutions in destruction
of phenol and its oxy derivatives.
In this study, we examined the decomposition of an
aqueous solution of acetic acid in a DBD in order to ﬁ nd
whether it is possible and advisable to use the discharge
both in removal of the acid itself and in processes in
which the acid is a reaction product.
The experimental installation was described in
detail in . The reactor for DBD generation had the
form of a vertical Pyrex tube with an outer diameter of
12 mm and wall thickness of 1.7 mm, which served as
the dielectric barrier for the discharge. An aluminum
alloy electrode with a diameter of 8 mm was coaxially
mounted within the tube. The electrode was coated
with a hydrophilic glass fabric with a thickness of
about 1 mm. The discharge zone length L was 12 cm.
A solution was introduced through radial oriﬁ ces in the
upper part of the internal electrode and ﬂ owed down