Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 5, pp. 768−772.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
N.M. Panich, B.G. Ershov, A.F. Seliverstov, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83, No. 5, pp. 718−722.
INORGANIC SYNTHESIS AND INDUSTRIAL
Decomposition of Sodium Dodecyl Sulfate
with Ozone in Aqueous Solution
N. M. Panich, B. G. Ershov, and A. F. Seliverstov
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia
Received July 13, 2009
Abstract—Decomposition of sodium dodecyl sulfate with ozone in aqueous solution in the presence of high
concentrations of sodium nitrate was studied. The factors affecting ozone interaction with a dissolved compound
In disinfection at radiochemical and nuclear power
plants and in working of special-purpose laundries, the
solutions contaminated with radioactive elements are
formed in considerable volumes. They contain high con-
centration of detergents, surfactants (SAA), and dissolved
salts. The presence of SAA impedes utilization of liquid
radioactive waste (LRW) by traditional methods.
Decomposition of SAA makes technology of LRW
recovery signiﬁ cantly simpler. For this purpose, ozone
decomposition is the promising method [3– 5]. From the
literature, no data is available on the ozonation of SAA
solutions in highly concentrated solutions of salts.
In this study, the oxidative decomposition of anionic
SAA with ozone was studied and factors responsible for
the run of the process in the presence of high concentra-
tions of NaNO
Object of study was anionic SAA, analytically pure
grade sodium dodecyl sulfate (SDS). Solutions were
prepared with twice-distilled water. The concentration
of SDS in the solutions was determined with Methylene
blue (indicator) by the procedure described in .
The ozone was obtained in an ozonizer (Limited
Company “Laboratory of Ozone Technologies”) equipped
with a capillary discharge chamber ensuring formation of
ozone-oxygen mixture (OOM) containing about 150 mg
. The ozonation was performed in a temperature-
controlled reactor. The volume of the reaction mixture
was 450 ml. The ﬂ ow rate of an OOM in the reactor was
. The composition of OOM at the inlet and outlet
of the reactor was monitored within 200–300 nm by the
ozone absorption spectrum (λ
= 255 nm, SF-2000
In the course of the ozonation, рН was maintained
at prescribed value. To do this, a calculated amount of
NaOH was continuously fed at a rate of 20 ml h
a peristaltic pump.
The ozonation in the presence of Н
used the same
procedure, i.e., a continuous introduction of a hydrogen
peroxide solution into the reactor.
The inﬂ uence of inorganic salt on the SDS decom-
position was studied using NaNO
grade). The concentration of the salt was varied from 50
to 300 g l
The reaction kinetics may be monitored by controlling
the composition of a gaseous phase at the reactor outlet
or by measuring the change in concentration of the initial
substance (SDS) in a liquid phase in the course of ozone
Figure 1 presents the dependences of ozone absorption
with a SDS solution at different conditions of the reaction.
Into a solution, an OOM mixture containing a prescribed
concentration of О
was introduced and the concentration
of the solution at the reactor outlet was measured. The
ozonation curve has two sections of ozone consumption:
the time of the ﬁ rst (fast) section is about 5–7 min and
that of the second (slow) section is considerably larger.
After elapsing 10–15 min, the concentration at the reac-