OF SYSTEMS AND PROCESSES
Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 1, pp. 41−45.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © L.N. Skvortsova, L.N. Chukhlomina, G.M. Mokrousov, V.N. Batalova, J.J. Wu, 2012, published in Zhurnal Prikladnoi Khimii, 2012,
Vol. 85, No. 1, pp. 44−48.
Catalytic Oxidation of Phenol in the Presence
of Iron-containing Composites
Based on Silicon and Boron Nitrides
L. N. Skvortsova
, L. N. Chukhlomina
, G. M. Mokrousov
, V. N. Batalova
, and J. J. Wu
Tomsk State University, Tomsk, Russia
Department of Structural Macrokinetics, Tomsk Scientiﬁ c Center, Siberian Branch,
Russian Academy of Sciences, Tomsk, Russia
Feng Chia University, Taiwan
Received November 18, 2010
Abstract—Sorption and catalytic activities of iron-containing composites based on silicon and boron nitrides in
puriﬁ cation of aqueous solutions to remove phenol under ozonation and UV irradiation in the presence of oxalic
acid and hydrogen peroxide additives was studied.
Water can be effectively puriﬁ ed to remove stable
soluble organic substances by means of heterogeneous
and homogeneous catalysis, with the high oxidizing
capacity of hydroxyl radicals used.
OH radicals are
formed under ozonation or UV irradiation in the
presence of oxygen-containing catalysts and reagents.
A high activity in oxidation of soluble organic substances
under UV irradiation is exhibited by photocatalysts
based on titanium dioxide , bismuth(III) oxide ,
vanadium(IV/V) oxides , and Bi
, , and V(IV/V)/TiO
composites. A photoactivity in homogeneous catalysis
is exhibited by the ferrioxalate system , including
that with addition of hydrogen peroxide (Raff–Fenton
system) [9, 10].
It has been found previously  that B–N–Fe
composites exhibit a high catalytic activity and lead
to a deep degradation of oxalic acid because of the
formation of a ferrioxalate in solution, i.e., there occurs
combination of the homogeneous and heterogeneous
kinds of catalysis. It was of interest to study how Fe-
containing composites based on boron and silicon
nitrides can be used in the presence of oxalic acid for
decomposition of other organic toxicants for the example
of phenol (its maximum permissible concentration,
MPC, in water is 0.001 mg l
In this study, we examined the sorption and catalytic
activity of Si–N–Fe and B–N–Fe composites in relation
to the solution pH, external treatment duration, oxalic
acid additives [to raise the amount of the photocatalyst
], and dispersity of the material.
Composite materials were produced by nitriding
ferrosilicon and ferroboron by self-propagating high-
temperature synthesis (SHS) in the presence of various
pore-forming agents (urea, ammonium hydrocarbonate).
The self-propagating synthesis of iron-containing
composites was performed in a constant-pressure
installation with a working volume of 3 l and maximum
working pressure of up to 15 MPa. A starting alloy
with addition of a pore-forming agent was poured into
cylindrical tubes with a diameter of 40–60 mm and a gas
permeable wall. The relative density of the samples
was 0.4. The samples were burnt in the atmosphere of
gaseous nitrogen, 99.996 vol % [GOST (State Standard)
9293–74]. The nitrogen pressure was varied within
the range 1–10 MPa. The samples were ignited with
a tungsten coil. After the combustion front passed,