Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 8, pp. 1351−1356.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
G.A. Voronova, M.P. Fedotova, E.Yu. Emel’yanova, O.V. Vodyankina, 2009, published in Zhurnal Prikladnoi Khimii, 2009, Vol. 82,
No. 8, pp. 1256−1260.
INORGANIC SYNTHESIS AND INDUSTRIAL
At present, the practical application of photocatalysis
is mostly restricted by the low sensitivity of photocatalysts
to visible light and by the slow rate of photocatalytic
reactions. Among photocatalysts, the wide-bandgap n-type
is the most promising for a wide
variety of photocatalytic reactions because of its high
activity, nontoxicity, and resistance to electrochemical
and photochemical corrosion [1–3]. Among the main
modifications of TiO
(rutile, anatase), the highest
photochemical activity is exhibited by anatase whose
energy gap is about 3.2 eV [3, 4]. It is believed that the
higher activity of anatase, compared with rutile, is due to
the higher lying Fermi level, better capacity for oxygen
adsorption, and high degree of hydroxylation . The
maximum absorption by TiO
is in the near-UV spectral
range (λ < 400 nm), and, therefore, UV irradiation
at wavelengths shorter than 400 nm is necessary for
a photocatalytic conversion involving TiO
. Most of
studies have been devoted to photocatalytic processes
with a Degussa P25 TiO
commercial catalyst [4–6]
whose activity is frequently taken as reference.
A promising method for synthesis of a wide variety
of nanopowders of inorganic materials (metals, alloys,
chemical compounds) is the method of an electric
explosion of a conductor (EEC technique) . Compared
with other methods used to produce metal oxides by
evaporation of a metal and its subsequent condensation
and oxidation, etc. , synthesis of nanopowders by
electric explosion is advantageous because of the direct
conversion of electric power to heat. A pulsed volume
heating provides high energy densities and fast rates of
scattering and cooling of a substance. Particles produced
in this way have size, structural, phase, defective, and
other energy-saturated states .
The method in which a titanium dioxide powder is
produced by an electric explosion of a titanium wire in an
oxygen-containing atmosphere [7–10] makes it possible
to obtain particles 10 to 300 nm in size and to control
the chemical and phase composition and the structure of
the nanopowder. Use of systems produced by an electric
explosion as photocatalysts is rather promising because
the nanopowder contains a large number of defects and,
as a consequence, of active surface centers, as well.
These studies are new and can expand application ﬁ elds
The aim of this study was to perform an integrated
analysis of structural features and physicochemical
and photocatalytic properties of an electric-explosion-
produced titanium dioxide nanopowder.
The titanium dioxide nanopowder (EEP TiO
produced by an electric explosion of a titanium conductor
in an oxygen-containing atmosphere (15 vol %).
Photocatalytic Properties of Electric-Explosion-Produced TiO
G. A. Voronova
, M. P. Fedotova
, E. Yu. Emel’yanova
, and O. V. Vodyankina
Tomsk Polytechnic University, Tomsk, Russia
Tomsk State University, Tomsk, Russia
Received December 22, 2008
Abstract—Structural features and physicochemical and photocatalytic properties of an electric-explosion-produced
titanium dioxide powder were studied by means of X-ray phase and X-ray diffraction analyses, transmission
electron microscopy, thermal analysis, and optical spectroscopy.
Laboratory at Advanced Powder Technologies Limited-Liability
Company, Regional Innovation-Technological Center, Siberian
Branch, Russian Academy of Sciences.