Res. Chem. Intermed.
, Vol. 34, No. 4, pp. 319–329 (2008)
Koninklijke Brill NV, Leiden, 2008.
Also available online - www.brill.nl/rci
Analysis of preparation of TiO
particles by diffusion ﬂame
reactor for photodegradation of phenol and toluene
, DONG-JOO KIM
and KYO-SEON KIM
Department of Chemical Engineering, Kangwon National University, Chuncheon, Kangwon-do,
200-701, South Korea
Center of Excellence in Particle Technology, Faculty of Engineering, Chulalongkorn University,
Bangkok, 10330, Thailand
Received 2 May 2007; accepted 31 August 2007
nanoparticles were produced in the diffusion ﬂame reactor, and the size and
anatase/rutile content of TiO
were examined by a Particle Size Analyzer and X-ray diffraction,
respectively. Increase in fuel/O
ratio, initial concentration of TiCl
or total gas ﬂow rate causes the
larger particle size and the higher rutile composition. The photocatalytic activities of TiO
were tested on the decompositions of phenol and toluene in the aqueous solution under UV irradiation.
The degradation rate increases as the TiO
particle size decreases and as the initial concentration of
phenol or toluene increases. The photodegradation rate of phenol by TiO
particles is higher than that
of toluene at the same process conditions. The computational method was used to simulate the gas
temperature, velocity and species mass fractions inside the diffusion ﬂame reactor during synthesis
nanoparticles. The measured and simulated temperature results were compared on several
positions above the burner and both of them show good agreements. The typical contours of TiCl
mass fractions and gas velocities in ﬂame reactor were presented.
photocatalysts; diffusion ﬂame reactor; photodegradation; phenol; toluene; computa-
tional analysis of ﬂame reactor.
Because of the many unique photocatalytic properties of TiO
, many researchers
have focused on the applications of TiO
photocatalysts, such as the decomposi-
tion of VOCs , self-cleaning surface  and hydrogen generation by water split-
ting . Several methods have been employed to produce TiO
at a commercial scale the ﬂame aerosol technique is the most widely used process
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