Analysis of preparation of TiO2 particles by diffusion flame reactor for photodegradation of phenol and toluene
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TiO2 nanoparticles were produced in the diffusion flame reactor, and the size and anatase/rutile content of TiO2 were examined by a Particle Size Analyzer and X-ray diffraction, respectively. Increase in fuel/O2 ratio, initial concentration of TiCl4 or total gas flow rate causes the larger particle size and the higher rutile composition. The photocatalytic activities of TiO2 powders were tested on the decompositions of phenol and toluene in the aqueous solution under UV irradiation. The degradation rate increases as the TiO2 particle size decreases and as the initial concentration of phenol or toluene increases. The photodegradation rate of phenol by TiO2 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 of TiO2 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 TiCl4, TiO2 mass fractions and gas velocities in flame reactor were presented.
KeywordsTiO2 photocatalysts diffusion flame reactor photodegradation phenol toluene computational analysis of flame reactor
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