Particle and Aerosol Research Vol. 2, No. 1, March 2006 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Synthesis and characterization of TiO2-SiO2 nanoparticles for photocatalyst
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Abstracts
Titania-silica (TiO2-SiO2) nanoparticles for a photocatalyst were synthesized by the gas phase oxidation of TiCl4
and various silica precursors in a diffusion flame reactor. The silica precursors employed were TEOS, TMOS, and
SiCl4. The synthesis of the composite particles was characterized by TEM-EDS and FT-IR analysis. Effects of
precursor molar ratio (Si/Ti) and choice of a silica precursor on the particle shape, size, specific surface area and
crystal structure were investigated. As the molar ratio of Si/Ti increased, the average diameter and specific surface
area of the composite particles increased, while the mass fraction of anatase decreased. Depending on the chosen
silica precursor, the particle diameter and the mass fraction of anatase varied, ranging from 10 nm to 30 nm and
from 50% to 82%, respectively. Photocatalytic property of the composite nanoparticles on the decomposition of
methylene blue was also measured. The decomposition degree of methylene blue increased as the molar ratio
decreased. TMOS was the most effective, among the investigated silica precursors, for the decomposition of
methylene blue.
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