Ultrafine Titania Photocatalytic Materials Synthesized by High Temperature Reaction in TiCl4-O2 System
TiCl4-O2体系高温反应制备超细TiO2光催化材料的研究

Ultrafine titania particles were synthesized by the gas-phase oxidation of titanium tetrachloride in a high temperature tubular aerosol flow reactor. The measurement of EDS, TG-DTA,TEM, XRD and BET surface area was used to characterize the particles. The effect of residencetime and reaction temperature on the morphology of titania particles was investigated. The resultsshowed the average particle size of titania became larger and rutile weight fraction increased as theresidence time increased, and the maximum rutile weight fraction was attained at 1300 and theparticle size increased with increasing temperature. The prepared particles and commercial TiO2were employed for photocatalytic degradation of azo dye active red X--3B in aerated solution. Theresults showed that the photoactivity of the titania particles of average size 35.3nm and 18.97%rutile fraction was higher than that of P25 and SH--1.