TiCl_4-O_2体系高温反应制备超细TiO_2光催化材料的研究

Ultrafine Titania Photocatalytic Materials Synthesized by High Temperature Reaction in TiCl_4-O_2 System

高温管式气溶胶反应器中，利用ＴｉＣｌ４气相氧化制备超细ＴｉＯ２光催化材料，研究了停留时间和反应温度对粒子形态的影响．结果表明ＴｉＯ２粒度随停留时间延长和反应温度升高而增大；金红石相含量随停留时间延长而增加，当反应温度１３００时，粒子中金红石含量出现最大值．以偶氮染料活性艳红Ｘ－３Ｂ为模拟废水；考察粒子光催化活性．光催化活性与粒径和晶型等形态指标有关，等效粒径３６．４ｎｍ、金红石含量１８９７％ＴｉＯ２的活性高于商品Ｐ２５和ＳＨ－１．

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.