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通过相图分析,确定制备纳米TiO2的微乳液组成为:甲苯、正丁醇以及水的质量百分数分别为88.9%,5.0%和6.1%。以硅胶为载体、钛酸丁酯为原料,通过微乳液法制得平均晶粒度为6.3nm的锐钛矿型纳米TiO2负载催化剂。研究了焙烧温度和m(TiO2)∶m(硅胶)比例对紫外光照射下纳米TiO2降解溶液中苯酚的光催化活性的影响。结果表明,焙烧温度从400℃提高到700℃时,TiO2晶粒度从6.3nm增加到的83.2nm,而催化活性先增大后降低,在450℃时催化活性最大,苯酚的去除率45.6%;随着m(TiO2)∶m(硅胶)的减小,催化剂活性先增加后降低,在m(TiO2)∶m(硅胶)为0.05/1000时催化剂活性达到最大。
By phase diagram analysis, it was determined that the preparation of nano-TiO2 microemulsion composition: the mass percent of toluene, n-butanol and water were 88.9%, 5.0% and 6.1% respectively. Using silica gel as carrier and butyl titanate as raw material, an anatase nano-TiO2 supported catalyst with average grain size of 6.3nm was prepared by microemulsion method. The effects of calcination temperature and the ratio of m (TiO2): m (silica) on the photocatalytic activity of phenol in the nanometer TiO2 solution under UV irradiation were studied. The results show that when the calcination temperature is increased from 400 ℃ to 700 ℃, the grain size of TiO2 increases from 6.3nm to 83.2nm, the catalytic activity first increases and then decreases, and the catalytic activity reaches the maximum at 450 ℃ with the phenol removal efficiency of 45.6% The catalyst activity first increased and then decreased with the decrease of m (TiO2): m (silica gel), and the catalyst activity reached the maximum at 0.05 / 1000 m (TiO2): m silica gel.