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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、m(TiO2):m(硅胶)、溶液pH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TiO2:硅胶(质量比)为0.05/1000时催化剂活性达到最大;溶液pH值小于6时,苯酚去除率随pH值减小而增大,但变化并不太明显;pH值大于6时,苯酚去除率随pH值增大而增大。
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, m (TiO2): m (silica gel) and solution pH on the photocatalytic activity of phenol in 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% ; With the decrease of m (TiO2): m (silica gel), the catalyst activity first increased and then decreased, and the catalyst activity reached the maximum when the TiO2 / silica gel mass ratio was 0.05 / 1000; The rate increased with the decrease of pH, but the change was not obvious. When the pH was higher than 6, the phenol removal rate increased with the increase of pH.