Preparation of TiO_2 nanoparticle and their photocatalytic property

TiO2 nanoparticle are prepared by the method of solgel, and tetrabutyl titanate was used as raw material. The photocatalytic activity of the samples was evaluated by photocatalytic oxidation reaction of toluene on the samples. The effects of calcining temperature on crystal form, size and photocatalytic activity of the samples are studied. The results analyzed by XRD showed that the samples were anatase TiO2 when the calcining temperature was lower than 500 ℃,but they were rutile at 700 ℃. The size of samples increased and the photocatalytic activity reduced as the calcining temperature went up. The photocatalytic oxidation process of toluene on TiO2 is first order reaction.