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以钛酸丁酯为原料,用醇盐水解法制备纳米TiO2,用SiO2掺杂纳米TiO2.并对高温处理后的掺杂纳米TiO2光催化活性进行研究。XRD和TEM研究结果表明,SiO2掺杂能有效的提高晶相转变温度,阻止TiO2从锐钛矿型向金红石型的转变和晶粒的长大。实验结果表明,在1050℃高温处理后,SiO2掺杂后的TiO2仍为锐钛矿型纳米晶体。用掺杂纳米TiO2对甲基橙的降解率来表征其光降解性能,SiO2掺杂TiO2在高温处理后依然具有较好的光催化活性,850℃处理后其甲基橙降解率由未掺SiO2时的11%提高到96.48%,晶粒尺寸则由50nm减小到20 nm.
Titanium tetrabutoxide was used as raw material to prepare nano-TiO2 by alkoxide hydrolysis and nano-TiO2 by SiO2, and the photocatalytic activity of doped nano-TiO2 after high temperature treatment was studied. XRD and TEM results show that the doping of SiO2 can effectively increase the crystal phase transition temperature and prevent the transformation of TiO2 from anatase to rutile and the grain growth. The experimental results show that after the high temperature treatment at 1050 ℃, the TiO2 doped with TiO2 remains anatase nanocrystals. Degradation rate of methyl orange with doped nano-TiO2 was used to characterize its photodegradation performance. SiO2-doped TiO2 still had good photocatalytic activity after being treated at high temperature. The degradation rate of methyl orange after 850 ℃ treatment was determined by non-doped SiO2 When the 11% to 96.48%, the grain size from 50nm to 20nm.