溶胶-凝胶法制备铈和硅共掺杂二氧化钛

Preparation of cerium and silicon doped TiO_2 by Sol-Gel method

以硝酸铈(Ce(NO_3)_3·6H_2O)、钛酸四丁酯(TBT、)、正硅酸乙脂(TEOS)为原料,采用溶胶-凝胶法制备了Ce和Si共掺杂的TiO_2(Ce-Si/TiO_2)光催化剂。以甲基橙为目标降解物,在可见光照射下,考察了Ce掺杂量、Si掺杂量、陈化时间、焙烧温度、焙烧时间对Ce-Si/TiO_2光催化性能的影响。实验结果表明:当Ce(NO_3)_3·6H_2O与TBT的物质的量比为0.01,TEOS与TBT的物质的量比为0.15,陈化时间为12 h,焙烧温度为500℃,焙烧时间为3 h,所制得的催化剂催化效果最佳,经可见光照射5 h,甲基橙降解率可达到95.6%。

Using cerium nitrate （Ce（NO3）3 6H20）, tetrabutyl titanate （TBT） and tetraethyl orthosilicate （TEOS） as raw material, Ce-Si/TiO2photocatalyst is obtained successfuUy by sol-gel method. The influence of Ce dosage, Si dosage, aging time, calcination temperature and calcination time on the photocatalytic activity was studied.The results indicated that the highest photocatalytic activity was obtained under above conditions： cerium nitrate and tetrabutyl titanate molar ratio was 0.01, tetraethyl orthosilicate and tetrabutyl titanate molar ratio was 0.15, aging time was 12 h, calcination temperature was 500 ℃ and calcination time was 3 h. The degradation rate of methyl orange reached 95.6% under visible light irradiation for 5 h.