镧掺杂的二氧化钛纳米颗粒的合成、结构表征及光催化性能

Synthesis,Characterization and Photocatalytic Activity of La-Doped Nanometer TiO_2 Catalysts

以无水乙醇为溶剂、1-丁基-3-甲基咪唑四氟硼酸盐([Bmim]BF4)离子液体为表面活性剂,以钛酸四丁酯、六水合硝酸镧为原料,采用共沉淀法制备了不同掺镧量的La-TiO2光催化材料。采用X-射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)、场发射扫描电镜(FESEM)、差热-热重分析仪(TG-DSC)、紫外-可见吸收光谱仪(UV-vis)、比表面及孔隙度分析仪(BET)对其结构、形貌、热稳定性、光学性能及比表面积进行表征。所制备产品的光催化性能在紫外光下进行了光催化降解甲基橙实验,实验结果表明在离子液体的量为0.5mL,掺杂镧量为5%的TiO2纳米材料对甲基橙的降解效果相对较好,降解率最高达到98.73%。

In the solvent of ethanol, La doped nanoscale TiO2 photocatalyst were prepared by the coprecip- itation method with 1-butyl-3-methyl imidazolium tetrafluoroborate as surfactant, tetrabutyl titanate and Lanthanum nitrate as starting materials. The structure, morphology, element composition, thermal stability, optical property and surface area were characterized by XRD, FTIR FESEM, EDS, TG-DSC, UV-vis and BET. The liquid-phase photocatalytic degradation of methyl orange was used to test the photocatalytic ac-tivity of the synthesized materials. The experimental results showed that the catalytic activities of La-TiO2 nanometer material were better in comparison with the pure TiO2 products. When the mole ratio of doping amount is 5%, La-doped nanometer TiO2 shows the better catalytic behavior with catalytic efficiency up to 98.73 %.