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 TiO2 Catalysts

中文关键词:  TiO2  镧  共沉淀法  光催化  表征

英文关键词:TiO2  La  Coprecipitation  Photocatalysis  Characterization

中文摘要:

      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％.

英文摘要:

      In the solvent of ethanol,La doped nanoscale TiO2 photocatalyst were prepared by the coprecipitation 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 activity 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%.