La和Cu共掺纳米TiO_2光催化转化CO_2研究

CO_2 Photoconversion Activities of La and Cu Co-Doped TiO_2 Nanoparticles

采用溶胶-凝胶法制备了La、Cu共掺杂的纳米TiO2粉体,并用X射线衍射(XRD)、高分辨透射电镜(HR-TEM)和X射线光电子能谱(XPS)等技术表征了La/Cu/TiO2催化材料的结构和形貌.研究了不同La元素掺杂量对CO2还原产物甲醛生成量的影响.结果表明,质量分数0.1%La/0.6%Cu/TiO2材料的光催化还原CO2性能最佳,以0.2,mol/L NaOH作为还原剂、300,W高压汞灯(主波长为365,nm)为辐照光源、光催化反应6,h时,甲醛的生成量最大,可达304.49,μmol/gcat.

A series of La and Cu co-doped TiO2 nanoparticles were synthesized via sol-gel method.The crystal struc-tures,morphologies and chemical properties were characterized using X-ray diffraction(XRD),high resolution transmission electron microscopy(HR-TEM)and X-ray photoelectron spectroscopy(XPS).The effects of different La doping amounts on the reaction of CO2 photoconversion were investigated.The results showed that 0.1%La/0.6%Cu/TiO2 performed the highest photocatalytic activity,which yielded 304.49 μmol/gcat formaldehyde after 6 h of UV illumination.