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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.
La and Cu co-doped nano-TiO2 powders were prepared by sol-gel method and characterized by XRD, HR-TEM and XPS. The structure and morphology of La / Cu / TiO2 catalytic materials were studied.The effect of different La doping on the formation of formaldehyde was studied.The results showed that photocatalytic reduction of 0.1% La / 0.6% Cu / TiO2 CO2 was the best, with 0.2 mol / L NaOH as the reductant and 300 W high pressure mercury lamp (the main wavelength was 365 nm) as the irradiation light source. When the photocatalytic reaction was 6 h, the formation of formaldehyde was the largest Up to 304.49, μmol / gcat.