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采用溶胶-凝胶法制备掺杂金属改性的TiO2光催化剂,并研究其光催化还原CO2制甲酸甲酯的反应效果。以钛酸丁酯为主要原料,制备纳米TiO2。通过改变金属掺杂量、焙烧温度、前躯体pH等,确定出适宜的催化剂制备条件。结合SEM、XRD、UV-vis等对催化剂进行了形貌、结构和吸光行为的表征。进而考察了其光催化还原CO2的活性。结果表明:溶胶-凝胶法制备掺杂金属的TiO2,可使金属均匀地分布于TiO2表面,经催化活性评价,获得适宜的掺杂元素和掺杂量,优选的制备条件为溶胶pH=2.5～3、凝胶焙烧温度500℃,在催化剂用量1mg/mL,光照强度2880μw/cm2的反应条件下,可有效地促进TiO2光催化还原CO2制甲酸甲酯。
The doped TiO2 photocatalyst doped with metal was prepared by sol-gel method and the photocatalytic reduction of methyl formate by CO2 was studied. Titanate as the main raw material, preparation of nano-TiO2. By changing the amount of metal doping, calcination temperature, pH of the precursor and so on, the suitable catalyst preparation conditions were determined. The morphology, structure and absorption behavior of the catalysts were characterized by SEM, XRD and UV-vis. The photocatalytic activity of CO2 was also investigated. The results show that the metal doped TiO2 can be uniformly distributed on the surface of TiO2 by sol-gel method, and the suitable doping elements and doping amount are obtained through the evaluation of the catalytic activity. The preferred preparation conditions are as follows: sol pH = 2.5 ~ 3, and the calcination temperature of the gel is 500 ℃. Under the reaction conditions of 1mg / mL of catalyst and 2880μw / cm2 of light intensity, TiO2 photocatalytic reduction of methyl formate can be effectively promoted.