利用溶胶凝胶法制备不同掺杂量的CuO—TiO2纳米粉体，采用热重一差热分析仪（TG—DTA），X射线衍射仪（XRD），场发射扫描电镜（FSEM—EDX）等手段对其进行表征；在波长为2537nm的紫外灯照射下，进行C02光催化还原实验研究，探究CO2光催化资源化利用可行性。结果表明，溶胶凝胶法制备所得CuO掺杂TiO2纳米粉体，粒径大小在20-30nm之间；CO2光催化还原主要产物为甲醇，掺杂量为5％（质量分数）CuO—TiO2纳米粉体催化效果最好，反应10h后得到甲醇产量为27mg·（g-cata）-1；随着反应时间的增加，产物中甲醇含量也逐渐增加。
Different doping concentration of copper-doped titania was synthesized by sol-gel method, and the samples were characterized by X-ray diffraction （XRD）; Field emission scanning electron microscope （FSEM -EDX）; Thermo gravimetric-differential thermal analyzer （TG-DTA） respectively. The photoreduction of CO2 experiments was carried out in a photocatalytic reactor under UV irradiation at the wavelength of 253.7 nm for 10 h continuously. The results confirmed that in the copper modified TiO2 samples, the crystalline form of TiO2 exists as anatase; the grain size of all the sol-gel derived CuO-TiO2 samples were nearly 30 nm, and the copper particles were consistent and dispersed on the surface of TiO2. CO2 can be reduced into methanol in the presence of NaHCO3 solution over CuO-TiO2 catalyst. The doping concentration of 5% CuO-TiO2 performed best catalytic effect, with the methanol yield of 27 mg.（g-cata）-1 in 10 h. With increasing reaction time, yield of methanol was promoted.
参考文献
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