A novel Ru/TiO2 hybrid nanocomposite catalyzed photoreduction of CO2 to methanol under visible light

A novel in situ synthesized Ru(bpy)3/TiO2 hybrid nanocomposite is developed for the photoreduction ofCO2 into methanol under visible light irradiation. The prepared composite was characterized by means ofSEM, TEM, XRD, DT–TGA, XPS, UV–Vis and FT-IR techniques. The photocatalytic activity of the synthesizedhybrid catalyst was tested for the photoreduction of CO2 under visible light using triethylamineas a sacrificial donor. The methanol yield for the Ru(bpy)3/TiO2 hybrid nanocomposite was found to be1876 μmol g−1 cat (ϕMeOH 0.024 mol Einstein−1) that was much higher in comparison with the in situ synthesizedTiO2, 828 μmol g−1 cat (ϕMeOH 0.010 mol Einstein−1) and the homogeneous Ru(bpy)3Cl2complex, 385 μmol g−1 cat (ϕMeOH 0.005 mol Einstein−1).

本研究开发了一种新型原位合成的Ru(bpy)3/TiO2杂化纳米复合材料，用于可见光照射下CO₂光还原制备甲醇。所制备的复合材料通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、差热-热重联用(DT–TGA)、X射线光电子能谱(XPS)、紫外-可见分光光度法(UV–Vis)以及傅里叶变换红外光谱(FT-IR)等技术完成了表征。以三乙胺为牺牲剂，在可见光照射条件下，对该合成杂化催化剂的光催化CO₂还原活性进行了测试。测试结果显示，Ru(bpy)3/TiO2杂化纳米复合材料的甲醇产率可达1876 μmol·g⁻¹_cat（甲醇量子产率ϕMeOH为0.024 mol·Einstein⁻¹），其性能远优于原位合成纯TiO₂的828 μmol·g⁻¹_cat（甲醇量子产率ϕMeOH为0.010 mol·Einstein⁻¹）以及均相Ru(bpy)3Cl₂配合物的385 μmol·g⁻¹_cat（甲醇量子产率ϕMeOH为0.005 mol·Einstein⁻¹）。