Preparation of CuO/Er-Yb-TiO2 and Catalytic Synthesis of Methanol from CO2 Under Simulated Visible-light
XIAO Sa, TAN Heng, WU Shanni, ZENG Min, XIONG Chunrong
Special Glass Key Laboratory of Hainan Province,State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan University,Haikou 570228,China
Abstract: Er3+ and Yb3+ co-doped TiO2 (Er-Yb-TiO2) nanoparticles were successfully synthesized by employing sol-gel method. Furthermore, CuO was loaded onto the Er-Yb-TiO2 by impregnation method, thus CuO/Er-Yb-TiO2 was obtained, utilizing in catalysis of CO2 reduction to prepare methanol. The characterization of the catalysts samples was carried out by means of scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), ultraviolet-visible spectrometer (UV-vis) and fluorescence spectrophotometer (PL). According to the analytic results, the doping of Er3+ and Yb3+ in TiO2 would bring about intense upconverted emissions in the visible region at 525 nm, 549 nm and 661 nm, which are ascribed to the 2H11/2→4I15/2,4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of Er3+, under the excitation of near-infrared light at 980 nm. Additionally, incorporation of Er3+ and Yb3+ in TiO2 also inhabited the recombination of the excited electron-hole pairs. Loading CuO onto the Er-Yb-TiO2 or TiO2 might contribute to the absorption of the visible light and the stability of the photogenerated electron-hole pairs, which resulted in a better photocatalytic performance. Visible-light driven reduction of CO2 for methanol preparation was conducted under irradiation of 300 W Xe lamp for 2 h, taking pure TiO2, CuO/TiO2, Er-Yb-TiO2 and CuO/Er-Yb-TiO2 as catalysts. The results revealed that pure TiO2 showed a methanol yield of 23.9 μmol·g-1, the Er-Yb-TiO2 doped with 2.5mol% Yb3+ and 1mol% Er3+ exhibited a methanol yield of 116.7 μmol·g-1. The methanol yields of CuO/TiO2 and CuO/Er-Yb-TiO2 were raised to 69.1 μmol·g-1 and 281.2 μmol·g-1, due to the increased absorption of visible light by CuO loading. Consequently, CuO/Er-Yb-TiO2 can efficiently catalyze the reduction of CO2 for methanol preparation.
肖洒, 谈恒, 吴珊妮, 曾敏, 熊春荣. CuO/Er-Yb-TiO2的制备及在模拟可见光下催化CO2合成甲醇[J]. 材料导报, 2020, 34(2): 2005-2009.
XIAO Sa, TAN Heng, WU Shanni, ZENG Min, XIONG Chunrong. Preparation of CuO/Er-Yb-TiO2 and Catalytic Synthesis of Methanol from CO2 Under Simulated Visible-light. Materials Reports, 2020, 34(2): 2005-2009.
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2020, Vol. 34 
