CuO/Er-Yb-TiO<sub>2</sub>的制备及在模拟可见光下催化CO<sub>2</sub>合成甲醇

doi:10.11896/cldb.18120019

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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 ²H_11/2→⁴I_15/2,⁴S_3/2→⁴I_15/2 and ⁴F_9/2→⁴I_15/2 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.

Key words： titanium dioxide rare earth up-conversion visible-light catalysis carbon dioxide methanol

Published: 03 January 2020

CLC number:

TQ034

About author:: Sa Xiaoreceived his B.E. degree from Wuhan Institute of Technology in 2017. He is currently a graduate student in chemical engineering at Hainan University, mainly engaged in photocatalysis research;Chunrong Xiongreceived his M.S. degree from Fudan University in 1998, and worked at Shanghai Research Institute of Petrochemical Engineering from 1998 to 2002. He furthered his study at the University of Texas for a Ph.D. during 2003—2007. Upon graduation he worked as a postdoctoral at the University of California at Merced. Since August of 2008, he has been working at Hainan University. His research inte-rests cover functional membrane materials, nanomate-rials and indust-rial catalysis.

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	XIAO Sa
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Cite this article:

XIAO Sa,TAN Heng,WU Shanni, et al. Preparation of CuO/Er-Yb-TiO₂ and Catalytic Synthesis of Methanol from CO₂ Under Simulated Visible-light[J]. Materials Reports, 2020, 34(2): 2005-2009.

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http://www.mater-rep.com/EN/10.11896/cldb.18120019 OR http://www.mater-rep.com/EN/Y2020/V34/I2/2005

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