10BaF2:NaF, Na3AlF6/TiO2 composite as a novel visible-light-driven photocatalyst based on upconversion emission |
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Authors: | Liu En-Zhou Fan Jun Hu Xiao-Yun Hou Wen-Qian Dai Hong-Zhe |
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Affiliation: | a) School of Chemical Engineering, Northwest University, Xi'an 710069, China b) Department of Physics, Northwest University, Xi'an 710069, China |
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Abstract: | A rare-earth free upconversion luminescent material, 10BaF2:NaF, Na3AlF6/TiO2, is synthesized by a hydrothermal method. The study of fluorescent spectrum indicates that it can convert visible light (550 nm-610 nm) into ultraviolet light (290 nm-350 nm), and two emission peaks at 304 nm and 324 nm are observed under the excitation of 583 nm at room temperature. Subsequently, 10BaF2:NaF, Na3AlF6/TiO2 composite photocatalyst is prepared and its catalytic activity is evaluated by the photocatalytic reduction of CO2 under visible light irradiation (λ>515nm). The results show that 10BaF2:NaF, Na3AlF6/TiO2 is a more effective photocatalyst for CO2 reduction than pure TiO2, their corresponding methanol yields are 179 and 0 upmumol/g-cat under the same conditions. Additionally, the mechanism of photocatalytic reduction of CO2 on 10BaF2:NaF, Na3AlF6/TiO2 is proposed. |
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Keywords: | rare-earth free upconversion luminescent material ultraviolet emission titanium dioxide photocatalytic reduction of CO2 |
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