BaF2: NaxAlyFx+3y/TiO2 composite as a novel visible-light-driven photocatalyst based on upconversion emission

LIU Enzhou; FAN Jun; HU Xiaoyun; HOU Wenqian; DAI Hongzhe

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BaF2: NaxAlyFx+3y/TiO2 composite as a novel visible-light-driven photocatalyst based on upconversion emission

LIU Enzhou 1,FAN Jun 1 * #,HU Xiaoyun 2,HOU Wenqian 1,DAI Hongzhe 1

1.School of Chemical Engineering, Northwest University, Xi\'an 710069

2.Department of Physics, Northwest University, Xi\'an 710069

*Correspondence author

#Submitted by

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Funding: Northwest University Graduate Cross-discipline Funds（No.No. 09YJC24 and 09YJC27）, Specialized Research Fund for the Doctoral Program of Higher Education （No.No. 20096101110013）, National Natural Science Foundation of China（No.No. 20876125）

Opened online:25 June 2012

Accepted by: none

Citation: LIU Enzhou,FAN Jun,HU Xiaoyun.BaF2: NaxAlyFx+3y/TiO2 composite as a novel visible-light-driven photocatalyst based on upconversion emission[OL]. [25 June 2012] http://en.paper.edu.cn/en_releasepaper/content/4482567

A rare-earth free upconversion luminescence agent, BaF2: NaxAlyFx+3y (0.3＜x＜0.5, 0＜y＜0.1), was synthesized by a hydrothermal method. The fluorescence spectrum studies indicated that it could transform visible light (550-610 nm) into ultraviolet light (290-350 nm), and two emission peaks at 304 and 324 nm were observed under the excitation of 583 nm at the room temperature. Subsequently, BaF2: NaxAlyFx+3y/TiO2 composite photocatalyst was prepared and its catalytic activity was evaluated by the photocatalytic reduction of CO2 under visible light irradiation (λ＞515 nm). The results showed that BaF2: NaxAlyFx+3y/TiO2 was an effective photocatalyst for CO2 reduction than pure TiO2, the corresponding methanol yields were 179 and 0 μmol/g-cat under the same conditions. Additionally, the mechanism of photocatalytic reduction of CO2 on BaF2: NaxAlyFx+3y/TiO2 was proposed.

Keywords:rare-earth free upconversion luminescence agent; ultraviolet emission; titanium dioxide; photocatalytic reduction of CO2

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