10BaF2:NaF, Na3AlF6/TiO2 composite as a novel visible-light-driven photocatalyst based on upconversion emission

doi:10.1088/1674-1056/21/4/043403

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 ($\lambda$>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 $\mu$mol/g-cat under the same conditions. Additionally, the mechanism of photocatalytic reduction of CO₂ on 10BaF₂:NaF, Na₃AlF₆/TiO₂ is proposed.

Keywords: rare-earth free upconversion luminescent material ultraviolet emission titanium dioxide photocatalytic reduction of CO₂

Received: 31 July 2011
Revised: 23 November 2011
Accepted manuscript online:

PACS:	34.50.Lf	(Chemical reactions)
	42.70.-a	(Optical materials)
	89.20.-a	(Interdisciplinary applications of physics)

Fund: Project supported by the National Natural Science Foundation of China(Grant No.20876125),the Research Fund for the Doctoral Program of Higher Education,China(Grant No.20096101110013),and the Northwest University Graduate Interdisciplinary Funds,China(Grant Nos.09YJC24 and 09YJC27)

Corresponding Authors: Fan Jun, E-mail:fanjun@nwu.edu.cn
E-mail: fanjun@nwu.edu.cn

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Liu En-Zhou(刘恩周), Fan Jun(樊君), Hu Xiao-Yun(胡晓云), Hou Wen-Qian(侯文倩), and Dai Hong-Zhe(代宏哲) 10BaF₂:NaF, Na₃AlF₆/TiO₂ composite as a novel visible-light-driven photocatalyst based on upconversion emission 2012 Chin. Phys. B 21 043403

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10BaF2:NaF, Na3AlF6/TiO2 composite as a novel visible-light-driven photocatalyst based on upconversion emission

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10BaF₂:NaF, Na₃AlF₆/TiO₂ composite as a novel visible-light-driven photocatalyst based on upconversion emission