Synthesis, characterization and photocatalytic performance of rod-shaped Pt/PbWO4 composite microcrystals

doi:10.1016/S1872-2067(15)61009-9

Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (12): 2178-2185.DOI: 10.1016/S1872-2067(15)61009-9

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Synthesis, characterization and photocatalytic performance of rod-shaped Pt/PbWO₄ composite microcrystals

Changlin Yu^a, Yu Bai^a, Hongbo He^a, Wenhong Fan^b, Lihua Zhu^a, Wanqin Zhou^a,c

a School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China;
b Department of Environmental Science and Engineering, School of Chemistry and Environment, Beihang University, Beijing 100191, China;
c State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, Fujian, China

Received:2015-08-15 Revised:2015-11-04 Online:2015-12-02 Published:2015-12-07
Supported by:
This work was supported by the National Natural Science Foundation of China (21067004, 21567008, 21263005), Project of Jiangxi Province Natural Science Foundation China (20133BAB21003), Training Programs of Innovation and Entrepreneurship for Undergraduates of Jiangxi Province (201310407046), The Landing Project of Science and Technology of Colleges and Universities in Jiangxi Province (KJLD14046), and Young Scientist Training Project of Jiangxi Province (20122BCB23015), Yuanhang Engineering of Jiangxi Province.

Abstract

Abstract:

Rod-shaped PbWO₄ microcrystals of length >1 μm were fabricated by a hydrothermal route and subsequent calcination. Pt nanoparticles (NPs) of different contents (0.5 wt%, 1 wt% and 2 wt%) were subsequently deposited on the PbWO₄ microcrystals, producing robust Pt/PbWO₄ composite microcrystals. The PbWO₄ microcrystals and Pt/PbWO₄ photocatalysts were characterized by X-ray diffraction, N₂ sorption measurements, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron, photoluminescence, Fourier-transform infrared, and ultraviolet-visible diffuse reflectance spectroscopies. The photocatalytic performances of the catalysts were evaluated by the consecutive photocatalytic degradation of acid orange II dye. The Pt/PbWO₄ composite microcrystals exhibited high photocatalytic activity and stability. The deposition of Pt NPs produced surface plasmon resonance (SPR), which induced a large visible light absorption. A Pt NP content of 1-2 wt% resulted in an ~2 times increase in photocatalytic activity, compared with the activity of Pt/PbWO₄. The crystal structure and high crystallinity of PbWO₄ resulted in its favorable photocatalytic property, and the SPR effect of the Pt NPs promoted visible light harvesting. The Pt NPs also enhanced the separation of photo-generated electrons and holes, which further promoted the photocatalytic reaction.

Key words: Rod-shaped, Lead tungstate microcrystals, Platium nanoparticles, Photocatalytic activity, Photocatalytic stability, Surface plasma, Electron-hole separation

Changlin Yu, Yu Bai, Hongbo He, Wenhong Fan, Lihua Zhu, Wanqin Zhou . Synthesis, characterization and photocatalytic performance of rod-shaped Pt/PbWO₄ composite microcrystals[J]. Chinese Journal of Catalysis, 2015, 36(12): 2178-2185.

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Synthesis, characterization and photocatalytic performance of rod-shaped Pt/PbWO₄ composite microcrystals

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