Hydrothermal synthesis and photocatalytic properties of tantalum pentoxide nanorods

doi:10.1016/S1872-2067(14)60215-1

Abstract

Abstract:

Tantalum pentoxide (Ta₂O₅) nanorods were hydrothermally synthesized using polyethylene glycol (PEG) as a guiding agent. The nanorods were characterized by X-ray diffraction, scanning and transmission electron microscopies, and diffuse reflectance ultraviolet-visible and photoluminescence spectroscopies. The effects of crystallization duration and Ta₂O₅/Sr(OH)₂ ratio on the product morphology were investigated, and a growth mechanism was proposed. Phase-pure Ta₂O₅ nanorods with controlled morphology were formed in the presence of PEG and Sr(OH)₂, which was necessary to form the nanorods. Sr(OH)₂ induced the surface dissolution and re-growth of Ta₂O₅. PEG induced the anisotropic growth of Ta₂O₅ by acting as a capping agent. The products were used to photocatalytically degrade rhodamine B under ultraviolet irradiation. The catalytic activity directly correlated with the length-diameter ratio of the Ta₂O₅ nanorods. A maximum apparent reaction rate constant of 0.156 min^-1 was obtained. The Ta₂O₅ nanorods were stable during photocatalytic reaction and could be recycled several times without loss of activity.

Key words: Tantalum pentoxide, Nanostructure, Crystal growth, Photocatalytic property, Anisotropic growth

Juxia Li, Weili Dai, Junqing Yan, Guangjun Wu, Landong Li, Naijia Guan. Hydrothermal synthesis and photocatalytic properties of tantalum pentoxide nanorods[J]. Chinese Journal of Catalysis, 2015, 36(3): 432-438.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60215-1

https://www.cjcatal.com/EN/Y2015/V36/I3/432

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