五氧化二钽纳米柱的水热合成和光催化性能

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

催化学报 ›› 2015, Vol. 36 ›› Issue (3): 432-438.DOI: 10.1016/S1872-2067(14)60215-1

五氧化二钽纳米柱的水热合成和光催化性能

李菊霞, 戴卫理, 闫俊青, 武光军, 李兰冬, 关乃佳

南开大学化学学院先进能源材料化学教育部重点实验室, 天津300071

收稿日期:2014-07-24 修回日期:2014-08-29 出版日期:2015-02-14 发布日期:2015-02-14
通讯作者: 戴卫理, 关乃佳
基金资助:
天津化学化工协同创新中心.

Hydrothermal synthesis and photocatalytic properties of tantalum pentoxide nanorods

Juxia Li, Weili Dai, Junqing Yan, Guangjun Wu, Landong Li, Naijia Guan

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China

Received:2014-07-24 Revised:2014-08-29 Online:2015-02-14 Published:2015-02-14
Supported by:
This work was supported by the Collaborative Innovation Center of Chemical Science and Engineering (Tianjin).

摘要/Abstract

摘要：

以聚乙烯醇(PEG)为结构导向剂, 利用水热法合成了形貌可控的Ta₂O₅纳米柱.采用X射线衍射、扫描电镜、透射电镜、漫反射紫外-可见光谱和光致发光光谱对所制备样品进行了表征.考察了结晶时间和Ta₂O₅/Sr(OH)₂摩尔比等合成参数对样品形貌的影响, 并在此基础上对Ta₂O₅纳米粒可能的生长机理进行了推测.结果表明, 在PEG和Sr(OH)₂存在条件下可以合成形貌可控的Ta₂O₅纳米柱.研究了紫外光下Ta₂O₅纳米柱降解罗丹明B的光催化性能, 发现Ta₂O₅的形貌对光催化性能有很大影响, Ta₂O₅纳米柱的光催化性能与其长度和直径比成线性关系.催化降解反应的表观速率常数最高可达0.156 min^-1, 且经多次循环使用后, 样品仍然保持较高的催化性能.

关键词: 五氧化二钽, 纳米结构, 晶体生长, 光催化性质, 各向异性生长

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

李菊霞, 戴卫理, 闫俊青, 武光军, 李兰冬, 关乃佳 . 五氧化二钽纳米柱的水热合成和光催化性能[J]. 催化学报, 2015, 36(3): 432-438.

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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五氧化二钽纳米柱的水热合成和光催化性能

Hydrothermal synthesis and photocatalytic properties of tantalum pentoxide nanorods

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