催化学报 ›› 2011, Vol. 32 ›› Issue (12): 1822-1830.DOI: 10.1016/S1872-2067(10)60286-0

• 研究论文 • 上一篇    下一篇

不同结构钽酸钠的制备及其光解水析氢性能

黄浪欢*, 产启中, 张斌, 吴晓婧, 高鹏, 焦自斌, 刘应亮   

  1. 暨南大学化学系, 广东广州 510632
  • 收稿日期:2011-07-29 修回日期:2011-09-13 出版日期:2011-12-21 发布日期:2015-04-23

Preparation of Sodium Tantalate with Different Structures and Its Photocatalytic Activity for H2 Evolution from Water Splitting

HUANG Langhuan*, CHAN Qizhong, ZHANG Bin, WU Xiaojing, GAO Peng, JIAO Zibin, LIU Yingliang   

  1. Department of Chemistry, Jinan University, Guangzhou 510632, Guangdong, China
  • Received:2011-07-29 Revised:2011-09-13 Online:2011-12-21 Published:2015-04-23

摘要: 采用不同钠源, 在水热条件下实现了钙钛矿结构 NaTaO3、烧绿石结构 Na2Ta2O6 以及 NaTaO3/Na2Ta2O6 异质结型复合光催化剂的可控合成, 利用 X 射线衍射、扫描电镜、高分辨透射电镜、紫外-可见漫反射光谱、荧光光谱和 X 射线光电子能谱对样品进行了表征, 探讨了钠源对所得钽酸钠样品结构的影响. 光解水析氢实验结果表明, 各钽酸盐的光催化活性顺序为 NaTaO3/Na2Ta2O6  > NaTaO3 > Na2Ta2O6 . NaTaO3 与 Na2Ta2O6  间形成的纳米尺度异质结有效抑制了光生电子和空穴的复合, 这是其具有最高光解水析氢活性的主要原因.

关键词: 光催化, 光解水, 钽酸钠, 异质结, 水热合成法

Abstract: Sodium tantalate photocatalysts with a perovskite structure (NaTaO3), a pyrochlore structure (Na2Ta2O6), and a nano-heterojunction (NaTaO3/Na2Ta2O6) structure were controllably synthesized using the hydrothermal method. Sodium carbonate, sodium stearate, and sodium acetate were used as precursors, respectively. The physical properties of the as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy, ultraviolet visible diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy. The effects of the sodium precursor on the structure of sodium tantalate are discussed. The photocatalytic results indicated that the activity for the H2 evolution half-reaction from water splitting was in the following order: NaTaO3/Na2Ta2O6 > NaTaO3 > Na2Ta2O6. The highest photocatalytic activity of NaTaO3/Na2Ta2O6 can be attributed to heterojunction formation within the nanoparticles, which significantly enhanced the separation of the electron-hole pairs.

Key words: photocatalysis, photocatalytic water splitting, sodium tantalate, heterojunction, hydrothermal synthesis