物理化学学报 >> 2009, Vol. 25 >> Issue (06): 1107-1110.doi: 10.3866/PKU.WHXB20090624

研究论文 上一篇    下一篇

可见光下Fe3+掺杂对K2La2Ti3O10分解水制氢性能的影响

陈威, 董新法, 陈之善, 陈胜洲, 林维明   

  1. 华南理工大学化学与化工学院, 广东省绿色化学产品技术重点实验室, 广州 510640|广州大学化学化工学院, 广州 510006
  • 收稿日期:2009-02-20 修回日期:2009-03-20 发布日期:2009-06-05
  • 通讯作者: 董新法 E-mail:cexfdong@scut.edu.cn

Effect of Fe3+ Doping on Photocatalytic Activity of K2La2Ti3O10 for Water Decomposition to Hydrogen under Visible Light

CHEN Wei, DONG Xin-Fa, CHEN Zhi-Shan, CHEN Sheng-Zhou, LIN Wei-Ming   

  1. Guangdong Provincial Laboratory of Green Chemical Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China|School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
  • Received:2009-02-20 Revised:2009-03-20 Published:2009-06-05
  • Contact: DONG Xin-Fa E-mail:cexfdong@scut.edu.cn

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摘要：

采用溶胶-凝胶法制备了Fe3+掺杂的Fe-K2La2Ti3O10光催化剂, 并通过X射线衍射(XRD)、紫外-可见漫反射(DRS)、X射线光电子能谱(XPS)等技术对其进行了表征和分析, 考察了不同掺杂量对K2La2Ti3O10的性质及光催化分解水制氢活性的影响. 结果表明, Fe-K2La2Ti3O10在400-650 nm范围内显示强吸收, 光谱响应扩展到可见光区(λ>400 nm), 掺杂Fe3+后, K2La2Ti3O10的可见光区的光催化制氢活性显著提高, 掺杂量为nFe/nTi=0.04时活性最佳, 当催化剂用量为0.1 g, 反应液为CH3OH(30 mL)+H2O(90 mL)时, 产氢量达到1.92 μmol·h-1, 为未掺杂时的4倍.

关键词: 光催化, Fe3+掺杂, K2La2Ti3O10, 可见光, 水分解, 氢气

Abstract:

Undoped K2La2Ti3O10 and Fe3 + doped K2La2Ti3O10 samples were prepared by the sol-gel method and characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectra (DRS) and X-ray photoelectron spectroscopy (XPS). The effects of Fe3+ doping quantity on the properties and photocatalytic activity for hydrogen evolution were investigated. Results showed that Fe-doped K2La2Ti3O10 showed stronger absorption in the 400-650 nm range and this expanded to the visible light (λ>400 nm). Doping with Fe3+ raised the photocatalytic activity for hydrogen generation and the optimumamount of Fe3+ doping was found to be nFe/nTi=0.04. At this ratio and under visible light the rate of hydrogen evolution of Fe-K2La2Ti3O10 was 1.92 μmol·h-1 and this was 4 times higher than that of undoped K2La2Ti3O10 when 120 mL of reactive liquid (CH3OH(30 mL)+H2O(90 mL)) containing 0.1 g photocatalyst was used.

Key words: Photocatalysis, Fe3+-doped, K2La2Ti3O10, Visible light, Water decomposition, Hydrogen