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Acta Phys. -Chim. Sin.  2015, Vol. 31 Issue (1): 159-165    DOI: 10.3866/PKU.WHXB201411201
CATALYSIS AND SURFACE SCIENCE     
Effect of K+ Doping on the Band Structure and Photocatalytic Performance of Graphitic Carbon Nitride Photocatalysts
ZHANG Jian, WANG Yan-Juan, HU Shao-Zheng
Division of Chemistry, Chemical Engineering and Environment, Liaoning Shihua University, Fushun 113001, Liaoning Province, P. R. China
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Abstract  

Aseries of band gap-tunable K+ doped graphitic carbon nitride (g-C3N4) photocatalysts have been prepared using potassiumhydrate and melamine as precursors, and fully characterized by X-ray diffraction (XRD), UV-Vis spectroscopy, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), Fourier transform infrared (FTIR) spectroscopy, N2 adsorption, photoluminescence (PL), and X-ray photoelectron spectroscopy (XPS). The results of these analyses indicated that the positions of the valence and conduction bands were obviously changed as the concentration of K+ increased. The K+ ions were found to be embedded in the structural units of the g-C3N4, which inhibited the growth of the graphitic carbon nitride crystals, enhanced the surface area, and increased the separation rate of the photogenerated electrons and holes. The activity of K+ doped g-C3N4 catalysts was tested towards the photocatalytic degradation of rhodamine B (RhB) under visible light irradiation. The result indicated that the activity improved significantly after K+ doping. Furthermore, the K+ doped g-C3N4 catalysts exhibited outstanding structural and catalytic stability.



Key wordsGraphitic carbon nitride      Tunable band      K+ doping      Stability      Visible light     
Received: 24 September 2014      Published: 20 November 2014
MSC2000:  O643  
  O641  
  O649  
Fund:  

The project was supported by the Education Department of Liaoning Province, China (L2013150).

Corresponding Authors: HU Shao-Zheng     E-mail: hushaozheng001@163.com
Cite this article:

ZHANG Jian, WANG Yan-Juan, HU Shao-Zheng. Effect of K+ Doping on the Band Structure and Photocatalytic Performance of Graphitic Carbon Nitride Photocatalysts. Acta Phys. -Chim. Sin., 2015, 31(1): 159-165.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201411201     OR     http://www.whxb.pku.edu.cn/Y2015/V31/I1/159

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