钾离子掺杂对石墨型氮化碳光催化剂能带结构及光催化性能的影响

doi:10.3866/PKU.WHXB201411201

Abstract

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 words: Graphitic carbon nitride, Tunable band, K⁺ doping, Stability, Visible light

ZHANG Jian, WANG Yan-Juan, HU Shao-Zheng. Effect of K⁺ Doping on the Band Structure and Photocatalytic Performance of Graphitic Carbon Nitride Photocatalysts[J]. Acta Phys. -Chim. Sin. 2015, 31(1), 159-165. doi: 10.3866/PKU.WHXB201411201

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Effect of K⁺ Doping on the Band Structure and Photocatalytic Performance of Graphitic Carbon Nitride Photocatalysts

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Effect of K⁺ Doping on the Band Structure and Photocatalytic Performance of Graphitic Carbon Nitride Photocatalysts