Fe掺杂g-C3N4的制备及其可见光催化性能

doi:10.3866/PKU.WHXB201406272

Abstract

Abstract:

A series of Fe-doped graphitic carbon nitride (g-C₃N₄) photocatalysts were prepared using ferric nitrate and melamine as precursors. X-ray diffraction (XRD), ultraviolet-visible (UV-Vis) spectroscopy, Fouriertransform infrared (FT-IR) spectroscopy, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), photoluminescence (PL) spectrum, and X-ray photoelectron spectroscopy (XPS) were used to identify changes in the characteristics caused by coordination of N atoms in the structural units of g-C₃N₄. The results indicate that embedded Fe³⁺ changed the optical properties, affected the energy band structure, and increased the electron/hole separation rate. The activities of the Fe³⁺-doped g-C₃N₄ catalysts were tested in the photocatalytic degradation of rhodamine B (RhB) under visible light. The degradation rate of RhB over Fe³⁺-doped g-C₃N₄ was 99.7% in 120 min. The rate constant for Fe³⁺-doped g-C₃N₄ was 3.2 times as high as that of pure g-C₃N₄. Disodium ethylenediamine tetraacetate, tert-butyl alcohol, and 1,4-benzoquinone were used as hole (h_VB⁺), hydroxyl radical (·OH), and superoxide radical (O₂^-·) scavengers, respectively, to investigate the possible mechanism.

Key words: Graphitic carbon nitride, Photocatalysis, Visible light, RhB degrdatiaon, Fe doping

JIN Rui-Rui, YOU Ji-Guang, ZHANG Qian, LIU Dan, HU Shao-Zheng, GUI Jian-Zhou. Preparation of Fe-Doped Graphitic Carbon Nitride with Enhanced Visible-Light Photocatalytic Activity[J]. Acta Phys. -Chim. Sin. 2014, 30(9), 1706-1712. doi: 10.3866/PKU.WHXB201406272

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Preparation of Fe-Doped Graphitic Carbon Nitride with Enhanced Visible-Light Photocatalytic Activity

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