Synthesis, Characterization, and Activity Evaluation of DyVO4/g-C3N4 Composites under Visible-Light Irradiation

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• 作者：Yiming He ; Jun Cai ; Tingting Li ; Ying Wu ; Yanmin Yi ; Mengfei Luo ; Leihong Zhao
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：November 14, 2012
• 年：2012
• 卷：51
• 期：45
• 页码：14729-14737
• 全文大小：527K
• 年卷期：v.51,no.45(November 14, 2012)
• ISSN：1520-5045

文摘

DyVO₄/graphitic carbon nitride (DyVO₄/g-C₃N₄) composite photocatalyst with visible-light response was prepared by a milling and heating treatment method. The synthesized powder was characterized by X-ray diffraction, thermogravimetry/differential thermal analysis, N₂ adsorption, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and UV鈥搗is diffuse reflection spectroscopy. The activity of composite photocatalyst DyVO₄/g-C₃N₄ for photodegradation of rhodamine B is much higher than that of either single-phase g-C₃N₄ or DyVO₄. The obviously increased performance of DyVO₄/g-C₃N₄ is mainly ascribed to the electron鈥揾ole separation enhancement at the interface of the two semiconductors, as proven by photoluminescence spectroscopy and photocurrent measurement. In addition, it is found that holes and ^{鈥?/sup>O₂鈥?/sup> are the main active species in the photocatalytic oxidation of RhB solution in the presence of DyVO₄/g-C₃N₄ composite.}