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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >TiO_2-g-C_3N_4 composite materials for photocatalytic H_2 evolution under visible light irradiation
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TiO_2-g-C_3N_4 composite materials for photocatalytic H_2 evolution under visible light irradiation

机译：TiO_2-g-C_3N_4复合材料在可见光下光催化H_2析出

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摘要

In this investigation, we report the preparation of TiO_2-g-C_3N_4 composite materials with varying the wt.% of g-C_3N_4, the characterization of these materials by various techniques and photocatalytic hydrogen production under visible light irradiation in the presence of methanol. The X-ray powder diffraction (XRD) shows that the composite materials are consist of anatase TiO_2 and g-C_3N_4. Fourier transform infrared (FT-IR) spectra show that the absorbance band intensity of composite materials was stronger than that of C_3N_4. The UV-vis absorption spectra show that the absorption edge of the composite materials shifts to the lower energy region comparing to pure anatase and to longer wavelengths with increasing the amount of C3N4. The significant photoluminescence quenching was observed in TiO_2-C_3N_4 composite materials, indicating the charge transfer from C_3N_4 to TiO_2. The visible light induced H_2 evolution rate was remarkably enhanced by coupling TiO_2 with C_3N_4.
机译：在这项研究中，我们报告了制备具有变化的g-C_3N_4重量百分比的TiO_2-g-C_3N_4复合材料，通过各种技术表征这些材料以及在甲醇存在下在可见光照射下光催化制氢的方法。 X射线粉末衍射（XRD）表明复合材料由锐钛矿型TiO_2和g-C_3N_4组成。傅立叶红外光谱图表明，复合材料的吸收带强度比C_3N_4强。紫外可见吸收光谱表明，与纯锐钛矿相比，复合材料的吸收边缘移至较低的能量区域，而随着C3N4含量的增加，移至更长的波长。在TiO_2-C_3N_4复合材料中观察到明显的光致发光猝灭，表明电荷从C_3N_4转移到TiO_2。通过将TiO_2与C_3N_4偶合，可见光诱导的H_2析出速率明显提高。

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