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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Remarkably enhanced photocatalytic activity of ordered mesoporous carbon/g-C_3N_4 composite photocatalysts under visible light
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Remarkably enhanced photocatalytic activity of ordered mesoporous carbon/g-C_3N_4 composite photocatalysts under visible light

机译：可见光下有序介孔碳/ g-C_3N_4复合光催化剂的光催化活性显着增强

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摘要

Ordered mesoporous carbon/g-C_3N_4 (OMC/g-C_3N_4) composites with efficient photocatalytic activity under visible light irradiation were prepared by a facile heating method. The as-prepared OMC/g-C_3N_4 composites were thoroughly characterized by X-ray diffraction, Fourier transform infrared spectroscopy, elemental analyses, transmission electron microscopy with energy dispersion X-ray spectroscopy, N_2 adsorption–desorption analysis, UV-vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The photocatalytic activities were evaluated by degrading Rhodamine B dye, and OMC/ g-C_3N_4 composites exhibited much higher photocatalytic activities than pristine g-C_3N_4. Moreover, the catalysts retained good stability and the photodegradation efficiency hardly changed after five cycles. The degradation rate of the OMC/g-C_3N_4 photocatalyst was almost 10 times as high as that of the pristine g- C_3N_4, which indicated that OMC played an important role in the remarkable improvement of photocatalytic activity. The significant enhancement in photodegradation activity over the OMC/g-C_3N_4 catalyst could be ascribed to the combined effects coming from the enhanced visible light adsorption, enriched adsorption of the dye on the catalyst and subsequent efficient separation of photogenerated electrons and holes. In addition, a possible mechanism for the photodegradation process was proposed on the basis of active species scavenging experiments.
机译：通过简便的加热方法制备了在可见光下具有有效光催化活性的有序介孔碳/ g-C_3N_4（OMC / g-C_3N_4）复合材料。制备的OMC / g-C_3N_4复合材料通过X射线衍射，傅立叶变换红外光谱，元素分析，透射电子显微镜和能量色散X射线光谱，N_2吸附-解吸分析，UV-vis漫反射光谱进行了全面表征和光致发光光谱。通过降解罗丹明B染料评估了光催化活性，OMC / g-C_3N_4复合材料表现出比原始g-C_3N_4高得多的光催化活性。而且，催化剂保持了良好的稳定性，并且在五个循环后光降解效率几乎不变。 OMC / g-C_3N_4光催化剂的降解速率几乎是原始g-C_3N_4的10倍，这表明OMC在光催化活性的显着提高中起着重要作用。与OMC / g-C_3N_4催化剂相比，光降解活性的显着提高可归因于以下两种综合作用：增强的可见光吸附，染料在催化剂上的富集吸附以及随后对光生电子和空穴的有效分离。此外，在活性物种清除实验的基础上，提出了光降解过程的可能机理。

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