Hybrid photocatalysts using graphitic carbon nitride/cadmium sulfide/reduced graphene oxide (g-C3N4/CdS/RGO) for superior photodegradation of organic pollutants under UV and visible light.
Hybrid photocatalysts using graphitic carbon nitride/cadmium sulfide/reduced graphene oxide (g-C3N4/CdS/RGO) for superior photodegradation of organic pollutants under UV and visible light.
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DOI：
10.1039/c4dt01278j
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发表时间：
2014-07
影响因子：
4
通讯作者：
R. C. Pawar;V. Khare;C. S. Lee
中科院分区：
文献类型：
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作者：
R. C. Pawar;V. Khare;C. S. Lee
采用简单的化学方法将石墨碳氮化物（g-C3 N4）与CdS纳米粒子和还原氧化石墨烯（RGO）片杂化，用于在紫外光和可见光照射下催化降解罗丹明B和刚果红染料。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）分析证实了纯g-C3 N4以及g-C3 N4/CdS、g-C3 N4/RGO和g-C3 N4/CdS/RGO复合材料的形成。g-C3 N4/CdS/RGO复合材料的大表面积（70.42 m2 g-1）导致染料快速吸附到光催化剂表面上，从而有效地光降解有机污染物。在可见光下，CdS和RGO的加入使g-C3 N4的光催化活性比市售的TiO 2催化剂提高了约20倍，并且发现g-C3 N4/CdS/RGO复合材料与纯g-C3 N4以及g-C3 N4/CdS和g-C3 N4/RGO复合材料相比显著增强了催化效果。g-C3 N4/CdS/RGO复合材料的上级光催化活性归因于光生电子-空穴对的分离增强以及可见光吸收增加。光电子传输的改善与瞬态光电流测量的结果一致。因此，g-C3 N4/CdS/RGO复合材料使用一个简单的方法是适用于开发高效率的光催化器件的工业应用。
Graphitic carbon nitride (g-C3N4) was hybridized with CdS nanoparticles and reduced graphene oxide (RGO) sheets using a facile chemical method, for the application of catalytic photodegradation of Rhodamine B and Congo red dyes under irradiation with UV and visible light. Fourier-transform infrared (FTIR) spectroscopy and X-ray photoemission spectroscopy (XPS) analyses confirmed the formation of pure g-C3N4, as well as g-C3N4/CdS, g-C3N4/RGO, and g-C3N4/CdS/RGO composites. The large surface area of the g-C3N4/CdS/RGO composite (70.42 m(2) g(-1)) resulted in rapid dye adsorption onto the surface of the photocatalyst, leading to effective photodegradation of organic pollutants. The addition of CdS and RGO increased the photocatalytic activity of g-C3N4 by a factor of approximately twenty compared with that of the commercially available TiO2 catalyst under visible light, and the g-C3N4/CdS/RGO composite was found to significantly enhance the catalytic effect compared with pure g-C3N4 and with the g-C3N4/CdS and g-C3N4/RGO composites. The superior photocatalytic activity of the g-C3N4/CdS/RGO composite is attributed to enhanced separation of the photogenerated electron-hole pairs, as well as increased visible-light absorption. The improved transport of photoelectrons was consistent with the results of transient photocurrent measurements. Therefore, g-C3N4/CdS/RGO composites using a facile method are applicable to the development of high-efficiency photocatalytic devices for industrial applications.