Efficient degradation of RhB over GdVO4/g-C3N4 composites under visible-light irradiation
Efficient degradation of RhB over GdVO4/g-C3N4 composites under visible-light irradiation
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GdVO4/g-C3N4 复合材料在可见光照射下高效降解 RhB
DOI：
10.1016/j.cej.2012.11.074
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发表时间：
2013-01-15
影响因子：
15.1
通讯作者：
Luo, Mengfei
中科院分区：
文献类型：
--
作者：
He, Yiming;Cai, Jun;Luo, Mengfei
采用球磨加热法制备了GdVO 4/g-C3 N4复合光催化剂。采用X射线衍射（XRD）、热重-差热分析（TG-DTA）、傅里叶变换红外光谱（FT-IR）、扫描电镜（SEM）、透射电镜（TEM）和紫外-可见漫反射光谱（DRS）等手段对样品进行了表征。以罗丹明B水溶液为降解对象，考察了其光催化活性。结果表明，g-C3 N4和GdVO 4具有合适的带电位，在两种半导体的异质结界面上引起电荷转移。GdVO_4/g-C_3 N_4复合材料的光催化活性得到提高。10重量% GdVO_4/g-C_3 N_4复合材料的光催化活性最高，降解速率为0.0434min（-1），是纯g-C_3 N_4的3.1倍多。通过光致发光（PL）光谱、光电流-时间测量和羟基自由基捕获测量，进一步证实了GdVO 4/g-C3 N4复合材料可见光催化活性增强的机理。(C)2012爱思唯尔有限公司版权所有。
GdVO4/g-C3N4 composite photocatalysts were synthesized by a milling and heating method. The samples were characterized by X-ray diffraction (XRD), thermogravimetry and differential thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV-vis diffuse reflection spectroscopy (DRS). The photocatalytic activities were evaluated in the degradation of rhodamine B aqueous solution. The result shows that g-C3N4 and GdVO4 present suitable band potentials, which induces a charge transfer at the heterojunction interfaces of the two semiconductors. The recombination of photogenerated electron-hole pairs is thus retarded and, consequently, the photocatalytic activity of GdVO4/g-C3N4 composites is enhanced. The 10 wt.% GdVO4/g-C3N4 composite presents the highest photocatalytic activity of with a degradation rate of 0.0434 min(-1), which exceeded that of pure g-C3N4 by more than 3.1 times. The proposed mechanism for the enhanced visible-light photocatalytic activity of GdVO4/g-C3N4 composites was further proven by photoluminescence (PL) spectroscopy, photocurrent-time measurement, and hydroxyl radicals trapping measurement. (C) 2012 Elsevier B.V. All rights reserved.