Preparation and characterizations of BiVO4/reduced graphene oxide nanocomposites with higher visible light reduction activities
Preparation and characterizations of BiVO4/reduced graphene oxide nanocomposites with higher visible light reduction activities
复制标题
具有较高可见光还原活性的BiVO4/还原氧化石墨烯纳米复合材料的制备及表征
DOI：
10.1016/j.jcis.2015.01.017
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发表时间：
2015-05-01
影响因子：
9.9
通讯作者：
Wu, Wei
中科院分区：
文献类型：
--
作者：
Wang, Aolan;Shen, Song;Wu, Wei
以氧化石墨、Bi（NO3）（3）和NH 4VO 3为前驱体，采用一步水热法制备了钒酸铋/还原氧化石墨烯（BiVO 4/RGO）复合材料。采用X射线衍射（XRD）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、拉曼光谱（Raman）、紫外-可见光谱（UV）、荧光光谱（FL）和电化学阻抗谱（EIS）等方法对复合材料进行了表征。还原后的氧化石墨烯片被蝴蝶状的BiVO 4片层修饰。这种结合不仅减轻了BiVO 4颗粒的团聚，而且抑制了还原氧化石墨烯的重新堆积。以合成的BiVO 4/RGO纳米复合材料为催化剂，在模拟太阳光照射下，对Cr（VI）和CO2的光还原进行了初步研究。纳米复合材料表现出更好的光催化活性比传统的BiVO 4颗粒。与纯BiVO 4相比，BiVO 4/RGO纳米复合材料的光还原效率提高了50.1%，乙醇产率提高了15.4 μ mol/g-cat。光催化活性的提高归因于光生电子从BiVO 4到RGO的有效电荷转移和吸收性能的改善。(C)2015 Elsevier Inc. All rights reserved.
Bismuth vanadate/reduced graphene oxide (BiVO4/RGO) composites were synthesized by one-step hydrothermal method with graphite oxide, Bi(NO3)(3) and NH4VO3 as precursors. The as-synthesized nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, UV-Vis spectroscopy (UV), fluorescence spectroscopy (FL) and electrochemical impedance spectroscopy (EIS). The reduced graphene oxide sheets were decorated by butterfly-like BiVO4 lamellas. Such combination not only alleviated the agglomeration of BiVO4 particles but also restrained the restacking of reduced graphene oxide. A preliminary study on the photo-reductions of Cr (VI) and CO2 under the illumination of simulated sunlight with as-synthesized BiVO4/RGO nanocomposites as catalyst was carried out. The nanocomposites showed better photo-catalytic activity than the conventional BiVO4 particles. The photo-reduction efficiency of BiVO4/RGO nanocomposites increased about 50.1% and the ethanol yield improved about 15.4 mu mol/g-cat comparing with pure BiVO4. The enhancements of the photo-catalytic activities were attributed to the effective charge transfer of photo-generated electron from BiVO4 to RGO and improved absorption performance. (C) 2015 Elsevier Inc. All rights reserved.