Hydrothermal Synthesis of Graphene/Bi2WO6 Composite with High Adsorptivity and Photoactivity for Azo Dyes
Hydrothermal Synthesis of Graphene/Bi2WO6 Composite with High Adsorptivity and Photoactivity for Azo Dyes
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DOI：
10.1111/jace.12261
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发表时间：
2013-05
影响因子：
3.9
通讯作者：
Jiang Zhang;Zhenghong Huang;Yong-Xia Xu;F. Kang
中科院分区：
文献类型：
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作者：
Jiang Zhang;Zhenghong Huang;Yong-Xia Xu;F. Kang
以乙醇为还原剂，在160°C下水热还原24 h制备了石墨烯/Bi 2 WO 6复合材料。采用X射线衍射（XRD）、紫外-可见漫反射光谱、红外光谱、拉曼光谱、扫描电子显微镜、高分辨透射电子显微镜、N2吸附和光催化活性评价等方法对所制备的复合材料进行了表征。石墨烯/Bi 2 WO 6复合材料的有效电荷分离是由石墨烯的导电性引起的，这是最重要的因素。结果表明，石墨烯纳米片与Bi 2 WO 6纳米片之间形成了界面接触。石墨烯的引入大大提高了其对偶氮染料的吸附性能。位于石墨烯边缘的含氧官能团负责增强的吸附性。所制备的石墨烯/Bi 2 WO 6复合材料具有增强的光吸收从紫外到可见光区。此外，石墨烯的引入也会导致Bi 2 WO 6的晶粒尺寸更小，结晶度更低。结果表明，石墨烯/Bi 2 WO 6复合材料对偶氮染料具有较高的吸附性能和光催化活性。石墨烯/Bi 2 WO 6复合材料的高光催化活性被认为是石墨烯的引入引起的高吸附、高光吸收和高导电性的协同效应。
Graphene/Bi2WO6 composites have been synthesized by hydrothermal reduction at 160°C for 24 h using ethanol as the reducing agent. All as-prepared composites were characterized using X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy, FT-IR spectroscopy, Raman spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy, N2 adsorption, and photocatalytic activity evaluation. The effective charge separation of graphene/Bi2WO6 composites was caused by the electrical conduction of graphene which is the most important factor. The results have proved the formation of interfacial contact between graphene nanosheets and Bi2WO6 nanoplates. The adsorptivity for azo dyes was enhanced greatly with the introduction of graphene. The oxy-functional groups located at the edges of graphene were responsible for the enhanced adsorptivity. As-prepared graphene/Bi2WO6 composites exhibited enhanced light absorption from UV to visible-light region. In addition, the introduction of graphene would also result in smaller crystalline size and lower crystallinity of Bi2WO6. Graphene/Bi2WO6 composites containing an appropriate amount of graphene were proved to exhibit higher adsorptivities and photocatalytic activities for azo dyes. High photocatalytic activities of graphene/Bi2WO6 composites were considered to be the synergetic effects of high adsorption, high light absorption, and high electrical conduction induced by the introduction of graphene.