One-Pot Synthesis, Characterization, and Enhanced Photocatalytic Activity of a BiOBr-Graphene Composite
One-Pot Synthesis, Characterization, and Enhanced Photocatalytic Activity of a BiOBr-Graphene Composite
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BiOBr-石墨烯复合材料的一锅法合成、表征和增强的光催化活性
DOI：
10.1002/chem.201200892
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发表时间：
2012-11-01
影响因子：
4.3
通讯作者：
Li, Jinghong
中科院分区：
文献类型：
--
作者：
Tu, Xinman;Luo, Shenglian;Li, Jinghong
本论文以氧化石墨烯为催化剂，采用简便的原位溶剂热法制备了化学键合的生物溴化石墨烯复合材料。在溶剂热条件下，氧化石墨烯很容易还原为石墨烯，同时在石墨烯表面均匀地生长出纯四方相的BiOBr纳米片。通过透射电子显微镜、X射线衍射仪、傅立叶变换红外光谱、拉曼光谱、X射线光电子能谱、阻抗和光电流谱等测试手段对材料的结构和光电化学性能进行了表征。BiOBR与石墨烯的结合将石墨烯引入到光催化反应中，具有良好的导电性、吸附性能和可控性。在可见光(420 Nm)下，与纯BiOBR相比，BiOBrRG对罗丹明B(RhB)的降解能力显著提高3倍。光催化活性的提高归因于染料的吸附、光响应范围的扩大、BiOBrRG的费米能级负移以及光生电子的高迁移效率，从而有效地抑制了电荷复合。
Herein, a chemically bonded BiOBrgraphene composite (BiOBrRG) was prepared through a facile in situ solvothermal method in the presence of graphene oxide. Graphene oxide could be easily reduced to graphene under solvothermal conditions, and simultaneously BiOBr nanoplates with pure tetragonal phase were grown uniformly on the graphene surface. The structure and photoelectrochemical properties of the resulting materials were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and impedance and photocurrent action measurements. The combination of BiOBr and graphene introduces some properties of graphene into the photocatalysis reaction, such as excellent conductivity, adsorptivity, and controllability. A remarkable threefold enhancement in the degradation of rhodamine B (RhB) was observed with as-prepared BiOBrRG as compared with pure BiOBr under visible light (?>420 nm). The enhanced photocatalytic activity could be attributed to the great adsorptivity of dyes, the extended photoresponse range, the negative shift in the Fermi level of BiOBrRG, and the high migration efficiency of photoinduced electrons, which may effectively suppress the charge recombination.