Key Laboratory of Jiangxi Province for Ecological Diagnosis, Remediation and Pollution Control, School of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Chemistry. 2012 Nov 5;18(45):14359-66. doi: 10.1002/chem.201200892. Epub 2012 Sep 20.
Herein, a chemically bonded BiOBr-graphene composite (BiOBr-RG) 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 BiOBr-RG as compared with pure BiOBr under visible light (λ>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 BiOBr-RG, and the high migration efficiency of photoinduced electrons, which may effectively suppress the charge recombination.
本文通过在氧化石墨烯存在下的简便原位溶剂热法制备了化学键合的 BiOBr-石墨烯复合材料（BiOBr-RG）。在溶剂热条件下，氧化石墨烯很容易被还原为石墨烯，同时纯四方相的 BiOBr 纳米板均匀地生长在石墨烯表面上。所得材料的结构和光电化学性质通过透射电子显微镜（TEM）、X 射线衍射（XRD）、傅里叶变换红外（FTIR）光谱、拉曼光谱、X 射线光电子能谱（XPS）和阻抗及光电流作用测量进行了表征。BiOBr 和石墨烯的结合将石墨烯的一些性质引入到光催化反应中，例如优异的导电性、吸附性和可控性。与纯 BiOBr 相比，所制备的 BiOBr-RG 在可见光（λ>420nm）下对罗丹明 B（RhB）的降解表现出显著的三倍增强。增强的光催化活性可归因于染料的高吸附性、光响应范围的扩展、BiOBr-RG 的费米能级的负移以及光生电子的高迁移效率，这可能有效地抑制了电荷复合。
