Preparation of Au/BiOBr/Graphene composite and its photocatalytic performance in phenol degradation under visible light
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摘要: 采用水热法和多巴胺还原法制备了BiOBr、BiOBr/石墨烯和Au/BiOBr/石墨烯光催化剂，并利用扫描电镜（SEM）、透射电镜（TEM）、X射线衍射（XRD）、光致发光光谱（PL）和紫外-可见漫反射光谱（UV-vis DRS）等方法表征其形貌、相结构、光谱吸收性质以及组成结构。在可见光照射下，通过对水相中苯酚的降解，考察了Au/BiOBr/石墨烯复合光催化剂活性。结果表明，由于量子效率的提高、带隙能的降低（2.25eV）以及Au表面等离子体共振，复合光催化剂表现出比纯BiOBr更高的光催化活性，Au/BiOBr/石墨烯复合物在180min内对苯酚降解率可达到64%。Abstract: BiOBr, BiOBr/Graphene and Au/BiOBr/Graphene composites were prepared by hydrothermal synthesis and dopamine in-situ reduction method; their morphology, composition, phase structure and optical absorption properties were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflection spectroscopy (DRS) and photoluminescence (PL) emission spectroscopy. The photocatalytic performance of Au/BiOBr/Graphene in phenol degradation under visible light was investigated. The results indicate that the Au/BiOBr/Graphene composite exhibits enhanced absorption in the visible light region as well as superior photocatalytic activity in the degradation of aqueous phenol, in comparison with BiOBr and BiOBr/Graphene, owing to the enhanced quantum efficiency, narrowed band gap (2.25eV) and surface plasmon resonance of Au nano particles. Over Au/BiOBr/Graphene composite, the degradation rate of phenol reaches 64% in 180min under visible light irradiation.
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Key words:
- BiOBr /
- graphene /
- gold /
- phenol /
- degradation /
- photocatalysis
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图 1 BiOBr、BiOBr/石墨烯和Au/BiOBr/石墨烯的XRD谱图
Figure 1 XRD patterns of BiOBr, BiOBr/Graphene and Au/BiOBr/Graphene
图 3 BiOBr (a)、BiOBr/石墨烯和Au/BiOBr/石墨烯的SEM照片，Au/BiOBr/石墨烯的TEM照片
Figure 3 SEM images of BiOBr (a), BiOBr/Graphene (b) and Au/BiOBr/Graphene (c); TEM image of Au/BiOBr/Graphene (d)
图 4 BiOBr、BiOBr/石墨烯和Au/BiOBr/石墨烯的光致发光光谱谱图
Figure 4 Photoluminescence spectra of BiOBr, BiOBr/Graphene and Au/BiOBr/Graphene
图 5 BiOBr、BiOBr/石墨烯和Au/BiOBr/石墨烯的紫外-可见漫反射光谱谱图
Figure 5 UV-Vis absorption spectra of BiOBr, BiOBr/Graphene and Au/BiOBr/Graphene
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