A facile method for synthesis of graphene-coated hexagonal ZnO photocatalyst with enhanced photodegradation activity

1st International Conference on Frontiers of Materials Synthesis and Processing

材料科学;化学

Zhang, Yunlong^1,2 ; Zhang, Yuzhi^2

University of Chinese Academy of Sciences, Beijing

100049, China^1

Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai

200050, China^2

关键词: Core/shell structure;    N-methyl-2-pyrrolidone;    Photocatalytic activities;    Photodegradation activity;    Photodegradation rate;    Photoluminescence intensities;    UV-visible diffuse reflectance spectroscopy;    Zno/graphene composites;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/274/1/012157/pdf
DOI  :  10.1088/1757-899X/274/1/012157

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A kind of hexagonal ZnO (HZO) was synthesized in N-methyl-2-pyrrolidone (NMP)/H2O mixed solvent for a high exposure of polar ±(0001) facets to get a high-efficiency photocatalyst. The amine-functionalized HZO particles were coated with graphene oxide (GO) by electrostatic force-induced self-assemby and thermal reduction to form HZO@Gr core/shell structure. The as-prepared HZO and HZO@Gr were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and UV-visible diffuse reflectance spectroscopy (UV-vis/DRS). The results indicate that the graphene on HZO@Gr remains high quality and the optical properties of the composite change a lot with sunlight absorption improving, bandgap and photoluminescence (PL) intensity decreasing. The obtained HZO photocatalyst shows good photocatalytic activity for methylene blue (MB) under UV-visible irradiation. Furthermore, the HZO@Gr photocatalyst exhibits the best photodegradation rate of MB reaching up to 98.2% within 50 minutes. The graphene-coated HZO structure could offer new directions which would further extend the scope for synthesis of various ZnO/graphene composites with improved properties useful for various applications.