通过γ射线辐照合成3D石墨烯/Au复合材料及其用于催化还原4-硝基苯酚的研究
The synthesis of 3D graphene/Au composites via γ-ray irradiation and their use for catalytic reduction of 4-nitrophenol.
作者信息
Lu Manli, Li Jihao, Song Sanzhao, Li Linfan, Lin Jun, Zhang Bowu, Li Jingye
机构信息
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
出版信息
Nanotechnology. 2020 Mar 20;31(23):235604. doi: 10.1088/1361-6528/ab7aa5. Epub 2020 Feb 27.
Graphene oxide (GO) and gold ions (Au) can be simultaneously reduced and self-assembled into a three-dimensional (3D) graphene/Au composite (GA/Au) porous structure at room temperature via one-step γ-ray irradiation. The microstructure of GA/Au composites were observed under different magnifications and the pores were observed to be uniform 3D porous structure. In addition, Au nanoparticles were homogeneously attached to graphene sheets and had a typical diameter of 6 nm. These GA/Au composites were analyzed and characterized by x-ray diffraction analysis, x-ray photoelectron spectroscopy, and thermal gravity analysis. Due to synergistic catalysis between graphene and Au nanoparticles, GA/Au composites catalyzed 4-nitrophenol with excellent catalytic performance, even at concentrations up to 6.48 × 10 M. When the concentration of 4-nitrophenol was 2.16 × 10 M and 4.22 × 10 M, the first-order kinetic constants were 2.00 and 1.43 min, respectively.
氧化石墨烯（GO）和金离子（Au）可在室温下通过一步γ射线辐照同时被还原并自组装成三维（3D）石墨烯/金复合材料（GA/Au）多孔结构。在不同放大倍数下观察了GA/Au复合材料的微观结构，观察到孔隙为均匀的3D多孔结构。此外，金纳米颗粒均匀地附着在石墨烯片上，典型直径为6纳米。通过X射线衍射分析、X射线光电子能谱和热重分析对这些GA/Au复合材料进行了分析和表征。由于石墨烯和金纳米颗粒之间的协同催化作用，GA/Au复合材料催化对硝基苯酚具有优异的催化性能，即使在浓度高达6.48×10⁻³ M时也是如此。当对硝基苯酚的浓度为2.16×10⁻³ M和4.22×10⁻³ M时，一级动力学常数分别为2.00和1.43 min⁻¹。
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