Journal of Radiation Research and Radiation Processing ›› 2020, Vol. 38 ›› Issue (2): 1-8.doi: 10.11889/j.1000-3436.2020.rrj.38.020201

• RADIATION CHEMISTRY •     Next Articles

Synthesis of graphene/silver aerogel composites via gamma ray irradiation and its catalytic ability for 4-nitrophenol

LU Manli1,2,LI Jihao1(),LI Linfan1,LIN Jun1,JIANG Haiqing1,LI jingye1,3   

  1. 1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2.University of Chinese Academy of Sciences, Beijing 100049, China
    3.Shanghai Normal University, Shanghai 200234, China
  • Received:2019-11-19 Revised:2019-12-18 Accepted:2019-12-18 Online:2020-04-20 Published:2020-04-22
  • Contact: LI Jihao E-mail:lijihao@sinap.ac.cn
  • About author:LU Manli (female) was born in April 1992,and graduated from Henan Normal University in 2017. Now she is a graduate student at University of Chinese Academy of Sciences, majoring in radiation chemistry
  • Supported by:
    National Natural Science Foundation of China(11505270)

Abstract:

In an ethanol/water system and N2 atmosphere, graphene oxide and the silver ions were simultaneously reduced by a one-step gamma ray irradiation method and self-assembled into graphene/silver (GH/Ag) composite porous hydrogel materials with a three-dimensional structure. GA/Ag composite porous aerogels were obtained by the freeze-drying method. Scanning electron microscopy observed that GA/Ag composites have a honeycomb-like network structure. Transmission electron microscopy analysis revealed that silver nanoparticles have a size range of 20~60 nm. The results of X-ray photoelectron spectroscopy, X-ray diffraction and thermogravimetric analysis showed that the C element content in the GA/Ag composites increased, the O element content decreased, and Ag+ was reduced and thermal stability increased. Due to the synergistic catalysis between graphene and Ag nanoparticles, GA/Ag composites demonstrated excellent catalytic performance and catalyzed the concentration of 4-nitrophenol up to 2.16×10-3 mol/L. When the concentration of 4-nitrophenol was 0.72×10-3 mol/L, the first-order kinetic constant k was 1.53 min-1, which was higher than those synthesized by chemical methods.

Key words: Gamma ray irradiation method, Graphene oxide, Silver nanoparticles, Reduction and self-assembly, Three-dimensional structure, Synergistic catalysis

CLC Number: 

  • TL13