Volume 43 Issue 5
May  2018
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Sun Hongjuan, Liu Bo, Peng Tongjiang, Duan Jiaqi, 2018. Micromorphology and Structure Changes of Microcrystalline Graphite during Process of Oxidation and Expansion. Earth Science, 43(5): 1481-1488. doi: 10.3799/dqkx.2018.407
Citation: Sun Hongjuan, Liu Bo, Peng Tongjiang, Duan Jiaqi, 2018. Micromorphology and Structure Changes of Microcrystalline Graphite during Process of Oxidation and Expansion. Earth Science, 43(5): 1481-1488. doi: 10.3799/dqkx.2018.407

Micromorphology and Structure Changes of Microcrystalline Graphite during Process of Oxidation and Expansion

doi: 10.3799/dqkx.2018.407
  • Received Date: 2017-10-01
  • Publish Date: 2018-05-15
  • In order to reveal the structure changes of microcrystalline graphite in the process of oxidation and expansion, the products were characterized by means of SEM-EDS, XRD, Raman and FTIR in this study. The results show that the interlayer distance of microcrystalline graphite oxide is enlarged and many functional groups including hydroxyl, carboxyl and epoxy groups are bonded on the graphene layer in the oxidation process. In addition, with the increase of oxidant (KMnO4), the space distance, structural defects and disorder of oxidized product increased gradually. After being expanded with high temperature, some of the oxygen-containing functional groups in the structure were removed, and the oxidized microcrystalline graphite was reduced partly. In addition, the structural defects and disorder degrees of expanded microcrystalline graphite reduced, and local sp2 regions were recovered. The expanded microcrystalline graphite particles contained abundant network pore structures with pore sizes of 2-5 nm.

     

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