• 专利标题:   Separating and purifying graphene comprises e.g. taking biomass carbon or resin-modified asphalt and heating with oxygen to obtain graphene-containing mixture, and taking mixture in solvent to separate graphene by liquid phase separation.
  • 专利号:   CN111137880-A
  • 发明人:   HU Y, WU L, ZHANG J, LIU Y, YANG X
  • 专利权人:   UNIV WUHAN SCI TECHNOLOGY
  • 国际专利分类:   C01B032/184, C01B032/196
  • 专利详细信息:   CN111137880-A 12 May 2020 C01B-032/196 202044 Pages: 8 Chinese
  • 申请详细信息:   CN111137880-A CN11311672 18 Dec 2019
  • 优先权号:   CN11311672

▎ 摘  要

NOVELTY - Separating and purifying graphene comprises taking biomass carbon or resin-modified asphalt at 1300-1350 degrees C and heating with oxygen to obtain a graphene-containing mixture, and taking the mixture in a solvent to separate 1-15 layers of graphene by liquid phase separation. The specific steps comprises (i) grinding the mixture into particles with a mesh number of not less than 3000 mesh, adding the particles to the solvent, adding disodium edetate, and stirring and uniformly mixing to obtain a mixed solution, (ii) taking ultrasonic vibration of the mixed solution for 20-180 minutes, and performing centrifugal separation, controlling the centrifugal rotation speed to 1000-8000 revolution/minutes, where the centrifugation time is 10-60 minutes, and collecting the diluted graphite suspension, and (iii) repeating the step (ii) at least once, filtering treatment, and obtaining the graphene after drying the filter material. USE - The method is useful for separating and purifying grapheme. ADVANTAGE - The method: has high recovery rate; and ensures that the purity of graphene is relatively high.