• 专利标题:   Preparation of graphene oxide used for preparing reduced graphene involves foaming squamous graphite powder using concentrated sulfuric acid, adding e.g. sulfate and potassium permanganate, heating, adding hydrogen peroxide, and heating.
  • 专利号:   CN110902674-A
  • 发明人:   LIU Y, SHUAI S, ZHAO C, HAO J
  • 专利权人:   UNIV CHINA ELECTRONIC SCI TECHNOLOGY
  • 国际专利分类:   C01B032/198
  • 专利详细信息:   CN110902674-A 24 Mar 2020 C01B-032/198 202031 Pages: 8 Chinese
  • 申请详细信息:   CN110902674-A CN11301331 17 Dec 2019
  • 优先权号:   CN11301331

▎ 摘  要

NOVELTY - Preparation of graphene oxide involves expansion-foaming squamous graphite powder using concentrated sulfuric acid as intercalation agent (a1) at room temperature, adding sulfate and phosphate respectively as intercalation agents (a2) and (a3), stirring for 12-48 hours to obtain mixed solution (A), slowly adding potassium permanganate as oxidizing agent to the mixed solution (A) for 15-45 minutes, heating to medium temperature of 25-50 degrees C, stirring for 4-10 hours, slowly adding hydrogen peroxide with concentration of 10-30% until no bubbles are formed, heating to 50 degrees C for 1-6 hours to obtain mixed solution (B), centrifugally washing to pH of 5.0-7.4 with 0.1-2 M hydrochloric acid aqueous solution and deionized water, and freeze-drying resultant precipitate. The molar ratio of sulfate and phosphate is 1:1-25:1. The mass ratio of graphite powder and intercalation agent (a1) is 1:1-1:550. The mass ratio of graphite powder and potassium permanganate is 1:1-1:10. USE - Preparation of graphene oxide used for preparing reduced graphene. ADVANTAGE - The method enables simple, economical and easy preparation high-quality graphene oxide having high oxidation degree and low defect density, with high productivity on large-scale.