TH22416U - Method for preparing graphene oxide with high oxygen functional groups. - Google Patents

Abstract

Page 1 of 1 Summary of the Invention: This invention provides a method for preparing graphene oxide that is simple and yields a graphene oxide product with a high oxygen content. The method for preparing graphene oxide comprises the following steps: a) mixing graphite powder, nitrate salt (NO3), and concentrated acid; b) adding permanganate salt (MnO4) to the mixture obtained in step a); c) washing and separating the graphene oxide precipitate from the mixture in step b; the specific feature is that step b) is carried out with continuous stirring for 0.5 to 3 hours at room temperature.

Claims (10)

1. Page 1 of 2 Claim 1. A method for preparing graphene oxide comprising steps a) mixing graphite powder, nitrate salt (NO3) and concentrated acid together, b) adding permanganate salt (MnO4) to the mixture obtained in step a), c) washing and separating the graphene oxide precipitate from the mixture in step b), characterized by step b) being carried out with continuous stirring for 0.5 to 3 h at room temperature. 2. A method for preparing graphene oxide according to claim 1, wherein the weight ratio of graphite powder: nitrate salt: concentrated acid in step a) is in the range of 1:0.4:40 to 1:0.6:45. 3. A method for preparing graphene oxide according to claim 1, wherein the weight ratio of graphite powder : permanganate salt in step b) is in the range of 1 : 3 to 1 : 9. 4. A method for preparing graphene oxide according to claim 1, wherein the concentrated acid in step a) can be chosen from concentrated sulfuric acid, concentrated nitric acid, or concentrated phosphoric acid. 5. A method for preparing graphene oxide according to claim 1, wherein the nitrate salt in step a) is sodium nitrate (NaNO3). 6. A method for preparing graphene oxide according to claim 1, wherein the permanganate salt in step b) is potassium permanganate (KMnO4). 7. A method for preparing graphene oxide according to claim 1, wherein step b) further comprises the step of further stirring the mixture, which can be selected from continuous stirring for 1 to 5 h at a temperature in the range of 30 to 40 °C, or continuous stirring of the mixture for 1 to 5 h at room temperature and then allowing the mixture to stand for 10 to 24 h. 8. A method for preparing graphene oxide according to claim 1 or 7, wherein step b) further comprises adding, optionally, a sufficient amount of excess hydrogen peroxide (H2O2) to the mixture obtained by step b), to be carried out in step c). Page 2 of 2. 9. A method for preparing graphene oxide according to claim 1, wherein the washing of the graphene oxide in step c) comprises the step of washing the graphene oxide precipitate obtained with water until the washing water has a pH value in the range of 5 to 8. 10. A method for preparing graphene oxide according to claim 1, wherein the separation of the graphene oxide in step c) separates the graphene oxide precipitate by a method optional of filtration or centrifugation.