Method of preparing graphene by using supercritical CO2 assisted liquid phase stripping

• Main Authors: XIAO HANG, ZHU LIANGLIANG, LIU LIXI, CHEN XI
• Format: Patent
• Language: Chinese; English
• Published: 10.12.2019
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention relates to a method of preparing graphene by using supercritical CO2 assisted liquid phase stripping. The method comprises the steps that graphite powder and an organic solvent are evenly mixed and then added into a preheated reaction still, CO2 is introduced into the reaction still, continuous stirring is conducted, and a reaction starts to be conducted after the preset supercritical pressure is reached; and after the reaction is completed, the reaction still is cooled to be the CO2 critical point or below, the CO2 is discharged, a solution is taken out to be subjected to ultrasonic treatment and then centrifuged, then supernate is taken, and thus a graphene solution is obtained. The method is easy to operate, mild in condition and high in product quality, the CO2 is environmentally friendly and low in cost, and the using amount of the organic solvent is small; and therefore, the method is a technology, with actual application prospects, for producing the graphene in industrial and environmenta