Graphene membrane film for solvent purification, method for producing same, and solvent purification system using same

A method for producing a graphene membrane film for solvent purification, the method comprising:

• preparing a graphene oxide dispersion liquid by dispersing graphene oxide in dispersion medium;
• confining the graphene oxide dispersion liquid between a pair of substrates;
• and
• applying heat and pressure to the graphene oxide dispersion liquid between the substrates to perform a hydrothermal reaction to concurrently thermally reduce the graphene oxide and bind graphenes.

A solvent purification system comprising:

• a filter housing provided with a graphene membrane film;
• and
• a pressure generator, wherein the pressure generator provides a pressure for purifying a solvent by allowing the solvent to pass through the graphene membrane film,
• wherein the filter housing comprises an inlet port configured to introduce a solvent before purification, an outlet port configured to discharge a solvent after purification, and a removal port configured to remove moisture and a hydrophilic component remaining during the purification of the solvent, and
• wherein the graphene membrane film comprises a plurality of stacked graphene plate-shaped flakes, wherein at least one pair of the plurality of stacked graphene plate-shaped flakes comprises a physical bond or a chemical bond connecting layers, a film having a thickness of about 1 nm to about 10 μm, wherein the film has a carbon/oxygen weight ratio (C/O ratio, unit:wt % of carbon/wt % of oxygen) of about 3 to about 99.9, and a d-spacing between the at least one pair of stacked graphene plate-shaped flakes is in a range of about 1 Å to about 10 Å.