Chitosan-graphene oxide membranes and process of making the same

A process for making a chitosan-graphene oxide composite membrane, said process comprising the steps of:

• selectively mixing graphene oxide with purified water, wherein said graphene oxide has a first flake size between about 80 nm and about 105 nm in diameter or a second flake size between about 0.3 μm and about 0.7 μm in diameter, wherein said first flake size produces said chitosan-graphene oxide composite membrane with a layered graphene oxide internal morphology structure and said second flake size produces said chitosan-graphene oxide composite membrane with a dispersed graphene oxide internal morphology structure;
• mixing chitosan with an acid;
• preparing a casting solution comprising said chitosan and said graphene oxide;
• evaporating said casting solution under reduced pressure to make said chitosan-graphene oxide composite membrane having said layered or said dispersed internal morphology structure.