Water-solubility-driven separation of gases using graphene membrane

We investigate separation of gas-mixtures using a graphene membrane. By introducing a water slab between a gas-mixture and the graphene membrane, we show that the gas-mixture can be separated based on the water-solubility of the gas molecule. By considering various gas-mixtures we show that the separation ratio follows the water-solubility ratio of the gas molecules in the mixture. We also demonstrate the water-solubility-driven separation of gas-mixtures using a carbon nanotube, but we show that the graphene membrane provides higher selectivity ratio because of its single-atom thickness.