| 초록 |
Graphene oxide membrane has shown promise as a seawater desalination membrane, because of easy to fabricate by cost-effective manners such as spin-coating, spray-coating and vacuum filtration. However, several factors still remain to be elusive to adopt GOM in practical desalination. Primarily, graphene oxide can be split from GOM during filtration, due to interaction between oxygen functional groups and water. In addition, while the interlayer of GOM play a role as a molecule sieving barrier determining rejection rate in desalination, interlayer can be expanded by the swelling of water molecule, resulting in low rejection to small ions. Because the diameter of hydrated Na and Cl ions are nearly 7-8 A, controlling and retaining the interlayer of graphene oxide sheets with 9~10 A is required for high performance membrane. In this work, we suggest a way to elaborately controlling the interlayer of graphene sheets with multivalent ions, crosslinking the inter-plane of graphene sheets. |
