Composite separation membrane including coating layer of graphene oxide/bile acid or salt thereof and method for manufacturing the same

摘要

The present invention relates to a composite separation membrane that is applicable to carbon dioxide separation and recovery processes. The composite separation membrane includes a coating layer composed of graphene oxide and a bile acid or its salt on a porous polymer support. The composite separation membrane of the present invention, which includes a coating layer composed of graphene oxide and a bile acid or its salt, has both high carbon dioxide permeability and high selectivity for carbon dioxide over nitrogen, hydrogen or methane gas, is free of surface defects, and maintains a stable structure without deterioration of its performance even after long-term use. Due to these advantages, the composite separation membrane of the present invention can be applied to industrial fields involving carbon dioxide separation and recovery processes. The present invention also relates to a method for manufacturing the composite separation membrane.