▎ 摘　　要

NOVELTY - A membrane comprises a porous support (120), and a composite (110) comprising a graphene oxide compound and an ammonium salt polymer, and has a high moisture permeability and low gas permeability. The composite is coated on the support. USE - Membrane is used for dehydration of gas (claimed) e.g. nitrogen, oxygen, and compressed air, in energy recovery ventilator application. Uses include but are not limited to chemical, pharmaceutical, food and electronic industries. ADVANTAGE - The membrane has high moisture permeability and low gas permeability, and suppressed generation of swelling due to the presence of the graphene oxide composite, and can be manufactured by environmentally-friendly and economical process, and enables efficient, simple, and rapid dehydration of gas with high processing capacity and excellent selectivity, and reduced energy consumption. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) method of dehydrating gas; and (2) manufacture of membrane. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a nanocomposite membrane device. Selectively permeable device (100) Composite (110) Porous support (120)