Separating CO2 from other gases and vapors for industrial applications,space travel as well as control of greenhouse is very important. No holes and glassy polymeric membrane has a relatively low CO2/CH4 and CO2/N2 selectivity, particularly when carbon dioxide content is low. Selectivity of CO2 in the water through the activation of primary amine and tertiary amine groups, taking G0 as the membrane liquid, will effectively promote the transport of CO2 and effectively prevent other gaseous substances transport. Weihai CY Dendrimer Technology Co. Ltd forwards from “Dendrimer Membranes: A CO2-Selective Molecular Gate” A. Sarma Kovvali, Hua Chen, and Kamalesh K. Sirkar  Department of Chemical Engineering Chemistry and EnVironmental Science  New Jersey Institute of Technology, Newark, New Jersey 07102  ReceiVed April 14, 2000