Facilitated transport behavior of humidified gases through thin-film composite polyamide membranes for carbon dioxide capture

Abstract

In this work, commercial nanofiltration membranes from the water treatment industry have been shown to give good performance in a carbon dioxide capture application. Permeation of humidified gases through the membrane showed a carbon dioxide permeance of up to 340. GPU and a selectivity of 50, although the performance of a dry membrane with dry gas was significantly lower (6-8. GPU). The permeance of carbon dioxide was dependent on the temperature, pressure and pH of the water used to condition the membranes. The results indicate that a facilitated transport mechanism is dominant when humidified gases are present, probably due to the presence of piperazine functional groups and free amine wi..