Figure 5. Photoswitchable membrane separation.

The separation of H₂:CO₂ and N₂:CO₂ mixtures is shown in (a,b), respectively. The membrane is irradiated by light of 365 and 455 nm for 5 min each. The permeances of H₂ and CO₂ (a), as well as N₂ and CO₂ (b) are shown as black solid squares and black open squares, respectively, with the logarithmic scale on the right-hand side. The molecular selectivities (or separation factors) are shown as red spheres with the scale on the left-hand side.