Fabrication of Zr-MOF filled PVA/CS blended membranes for high efficiency CO2 separation

In the present work, a series of PVA and CS blend membranes were studied. These prepared membranes were evaluated by binary mixture gases of CO 2 /N 2 and CO 2 /CH 4 . The optimum ratio of PVA/CS for CO 2 permeance was achieved at 5:5. It recorded a CO 2 permeability of 20.8 GPU (1 GPU = 1 × 10 -6 ·cm 3 (STP)·cm −2 ·s −1 ·cmHg −1 ) with CO 2 /N 2 selectivity of 89.7, as well as CO 2 permeability of 10.2 GPU and CO 2 /CH 4 selectivity of 56.3. Secondly, two kinds of nanoparticle UiO-66 and UiO-66-NH 2 were used to prepare mixed matrix membranes. The effects of nanofiller content and chemical groups on gas permselectivity were investigated. Results show that the addition of nanoparticles can effectively improve the permselectivity of membrane. The mixed matrix membranes addition with UiO-66-NH 2 achieved the optimum CO 2 performance and these were following the order of PVA(5)/CS(5)-UiO-66-NH 2  > PVA(5)/CS(5)-UiO-66 > PVA(5)/CS(5). For all these membranes, the permeance and selectivity present initial increased and then decreased. Mixed matrix membranes addition UiO-66-NH 2 (containing 3.75 wt%) exhibits a CO 2 permeance of 32.77 GPU and CO 2 /N 2 selectivity of 93.47, as well as CO 2 permeance of 25.57 GPU and CO 2 /CH 4 selectivity of 70.1, which was beyond the 2008 Robeson upper bound.