Pebax/UiO-66-NH2 mixed matrix membranes is prepared by using N,N-dimethylformamide(DMF)and formic acid respectively as sol vents.The gas separation performance of the membrane is tested by the constant volume and variable pressure method.It is shown that compared with pure membrane,the CO2 permeability of the membranes prepared with DMF as solvent decreases slightly with the addition of filler,but the CO2/N2 selectivity increases greatly.The CO2 permeability of the membranes prepared with formic acid as solvent greatly increases,but the CO2/N2 selectivity rises slightly.The CO2 permeability and CO2/N2 selectivity of the membrane cast in DMF with 2.5 wt%UiO-66-NH2 are 126.4 Barrer and 94.4,respectively at 25℃ and 1.0 MPa.With 7.5 wt%UiO-66-NH2,the CO2 permeability and CO2/N2 selectivity of the membrane cast in formic acid are 103.5 Barrer and 104.3,respectively at 25℃ and 0.6 MPa.
关键词
气体分离/混合基质膜/UiO-66-NH2/Pebax-1657/聚合物溶解
Key words
gas separation/mixed matrix membranes/UiO-66-NH2/Pebax-1657/dissolution of polymer