Bimetallic zeolitic imidazolate framework nanoparticles(Cu-Zn-ZIF)were synthesized with Cu2+ and Zn2+ as coordination metals and embedded into polyether block amide (PEBA2533) to prepare a mixed matrix membranes PEBA/Cu-Zn-ZIF for CO2/N2 separation.The results shown that:with the increasing of Cu-Zn-ZIF nanoparticles content in the membranes,the CO2 permeability increased dramatically,while the CO2/N2 selectivity rosed firstly and then descended.When the addition amount of Cu-Zn-ZIF was 15%,the CO2 permeability and the CO2/N2 selectivity of the mixed matrix membranes reached 320 Barrer and 47,respectively,which were 36% and 38% higher than that of the PEBA/ZIF-8 membrane with same nanoparticle content.This result was very close to the Robeson upper bound.
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基金资助
国家自然科学基金(22075107)
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