双金属沸石咪唑酸酯骨架基混合基质膜的制备及CO_(2)/N_(2)分离性能研究

Preparation of mixed matrix membrane based on PEBA/Cu-Zn-ZIF and its performance in separation of CO_(2)/N_(2)

以Cu^(2+)、Zn^(2+)为配位金属,合成了双金属沸石咪唑酸酯骨架纳米粒子Cu-Zn-ZIF。将其与聚醚嵌段共聚酰胺(PEBA2533)共混,制备了混合基质膜PEBA/Cu-Zn-ZIF,用于CO_(2)/N_(2)分离。实验结果表明,随Cu-Zn-ZIF纳米粒子的加入,混合基质膜的CO_(2)渗透性能大幅增加,而CO_(2)/N_(2)选择性则先增加后降低。当Cu-Zn-ZIF添加量为15%时,混合基质膜的CO_(2)渗透性能达到320Barrer,CO_(2)/N_(2)选择性能达到47,比相同添加量下的PEBA/ZIF-8混合基质膜分别提高了36%和38%,接近Robeson分离上限。

Bimetallic zeolitic imidazolate framework nanoparticles(Cu-Zn-ZIF)were synthesized with Cu^(2+) and Zn^(2+) as coordination metals and embedded into polyether block amide(PEBA2533)to prepare a mixed matrix membranes PEBA/Cu-Zn-ZIF for CO_(2)/N_(2) separation.The results shown that:with the increasing of Cu-Zn-ZIF nanoparticles content in the membranes,the CO_(2) permeability increased dramatically,while the CO_(2)/N_(2) selectivity rosed firstly and then descended.When the addition amount of Cu-Zn-ZIF was 15%,the CO_(2) permeability and the CO_(2)/N_(2) 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.