Pebax-based mixed matrix membranes containing hollow polypyrrole nanospheres with mesoporous shells for enhanced gas permeation performance
Pebax-based mixed matrix membranes containing hollow polypyrrole nanospheres with mesoporous shells for enhanced gas permeation performance
复制标题
基于 Pebax 的混合基质膜，含有中空聚吡咯纳米球和介孔壳，可增强气体渗透性能
DOI：
10.1016/j.memsci.2020.117968
复制
发表时间：
2020
影响因子：
9.5
通讯作者：
Zhang Yuzhong
中科院分区：
文献类型：
--
作者：
Wang Xinlan;Ding Xiaoli;Zhao Hongyong;Fu Jiaxin;Xin Qingping;Zhang Yuzhong
混合基质膜（MMM）在克服Robeson权衡效应方面显示出巨大的优势，并且各种填料已被用于改善气体渗透和分离性能。本研究采用硬模板法通过化学聚合制备了具有介孔壳层的聚吡咯（PPy）空心纳米球。采用透射电镜、扫描电镜、Brunauer Emmett Teller和小角X射线散射等方法对具有介孔壳层的空心聚吡咯纳米球进行了表征。我们将空心PPy纳米球引入聚醚嵌段酰胺（Pebax 1657）中作为填料，制备了用于CO2分离的MMM。研究了空心聚吡咯纳米球对材料物理性能和气体渗透分离性能的影响。结果表明，空心聚吡咯纳米球的加入有助于提高透气性。当PPy空心纳米球的负载量为1wt%时，MMM表现出最高的CO2渗透率为274 Barrer，与纯Pebax膜相比增加了一倍多，同时CO2/N2选择性略有增加，为40.1，CO2/CH 4选择性略有增加，为12.8。具有中空聚合物纳米球的MMM显示出工业规模CO2分离的积极潜在应用。
Mixed matrix membranes (MMMs) have shown great advantages in overcoming the Robeson trade-off effect, and various fillers have been utilized to improve the gas permeation and separation performance. In this study, hollow polypyrrole (PPy) nanospheres with mesoporous shells were synthesized by chemical polymerization using hard template method. The hollow PPy nanospheres with mesoporous shells were investigated by transmission electron microscopy, scanning electron microscopy, Brunauer Emmett Teller and small-angle X-ray scattering. We introduced hollow PPy nanospheres into poly(ether-block-amide) (Pebax1657) as fillers to prepare MMMs for CO2separation. The effects of the hollow PPy nanospheres on the physical properties and the gas permeation and separation performance were studied. The results showed that the addition of hollow PPy nanospheres contributed to the improvement of the gas permeability. At 1 wt% loading of hollow PPy nanospheres, the MMMs exhibited a highest CO2permeability of 274 Barrer, which was more than double compared with that of the pure Pebax membrane, accompanied by the slightly increased CO2/N2selectivity of 40.1 and the slightly increased CO2/CH4selectivity of 12.8. MMMs with hollow polymer nanospheres display a positive potential application for industrial-scale CO2separation.