期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 267, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.118617
关键词
MMMs; UiO-66-PEI@pSBMA; CO2 permeability; CO2/CH4 separation
资金
- Central Guidance for Local Science and Technology Development Program [ZY17C10]
In this study, UiO-66-NH2 fillers were modified with PEI and pSBMA to prepare mixed matrix membranes (MMMs) with enhanced gas separation performance. The post-covalent modification strategy effectively eliminated interface defects and improved compatibility between the polymer matrix and filler particles, resulting in excellent gas separation performance in the MMMs.
In this study, UiO-66-NH2 fillers were grafted with polyethyleneimine (PEI) and poly(sulfobetaine methacrylate) (pSBMA) and subsequently incorporated into a sythesized 6FDA-ODA matrix to prepare mixed matrix membranes (MMMs). XRD, FTIR, SEM and TGA characterization techniques were used to evaluate the structure and properties of UiO-66-PEI@pSBMA and MMMs. It was found that the introduction of branched PEI and pSBMA can not only avoided the agglomeration of UiO-66-NH2, but also improved the compatibility between the polymer matrix and filler particles. In addition, the UiO-66-PEI@PSBMA was able to bond with a noticeable amount of amino groups and water molecules, and to promote the transportation of CO2 in the membrane. The resulting PI/UiO-66-PEI@pSBMA MMM achived remarkably enhanced gas perm-selectivity compared to pristine 6FDA-ODA membrane and exceeded the Robeson upper bound. The strategy of PEI and polyzwitterion post covalent modification for UiO-66-NH2 provides an effective way to eliminate interface defects and enhance the gas separation of MMMs.
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