{"title":"Synergistic interfacial interaction in polyetherimide/ZIF-7 mixed matrix membranes for enhanced H2/CO2 separation","authors":"","doi":"10.1016/j.micromeso.2024.113267","DOIUrl":null,"url":null,"abstract":"<div><p>Mixed matrix membranes (MMMs), consisting of a continuous polymer phase and a discontinuous molecular sieve phase, present a promising alternative to polymeric membranes for gas separations due to their advantages of high processability with outstanding separation efficiency. The suppression of sieve-in-a-cage and filler agglomerations, major challenges in existing MMMs, is systematically validated through a combination of polyimide and zeolitic imidazolate framework-7 (ZIF-7) nanofillers to enhance the H<sub>2</sub>/CO<sub>2</sub> separation performance. The polyetherimide (Ultem) exhibits excellent interfacial interaction with ZIF-7 nanofillers within the MMMs, enabling the accommodation of high ZIF-7 concentrations, up to 40 wt%, due to its hydrophobic nature. The Ultem/ZIF-7 (60/40 wt/wt) MMMs represent significant enhancements in both H<sub>2</sub> permeability and H<sub>2</sub>/CO<sub>2</sub> selectivity, showing increases of 35 % and 65 %, respectively, compared to the pristine Ultem membrane. Furthermore, the enhancement in the intrinsic H<sub>2</sub>/CO<sub>2</sub> separation performance of ZIF-7, estimated by the Maxwell equation, is likely attributed to the substantial rigidification of polymer chains in the vicinity of ZIF-7. Additionally, the difference in the activation energy of permeation for H<sub>2</sub> and CO<sub>2</sub> distinctly increases with ZIF-7 contents, highlighting the importance of the interfacial interaction in the separation performance of MMMs.</p></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":null,"pages":null},"PeriodicalIF":4.8000,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microporous and Mesoporous Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1387181124002890","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
Mixed matrix membranes (MMMs), consisting of a continuous polymer phase and a discontinuous molecular sieve phase, present a promising alternative to polymeric membranes for gas separations due to their advantages of high processability with outstanding separation efficiency. The suppression of sieve-in-a-cage and filler agglomerations, major challenges in existing MMMs, is systematically validated through a combination of polyimide and zeolitic imidazolate framework-7 (ZIF-7) nanofillers to enhance the H2/CO2 separation performance. The polyetherimide (Ultem) exhibits excellent interfacial interaction with ZIF-7 nanofillers within the MMMs, enabling the accommodation of high ZIF-7 concentrations, up to 40 wt%, due to its hydrophobic nature. The Ultem/ZIF-7 (60/40 wt/wt) MMMs represent significant enhancements in both H2 permeability and H2/CO2 selectivity, showing increases of 35 % and 65 %, respectively, compared to the pristine Ultem membrane. Furthermore, the enhancement in the intrinsic H2/CO2 separation performance of ZIF-7, estimated by the Maxwell equation, is likely attributed to the substantial rigidification of polymer chains in the vicinity of ZIF-7. Additionally, the difference in the activation energy of permeation for H2 and CO2 distinctly increases with ZIF-7 contents, highlighting the importance of the interfacial interaction in the separation performance of MMMs.
期刊介绍:
Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal.
Topics which are particularly of interest include:
All aspects of natural microporous and mesoporous solids
The synthesis of crystalline or amorphous porous materials
The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic
The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions
All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials
Adsorption (and other separation techniques) using microporous or mesoporous adsorbents
Catalysis by microporous and mesoporous materials
Host/guest interactions
Theoretical chemistry and modelling of host/guest interactions
All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.