Thermally annealed polyimide-based mixed matrix membrane containing ZIF-67 decorated porous graphene oxide nanosheets with enhanced propylene/propane selectivity
Thermally annealed polyimide-based mixed matrix membrane containing ZIF-67 decorated porous graphene oxide nanosheets with enhanced propylene/propane selectivity
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DOI：
10.1016/j.memsci.2020.118019
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发表时间：
2020-05
影响因子：
9.5
通讯作者：
Farhad Moghadam;T. Lee;I. Park;H. Park
中科院分区：
文献类型：
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作者：
Farhad Moghadam;T. Lee;I. Park;H. Park
本工作提出了一种新型的基于热退火6 FDA-DAM的混合基质膜（MMM），其包含二维（2D）ZIF-67修饰的多孔氧化石墨烯纳米片（ZPGO 67），具有有希望的C3 H6/C3 H8传输性能。不同的表征技术，包括XRD，DSC，FTIR和荧光光谱，用于阐明可能的变化，通过热退火的MMM的物理化学性质和结构。还测量了不同温度下原始6 FDA-DAM和含有ZPGO 67的MMM的C3 H6/C3 H8吸附等温线。单一气体渗透数据表明，在聚酰亚胺基体中嵌入20重量%的ZPG 0 67填料在2巴和35 °C下将C3 H6渗透性从19.5 Barrer增加到58.8 Barrer。相应的热退火MMM不仅表现出高的C3 H6/C3 H8选择透过性，还表现出优异的抗增塑性。例如，在400 °C下热退火的MMM在2巴和35 °C下表现出17.8的C3 H6/C3 H8选择透过性，显著高于未退火的MMM所获得的选择透过性。该膜在5巴和50 °C下24小时也显示出稳定的C3 H6渗透性为18.2 Barrer，C3 H6/C3 H8选择渗透性为11.3。通过荧光光谱分析和玻璃化转变温度的测定，证明了热退火膜的高C3 H6/C3 H8选择透过性和良好的抗增塑性能主要归因于电荷转移复合物（CTC）的形成。
This work presents a new type of thermally annealed 6FDA-DAM-based mixed matrix membranes (MMMs) containing two-dimensional (2D) ZIF-67-decorated porous graphene oxide nanosheets (ZPGO67) with promising C3H6/C3H8transport properties. Different characterization techniques, including XRD, DSC, FTIR, and fluorescence spectroscopy, were used to elucidate possible changes in physicochemical properties and structure of MMMs through thermal annealing. C3H6/C3H8sorption isotherms for pristine 6FDA-DAM and MMM containing ZPGO67 were also measured at different temperatures. Single-gas permeation data indicated that embedding a 20 wt% ZPGO67 filler in the polyimide matrix increased C3H6permeability from 19.5 Barrer to 58.8 Barrer at 2 bar and 35 °C. The corresponding thermally annealed MMMs showed not only high C3H6/C3H8permselectivity also excellent resistance to plasticization. For instance, MMM thermally annealed at 400 °C presented C3H6/C3H8permselectivity of 17.8, at 2 bar and 35 °C, considerably higher than that obtained for the non-annealed MMM. This membrane also showed stable C3H6permeability of 18.2 Barrer and C3H6/C3H8permselectivity of 11.3 at 5 bar and 50 °C for 24 h. The high C3H6/C3H8permselectivity and good anti-plasticization behavior of thermally annealed membranes were mainly attributed to the formation of charge-transfer complexes (CTCs), as evidenced by fluorescence spectroscopy analysis and Tgmeasurement.