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An innovative approach for the preparation of confined ZIF-8 Membranes by conversion of ZnO ALD layers

Journal of Membrane Science
DOI: 10.1016/j.memsci.2014.10.011
  • Atomic Layer Deposition
  • Zno
  • Zif-8 Membrane
  • Nanocomposite Membrane
  • Confinement
  • Gas Separation
  • Chemistry


Abstract An innovative eco-friendly approach has been developed for the synthesis of ZIF-8-based nanocomposite membranes. The method involves the Atomic Layer Deposition (ALD) of ZnO thin films on the grains of a macroporous ceramic support and their subsequent conversion to ZIF-8 using a 2-methylimidazole/methanol solution and solvothermal conditions. Despite of applying extremely low quantity of chemicals, reproducible and good quality ZIF-8-based membranes have been obtained, in which the ZIF-8 material was fully confined within the ceramic support macropores, thus leading to enhanced thermo-mechanical strength. A judicious choice of both the deposition conditions of ZnO layers and the solvothermal treatment parameters for their subsequent conversion to ZIF-8 were the key points for validation of this original protocol and evaluation of its potential for up-scaling on tubular industrial supports. The physico-chemical characterization of the ZIF-8/ZnO/α-Al2O3 nanocomposite membranes was completed by a study of their gas transport properties. Reproducible ZIF-8/ZnO/α-Al2O3 nanocomposite membranes were produced and tested in the separation of binary gas mixtures: membranes were found to extract H2 from H2/CO2 and H2/CH4 equimolar gas mixtures with selectivities of about 7.8 and 12.5 respectively, measured at 100°C.

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