title: Synthesis and Transport Properties of Novel MOF/PIM-1/MOF Sandwich Membranes for Gas Separation.
abstract: Metal-organic frameworks (MOFs) were supported on polymer membrane substrates for the fabrication of composite polymer membranes based on unmodified and modified polymer of intrinsic microporosity (PIM-1). Layers of two different MOFs, zeolitic imidazolate framework-8 (ZIF-8) and Copper benzene tricarboxylate ((HKUST-1), were grown onto neat PIM-1, amide surface-modified PIM-1 and hexamethylenediamine (HMDA) -modified PIM-1. The surface-grown crystalline MOFs were characterized by a combination of several techniques, including powder X-ray diffraction, infrared spectroscopy and scanning electron microscopy to investigate the film morphology on the neat and modified PIM-1 membranes. The pure gas permeabilities of He, H₂, O₂, N₂, CH₄, CO₂ were studied to understand the effect of the surface modification on the basic transport properties and evaluate the potential use of these membranes for industrially relevant gas separations. The pure gas transport was discussed in terms of permeability and selectivity, highlighting the effect of the MOF growth on the diffusion coefficients of the gas in the new composite polymer membranes. The results confirm that the growth of MOFs on polymer membranes can enhance the selectivity of the appropriately functionalized PIM-1, without a dramatic decrease of the permeability.
authors.affiliation: Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, Rende (CS) 87036, Italy. a.fuoco@itm.cnr.it.
authors.forename: Alessio
authors.initials: A
authors.lastname: Fuoco
authors.affiliation: School of Chemistry, University of Manchester, Manchester M13 9PL, UK. mradhi.2008@gmail.com.
authors.forename: Muhanned R
authors.initials: MR
authors.lastname: Khdhayyer
authors.affiliation: School of Chemistry, University of Manchester, Manchester M13 9PL, UK. m.attfield@manchester.ac.uk.
authors.forename: Martin P
authors.initials: MP
authors.lastname: Attfield
authors.affiliation: Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, Rende (CS) 87036, Italy. e.esposito@itm.cnr.it.
authors.forename: Elisa
authors.initials: E
authors.lastname: Esposito
authors.affiliation: Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, Rende (CS) 87036, Italy. johannescarolus.jansen@cnr.it.
authors.forename: Johannes C
authors.initials: JC
authors.lastname: Jansen
authors.affiliation: School of Chemistry, University of Manchester, Manchester M13 9PL, UK. Peter.Budd@manchester.ac.uk.
authors.forename: Peter M
authors.initials: PM
authors.lastname: Budd
keywords: composite membrane; gas permeation; metal-organic framework; polymer of intrinsic microporosity