CO2 Transport in Polysulfone Membranes Containing Zeolitic Imidazolate Frameworks As Determined by Permeation and PFG NMR Techniques

摘要: This work describes the preparation of mixed matrix membranes by casting from poly(1,4-phenylene ether−ether−sulfone) chloroform solutions containing dispersed zeolitic imidazolate frameworks. Diffusive studies CO2 in pristine membrane and composite were performed at 6 bar 298 K, using pulsed field gradient NMR techniques. The evolution heterogeneity diffusion environments as seen was monitored terms time a stretching parameter. values self-diffusion coefficient increase with filler content, 2.1 × 10−8 cm2 s−1 for to 9.3 30 wt % filler. Sorption permeation experiments carried out different pressures used determine dual-mode model parameters that describe transport processes. Apparent coefficients obtained lag method, model,...