Synthesis And Properties Of Zeolite Membrane And POF Based Mixed-matrix Membrane

Porous materials with fascinating structure and wide applications is a hot spot inrecent years. Microporous membrane for separation is one of the most importantstudies, attracted lots of researchers.In general, the preparation of zeolite membranes requires high temperature andhigh pressure with organic template to support the channels and caves, which hinderthe development of its industrial application. In the first part of this thesis, thesynthesis of continuous and low-siliceous ZSM-5membranes was achieved withoutorganic templates under mild conditions (low temperature of100°C and ambientpressure). The surface morphologies and crystal nature were characterized by SEMand XRD respectively. ICP, XPS and adsorption showed that the as-synthesizedZSM-5membrane was hydrophilic.The resulted high-quality membranes with goodwater perm-selectivity were further applied for water/alcohol separations; andexhibited extraordinarily high separation factor of above10000and improved waterflux (3.43~6.88kg m-2h-1) for ethanol and isopropanol aqueous azeotropes.CO2-philic porous organic framework (SNW-1) membranes are facilelysynthesized by integrating SNW-1nanosized particles with available amino groupsand PSF matrix. Gas sorption measurements as well as IAST calculation havedemonstrated that SNW-1exhibits high sorption capacity and affinity toward CO2owing to its high micro-porosity and functional amino groups. As-prepared membraneis further applied for CO2separation. Gas separation results reveal that this compositemembrane shows high separation performance including high separation factor (34and40for CO2/CH4and CO2/N2) and enhanced CO2permeability (22.4barrer). Highperformance (high separation factor and enhanced permeability) holds great promiseof SNW-1/PSF membrane in CO2capture and separation.