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Polimer /MOF VE polimer/MOF/uyumlaştırıcıdan oluşan ikili ve üçlü karışık matrisli membranların gaz ayrım performansları

Gas separation performances of the binary (PES/MOF) and ternary (PES/MOF/additive) mixed matrix membranes Membrane separation is the most widely used separation technique nowadays. Mixed matrix membranes are formed by the incorporation of nanoporous molecular sieves into polymeric membranes. MMMs have gained importance in academic areas because they combine the desirable properties of the polymers and the inorganic materials and they have a very big potential in commercial usage (Mulder,1996). In this project polyethersulfone (PES) was be used as polymeric material, and one type of metal organic framework (MOF) was used as porous filler material that has been attracted very much attention in literature nowadays. MOFs are very promising adsorbents with tunable pore size, large pore volume, high specific surface area, high and selective gas adsorption capacities (Adams,2010). Combination of an inorganic cluster and an organic bridge in their structure makes them good candidates for membrane applications in the aspect of compatibility (Perez,2009). The proposed MOF type is ZIF-8. Also to increase the compatibility between the PES and ZIF-8, a low molecular weight material, 2-hydroxy 5-methyl aniline (HMA), was used as a third component in membrane formulation. In order to investigate the effect of ZIF-8 loading on the membrane performance, different types of membranes were prepared with varying amounts of ZIF-8 between 10-60% (w/w). Moreover, ternary mixed matrix membranes were synthesized consisting of different amounts of ZIF-8 between 10-30% (w/w) and HMA 1-10% (w/w). Gas transport properties of the membranes were investigated by single gas permeation experiments of H2, CO2 and CH4 at 3 bar feed pressure and binary gas permeation experiments of CO2/CH4 pair. Also in order to investigate the effect of feed pressure on the gas transport properties of the membranes, single gas experiments were conducted on 3, 6, 8, 10 and 12 bar feed pressures. Moreover the morphology and thermal characteristics of the membranes were characterized by scanning iv electron microscopy (FEI Quanta-400 F), thermal gravimetric analysis (Shimadzu DTG-60H), differential scanning calorimetry (Shimadzu DSC60) analysis.