Polysulfone membrane, mixed-matrix membranes with

Small-pore zeolite Nu-6(2) has a NSI-type structure and two different types of eight-membered-ring channels with limiting dimensions of 2.4 and 3.2 A [54]. Gorgojo and coworkers developed mixed-matrix membranes using Nu-6(2) as the dispersed zeolite phase and polysulfone Udel as the continuous organic polymer phase [55]. These mixed-matrix membranes showed remarkably enhanced H2/ CH4 selectivity compared to the bare polysulfone membrane. The H2/CH4 selectivity increased from 13 for the bare polysulfone membrane to 398 for the Nu-6(2)/ polysulfone mixed-matrix membranes. This superior performance of the Nu-6(2)/ polysulfone mixed-matrix membranes is attributed to the molecular sieving role played by the selected Nu-6(2) zeoHte phase in the membranes. 

Rafizah WAW, Ismail AF (2008) Effect of carbon molecular sieve sizing with poly(vinyl pyrrolidone) K-15 on carbon molecular sieve-polysulfone mixed matrix membrane. J Membr Sci 307(1) 53-61... 

In another approach, a liquid-polymer mixed-matrix membrane was prepared by first soaking a wet porous support membrane (e.g., polysulfone) in a solution containing liquid fillers (e.g., glycerol) for a period of 2 h, followed by drying for a period of 10 h at room temperature. The treated porous support membrane was then coated with the emulsified solution described above to form a liquid-polymer mixed-matrix membrane. 

Kulprathipanja and Charoenphol ° studied PEG-activated carbon-polymer mixed-matrix membranes. These membranes were prepared by impregnating activated carbon with PEG first, then adding the impregnated activated carbon to a silicone mbber solution to form a suspended solution, and finally coating the suspended solution on a porous polysulfone membrane. After coating, the membrane was further cured to form the SR -t- (PEG-activated carbon)-PS mixed-matrix membranes. Activated carbon was... 

Geong and coworkers reported a new concept for the formation of zeolite/ polymer mixed-matrix reverse osmosis (RO) membranes by interfacial polymerization of mixed-matrix thin films in situ on porous polysulfone (PSF) supports [83]. The mixed-matrix films comprise NaA zeoHte nanoparticles dispersed within 50-200 nm polyamide films. It was found that the surface of the mixed-matrix films was smoother, more hydrophilic and more negatively charged than the surface of the neat polyamide RO membranes. These NaA/polyamide mixed-matrix membranes were tested for a water desalination application. It was demonstrated that the pure water permeability of the mixed-matrix membranes at the highest nanoparticle loadings was nearly doubled over that of the polyamide membranes with equivalent solute rejections. The authors also proved that the micropores of the NaA zeolites played an active role in water permeation and solute rejection. 

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