Synthesis and Preparation of Asymmetric PSf/ZIF-8 Mixed Matrix Membrane for CO2/CH4 Separation

Utilizing nano-size filler into polymer matrix would overcome challenges in developing mmm by providing good dispersion in polymer matrix, high contact polymer-filler even at low filler loading. asymmetric neat polysulfone (psf) and psf/zeolitic imidazole framework-8 (psf/zif-8) mixed matrix membrane was prepared using dry/wet inversion method. membrane prepared was coated with 3wt% of polydimethylsiloxane (pdms) in n-hexane and undergoes heat treatment. the membranes was characterized using x-ray diffraction (xrd), thermagravimetric analysis (tga), differential scanning calorimetry (dsc), and gas permeation test at 4 bar. xrd pattern revealed that zif-8 was successfully synthesis with crystal size around 73nm. lowered membrane tg after embodiment of zif-8 suggests that additional free volume form, while thermal stability up to 350°c related to zif-8 stability. neat psf prepared shows co2 permeance at 4.97 gpu with co2/ch4 selectivity at 7.52. interestingly, incorporation of zif-8 showing improvement for both co2 permeance and co2/ch4 selectivity up to 51% and 47% respectively. thus, employing nano zif-8 as filler into psf matrix has resultant promising membrane for co2/ch4 separation.