(610a) Facile Fabrication of Ultrathin Molecular Sieving ZIF-8 Hollow Fiber Membranes on Polydopamine-Polyethyleneimine Coated Microporous PVDF Supports
AIChE Annual Meeting
Wednesday, November 1, 2017 - 3:15pm to 3:37pm
To overcome these problems, we chemically-functionalized PVDF hollow fiber porous supports before the deposition of ZIF-8 particles using a simple coating process. Co-deposition of polydopamine (PDA) and polyethyleneimine (PEI) was conducted to induce the crystallization process of ZIF-8 on the support by the presence of cathecol group and produces more uniform coating of PVDF surface compared to traditional PDA deposition. Thin molecular sieving membrane was successfully synthesized simply by 5 hours deposition of support in ZIF-8 precursor solution. Thin layer of ZIF-8 (< 1 Î¼m in thickness) produced very high hydrogen permeance of approximately 105 x 10-7 mol m-2 s-1 Pa-1, which is one of the highest permeance for ZIF-8 membranes, and H2/CO2 selectivity of 7.5. Compared to our previous results utilizing TiO2/APTES modified PVDF support, the results from this study show slightly lower gas permeances but provides a easier fabrication route.