Effective incorporation of clay in MMMs by in-situ polymerization of polyaniline in the presence of clay
Paper ID : 1240-MST2015-FULL
Akbar Samadi gh1, Amir H. Navarchian *2
2Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, P.O.Box 81746-73441, Isfahan, Iran.
Clay minerals were modified by in-situ polymerization of polyaniline in presence of organophilic clay (30B) and then the exfoliated clay platelets within polyaniline macromolecules were used to preparation of mixed-matrix membranes (MMMs) by solution casting method. Chemical structure and morphology of polyaniline/clay (PC) powder were analyzed by Furrier transform infrared (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. XRD spectra of PC particles illustrated exfoliation of silicate layers throughout the PAni matrix. Flower petal like morphology of PC powder was observed in the SEM images. The membranes were examined for removal of CO2 from natural gas. The PC platelets reduced membrane permeability for all penetrants at low PC concentration, while void formation in high PC content compensates the barrier effect of PC platelets and the optimum concentration for PC was 5 wt% which 20 % permeability enhancement for CO2 gas without any significant reduction in CO2/CH4 selectivity was obtained. The results indicates that effective incorporation of clay as a barrier at very low concentrations (1 wt%) enhances membrane performance for CO2/CH4 gas separation.
Polyimide, polyaniline, exfoliated clay, mixed-matrix membrane, gas barrier
Status : Paper Accepted (Oral Presentation)