International Science Index


Improving Gas Separation Performance of Poly(Vinylidene Fluoride) Based Membranes Containing Ionic Liquid


Polymer based membranes are one of the low-cost technologies available for the gas separation. Three major elements required for a commercial gas separating membrane are high permeability, high selectivity, and good mechanical strength. Poly(vinylidene fluoride) (PVDF) is a commercially available fluoropolymer and a widely used membrane material in gas separation devices since it possesses remarkable thermal, chemical stability, and excellent mechanical strength. The PVDF membrane was chemically modified by soaking in different ionic liquids and dried. The thermal behavior of modified membranes was investigated by differential scanning calorimetry (DSC), and thermogravimetry (TGA), and the results clearly show the best affinity between the ionic liquid and the polymer support. The porous structure of the PVDF membranes was clearly seen in the scanning electron microscopy (SEM) images. The CO₂ permeability of blended membranes was explored in comparison with the unmodified matrix. The ionic liquid immobilized in the hydrophobic PVDF support exhibited good performance for separations of CO₂/N₂. The improved permeability of modified membrane (PVDF-IL) is attributed to the high concentration of nitrogen rich imidazolium moieties.

[1] Boot-Handford, M. et al. 2013.Carbon Capture and Storage Update. Energy & Environmental Science. 7, 130-189
[2] Zhang, J.; Webley, P.A.; Xiao, P. 2008. Effect of process parameters on power requirements of vacuum swing adsorption technology for CO2 capture from flue gas. The journal Energy Conversion and Management. 49, 346–356.
[3] Lively, R. P. et al. 2012. A high-flux polyimide hollow fiber membrane to minimize footprint and energy penalty for CO2 recovery from flue gas. Journal of Membrane Science. 423–424, 302–313
[4] Merkel, T. C., Lin, H., Wei, X. and Baker, R. 2010. Power plant post-combustion carbon dioxide capture: An opportunity for membranes. Journal of Membrane Science. 359, 126–139.
[5] Robeson, L. M. 2008. The upper bound revisited. Journal of Membrane Science. 320, 390–400.
[6] Li, P., Chung, T. S. & Paul, D. R. 2013.Gas sorption and permeation in PIM-1. Journal of Membrane Science 432, 50–57.
[7] Sridhar, S. Smith, B. Ramakrishn M. and Aminabhavi, T. M. 2006. Modified poly(phenylene oxide) membranes for the separation of carbon dioxide from methane, Journal of Membrane Science. 280, 202-209.
[8] Budd, P. M. et al. 2004. Solution-Processed, Organophilic membrane derived from a Polymer of Intrinsic Microporosity. Journal of Advanced Materials. 16, 456–459.
[9] Ricardo, C. Luísa N. Pedro, S. and Isabel, C. 2015. Supported Ionic Liquid Membranes and Ion-Jelly® Membranes with (BMIM)(DCA): Comparison of Its Performance for CO2 Separation. Journal of Membranes. 5, 13-21.
[10] Seoul, C. Kim, Y.T. and Baek, C.K. 2003. Electrospinning of polyvinylidene fluoride/dimethyl formamide solutions with carbon nano tubes. Journal of applied polymer science. 41, 1572-1577.
[11] Wang, D., K. Li and Teo, W.K. 2000. Porous PVDF asymmetric hollow fiber membranes prepared with the use of small molecular additives, Journal of Membrane Science. 178, 13-23
[12] Mago, G. Kalyon, D. M. and Fisher, F.T. 2008. Membranes of polyvinylidene fluoride and PVDF nano composites with carbon nanotubes via immersion precipitation. Journal of Nanomaterials. 759825, 1-8.
[13] Gregory, R. G. Yinjin, P. Minghua, L. and Eric, M. V. H. 2011. Preparation and Characterization of Membranes Formed by Nonsolvent Induced Phase Separation: A Review. Ind. Eng. Chem. Res., 50, 3798–3817.