We reported the use of high-performance, CO2-accelerated mixed matrix membranes (MMMs) consisting of sub-micron porous magnesium oxide (MgO) fillers and an amphiphilic polymer matrix. Bimodal-porous, hollow MgO (bh-MgO) spheres were synthesized through a one-step spray pyrolysis and precipitation method. The synthesized bh-MgO spheres were introduced into poly(vinyl chloride)-graft-poly(oxyethylene methacrylate) (PVC-g-POEM), forming MMMs for CO2/N2 separation. The amphiphilic property of PVC-g-POEM ensured an intimate contact between the bh-MgO filler and polymer matrix with the encapsulation of bh-MgO spheres. The bimodal porous and hollow structure of bh-MgO decreased the gas diffusion resistance in the membranes. Moreover, specific interactions between the surfaces of the bh-MgO and CO2 molecules enhanced the CO2 solubility and accelerate the CO2 molecules more than the N2 molecules. The dual-functional bh-MgO sphere enhanced the CO2 permeability through physical and chemical mechanisms, simultaneously. The best gas separation performance was obtained in the MMM with 10 wt% bh-MgO fillers, which demonstrated a CO2 permeability of 179.2 Barrer and 42.6 of CO2/N2 selectivity.
|Journal||Separation and Purification Technology|
|Publication status||Published - 2020 Nov 1|
Bibliographical noteFunding Information:
This work was financially supported by a grant from the Research Foundation (NRF) of South Korea funded by the Ministry of Science, ICT, and Future Planning ( NRF-2017R1D1A1B06028030 , NRF-2014R1A5A1009799 ).
© 2020 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Filtration and Separation