Novel mixed matrix hollow fiber membranes composed of a PBI/POSS outer layer and a PAN/PVP inner layer have been developed for forward osmosis and osmotic power generation. It is found that the incorporation of a small amount of POSS nanoparticles into the outer PBI dope has significant influence on both the morphology and the performance of the developed membranes. The addition of POSS and PVP into the outer PBI and inner PAN dopes respectively resulted in an integrally macrovoid-free and delamination-free dual-layer membrane. Increasing POSS concentration in the PBI dope enhances both water and salt permeability across the membranes. A POSS loading of 0.5wt% has been identified through NF and FO tests as the optimal concentration in this study. The membrane with this optimized concentration shows a maximum water flux 31.37LMH at room temperature using 2.0M MgCl2 as the draw solution in the FO process and a maximum power density of 2.47W/m2 in the PRO process at 7bar using 1.0M NaCl as the draw solution. With its unique fully hydrophilic structure, easy processability and cost-effective ultra-thin PBI outer-layer, this membrane may have wide applications in the future.
|Original language||English (US)|
|Number of pages||12|
|Journal||Journal of Membrane Science|
|State||Published - Sep 15 2013|
Bibliographical noteFunding Information:
This research grant is supported by the Singapore National Research Foundation under its Environmental and Water Technologies Strategic Research Programme and administered by the Environment and Water Industry Programme Office (EWI) of the PUB for the project entitled, “Membrane development for osmotic power generation: Phase 1: Materials development and membrane fabrication” (Grant number R-279-000-381-279 ). Special thanks to Dr. Su Jincai for his great help on the membrane spinning technique guidance.
- Dual layer
- Forward osmosis (FO)
- Mixed matrix membranes (MMMs)
- Pressure retarded osmosis (PRO)
ASJC Scopus subject areas
- Materials Science(all)
- Physical and Theoretical Chemistry
- Filtration and Separation