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Ferric and cobaltous hydroacid complexes for forward osmosis (FO) processes
Qingchun Ge1, Fengjiang Fu1, Tai-Shung Chung2
1Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117576, Singapore.
Water Research
|April 29, 2014
Summary
Cobaltous hydroacid complexes show promise as draw solutes for forward osmosis (FO), achieving high water flux and minimal solute loss. Their easy regeneration makes them a potentially sustainable solution for FO processes.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Forward osmosis (FO) processes utilize draw solutes to facilitate water transport.
- Existing draw solutes like cupric and ferric hydroacid complexes offer advantages in water flux and recovery.
- There is a continuous need for novel draw solutes with improved performance and sustainability.
Purpose of the Study:
- To explore cobaltous hydroacid complexes as novel draw solutes for FO.
- To compare the FO performance of cobaltous hydroacid complexes with ferric hydroacid complexes.
- To investigate factors influencing the performance of these hydroacid complexes in FO.
Main Methods:
- Synthesis and characterization of cobaltous hydroacid complexes.
- Evaluation of FO performance using cellulose acetate, TFC-PES, and PBI/PES membranes.
- Testing under varying feed conditions, including DI water and model seawater.
Main Results:
- Cobaltous hydroacid complexes exhibit high osmotic pressures due to abundant hydrophilic groups.
- High water fluxes (39-48 LMH) and negligible reverse solute flux were observed with TFC-PES membranes.
- A water flux of 17.4 LMH was achieved with model seawater using a ferric-citric acid complex.
Conclusions:
- Cobaltous hydroacid complexes are suitable draw solutes for FO, offering high water flux and easy regeneration.
- The performance of these hydroacid complexes surpasses many recently developed synthetic draw solutes.
- These complexes represent a promising new class of draw solutes for efficient forward osmosis applications.
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