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Title: Thermoresponsive magnetic nanoparticles for seawater desalination
Authors: Zhao, Q.
Chen, N.
Zhao, D.
Lu, X. 
Keywords: draw solution
forward osmosis
magnetic nanoparticle
seawater desalination
thermoresponsive copolymer
Issue Date: 13-Nov-2013
Citation: Zhao, Q., Chen, N., Zhao, D., Lu, X. (2013-11-13). Thermoresponsive magnetic nanoparticles for seawater desalination. ACS Applied Materials and Interfaces 5 (21) : 11453-11461. ScholarBank@NUS Repository.
Abstract: Thermoresponsive magnetic nanoparticles (MNPs) as a class of smart materials that respond to a change in temperature may by used as a draw solute to extract water from brackish or seawater by forward osmosis (FO). A distinct advantage is the efficient regeneration of the draw solute and the recovery of water via heat-facilitated magnetic separation. However, the osmotic pressure attained by this type of draw solution is too low to counteract that of seawater. In this work, we have designed a FO draw solution based on multifunctional Fe3O4 nanoparticles grafted with copolymer poly(sodium styrene-4-sulfonate)-co-poly(N-isopropylacrylamide) (PSSS-PNIPAM). The resulting regenerable draw solution shows high osmotic pressure for seawater desalination. This is enabled by three essential functional components integrated within the nanostructure: (i) a Fe3O4 core that allows magnetic separation of the nanoparticles from the solvent, (ii) a thermoresponsive polymer, PNIPAM, that enables reversible clustering of the particles for further improved magnetic capturing at a temperature above its low critical solution temperature (LCST), and (iii) a polyelectrolyte, PSSS, that provides an osmotic pressure that is well above that of seawater. © 2013 American Chemical Society.
Source Title: ACS Applied Materials and Interfaces
ISSN: 19448244
DOI: 10.1021/am403719s
Appears in Collections:Staff Publications

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