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    Ferric and cobaltous hydroacid complexes for forward osmosis (FO) processes

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    Type
    Article
    Authors
    Ge, Qingchun
    Fu, Fengjiang
    Chung, Neal Tai-Shung cc
    KAUST Department
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2014-07
    Permanent link to this record
    http://hdl.handle.net/10754/563005
    
    Metadata
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    Abstract
    Cupric and ferric hydroacid complexes have proven their advantages as draw solutes in forward osmosis in terms of high water fluxes, negligible reverse solute fluxes and easy recovery (Ge and Chung, 2013. Hydroacid complexes: A new class of draw solutes to promote forward osmosis (FO) processes. Chemical Communications 49, 8471-8473.). In this study, cobaltous hydroacid complexes were explored as draw solutes and compared with the ferric hydroacid complex to study the factors influencing their FO performance. The solutions of the cobaltous complexes produce high osmotic pressures due to the presence of abundant hydrophilic groups. These solutes are able to dissociate and form a multi-charged anion and Na+ cations in water. In addition, these complexes have expanded structures which lead to negligible reverse solute fluxes and provide relatively easy approaches in regeneration. These characteristics make the newly synthesized cobaltous complexes appropriate as draw solutes. The FO performance of the cobaltous and ferric-citric acid (Fe-CA) complexes were evaluated respectively through cellulose acetate membranes, thin-film composite membranes fabricated on polyethersulfone supports (referred as TFC-PES), and polybenzimidazole and PES dual-layer (referred as PBI/PES) hollow fiber membranes. Under the conditions of DI water as the feed and facing the support layer of TFC-PES FO membranes (PRO mode), draw solutions at 2.0M produced relatively high water fluxes of 39-48 LMH (Lm-2hr-1) with negligible reverse solute fluxes. A water flux of 17.4 LMH was achieved when model seawater of 3.5wt.% NaCl replaced DI water as the feed and 2.0M Fe-CA as the draw solution under the same conditions. The performance of these hydroacid complexes surpasses those of the synthetic draw solutes developed in recent years. This observation, along with the relatively easy regeneration, makes these complexes very promising as a novel class of draw solutes. © 2014 Elsevier Ltd.
    Citation
    Ge, Q., Fu, F., & Chung, T.-S. (2014). Ferric and cobaltous hydroacid complexes for forward osmosis (FO) processes. Water Research, 58, 230–238. doi:10.1016/j.watres.2014.03.024
    Sponsors
    We thank the financial supports from Singapore National Research Foundation under its Competitive Research Program for the project entitled, "Advanced FO Membranes and Membrane Systems for Wastewater Treatment, Water Reuse and Seawater Desalination" (grant numbers: R-279-000-336-281 and R-279-000-339-281). Special thanks are also given to Dr. Panu Sukitpaneenit, Dr. Jincai Su and Ms. Xiaochen Lin for their valuable help.
    Publisher
    Elsevier BV
    Journal
    Water Research
    DOI
    10.1016/j.watres.2014.03.024
    PubMed ID
    24768702
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.watres.2014.03.024
    Scopus Count
    Collections
    Articles; Water Desalination and Reuse Research Center (WDRC)

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