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

Handle URI:
http://hdl.handle.net/10754/563005
Title:
Ferric and cobaltous hydroacid complexes for forward osmosis (FO) processes
Authors:
Ge, Qingchun; Fu, Fengjiang; Chung, Neal Tai-Shung ( 0000-0003-3704-8609 )
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.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC)
Publisher:
Elsevier BV
Journal:
Water Research
Issue Date:
Jul-2014
DOI:
10.1016/j.watres.2014.03.024
Type:
Article
ISSN:
00431354
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.
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorGe, Qingchunen
dc.contributor.authorFu, Fengjiangen
dc.contributor.authorChung, Neal Tai-Shungen
dc.date.accessioned2015-08-03T12:03:57Zen
dc.date.available2015-08-03T12:03:57Zen
dc.date.issued2014-07en
dc.identifier.issn00431354en
dc.identifier.doi10.1016/j.watres.2014.03.024en
dc.identifier.urihttp://hdl.handle.net/10754/563005en
dc.description.abstractCupric 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.en
dc.description.sponsorshipWe 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.en
dc.publisherElsevier BVen
dc.subjectDesalinationen
dc.subjectDraw solutionen
dc.subjectForward osmosisen
dc.subjectHydroacid complexen
dc.subjectWater treatmenten
dc.titleFerric and cobaltous hydroacid complexes for forward osmosis (FO) processesen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalWater Researchen
dc.contributor.institutionDepartment of Chemical and Biomolecular Engineering, National University of Singapore, SG 117576, Singaporeen
kaust.authorChung, Neal Tai-Shungen
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