Energy-efficient desalination by forward osmosis using responsive ionic liquid draw solutes

Cai, Yufeng; Shen, Wenming; Wei, Jing; Chong, Tzyy Haur; Wang, Rong; Krantz, William B.; Fane, Anthony G.; Hu, Xiao

doi:10.1039/c4ew00073k

Cited by 79 publications

(99 citation statements)

References 41 publications

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“…A relative high initial flux of 9.7 LMH is observed, suggesting that STPH is a good candidate for seawater desalination by a FO process. This FO performance with the STPH draw solution was also benchmarked against most other reported draw solutes under comparable conditions, including dendrimers [18], hydroacid complexes [16,28], polyelectrolytes [29,30], responsive ionic liquid [31], and thermoresponsive copolymers [32,33]. Table 1 shows that the STPH draw solution exhibits superior FO performance to most of the other reported organic draw solutes.…”

Section: Forward Osmosis (Fo) Performancementioning

confidence: 97%

Sodium Tetraethylenepentamine Heptaacetate as Novel Draw Solute for Forward Osmosis—Synthesis, Application and Recovery

Long

Wang

2015

Energies

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Abstract:Osmotic energy, as a sustainable energy source with little environmental impact, has drawn much attention in both academia and industry in recent years. Osmotically driven membrane processes can harvest the osmotic energy and thus have great potential to produce sustainable clean water or electric energy. The draw solution, as an osmotic component, has been more and more explored by scientists in recent years in order to achieve a high osmotic pressure and suitable molecular size. In this work, a novel draw solute-sodium tetraethylenepentamine heptaacetate (STPH)-is synthesized and identified by nuclear magnetic resonance spectroscopy ( 1 H-NMR) and Fourier transform infrared (FTIR). Its solution properties are optimized in terms of the solution pH and concentration, and related to the forward osmosis (FO) performance. A water flux of 28.57 LMH and a low solute flux of 0.45 gMH can be generated with 0.5 g/mL STPH draw solution and de-ionized water (DI water) as the feed solution under pressure retarded osmosis (PRO) mode, which is superior to the FO performance with many other draw solutes reported. Further FO desalination test shows a stable water flux of 9.7 LMH with 0.3 g/mL STPH draw solution and 0.6 M NaCl feed solution. In addition, the draw solution recovery is also investigated.

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Section: Forward Osmosis (Fo) Performancementioning

confidence: 97%

Sodium Tetraethylenepentamine Heptaacetate as Novel Draw Solute for Forward Osmosis—Synthesis, Application and Recovery

Long

Wang

2015

Energies

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“…35 Their results showed that LCST-type of ILs were able to draw water from feed solutions up to a 1.6 M salt concentration at room temperature, and regenerate at high temperature when phase separation was induced.…”

Section: Introductionmentioning

confidence: 98%

Using UCST Ionic Liquid as a Draw Solute in Forward Osmosis to Treat High-Salinity Water

Zhong

Feng

Chen

et al. 2015

Environ. Sci. Technol.

114

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Using UCST ionic liquid as a draw solute in forward osmosis to treat high-salinity water Just Accepted "Just Accepted" manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides "Just Accepted" as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. "Just Accepted" manuscripts appear in full in PDF format accompanied by an HTML abstract. "Just Accepted" manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are accessible to all readers and citable by the Digital Object Identifier (DOI®). "Just Accepted" is an optional service offered to authors. Therefore, the "Just Accepted" Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the "Just Accepted" Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these "Just Accepted" manuscripts. KAUST Repository 1Using UCST ionic liquid as a draw solute in forward osmosis to treat high-salinity water IL-rich phase: the water-rich phase was the produced water that contained a low IL concentration, and the IL-rich phase could be used directly as the draw solution in the next cycle of the FO process. The thermal stability, thermal-responsive solubility and UV-vis absorption spectra of the IL were also studied in detail.

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“…Owing to their ionic character, ILs have a number of desirable attributes, such as negligible vapor pressure, high ionic conductance, and often high thermal and chemical stability [1][2][3][4] . The physicochemical properties of ionic liquids can be tailored by chemical modification of the cation and/or anion, leading to a vast number (>10 14 ) of distinct ionic liquid combinations 5 . This presents an enormous library of ionic liquids to fully explore.…”

mentioning

confidence: 99%

“…A subclass of ionic liquids undergoes a thermoresponsive liquid-liquid phase transition of either an upper critical solution temperature (UCST) or lower critical solution temperature (LCST). Such thermoresponsive IL-based mixtures have opened up new potential applications such as protein extraction [10][11][12] , metal ion extraction 13 , and forward osmosis draw solutes for water purification [14][15][16][17][18] .…”

mentioning

confidence: 99%

Molecular insight into the lower critical solution temperature transition of aqueous alkyl phosphonium benzene sulfonates

et al. 2019

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Ionic liquid (IL)-water mixtures can exhibit a lower critical solution temperature (LCST) transition, but changes in long-range order and local molecular environment during this transition are not comprehensively understood. Here we show that in IL-H 2 O LCST mixtures, the IL forms loosely held aggregate structures that grow in size leading up to a critical temperature, whereas the aggregation of a fully miscible aqueous mixture, obtained by minor chemical modification of the anion, decreases with increasing temperature. Radial distribution functions from molecular dynamics simulations support the observation of aggregation phenomena in the IL-H 2 O mixtures. A local molecular structure of the ions is derived from multi-dimensional NMR experiments in conjunction with reported molecular dynamics simulations. In addition to considerable shifts of water's hydrogen bonding network in the fully miscible phase, by NMR we observe the anion's protons response to the intermolecular thermal environment and the intramolecular environment and find that the responses are determined by the sulfonate ionic functional group.

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Energy-efficient desalination by forward osmosis using responsive ionic liquid draw solutes

Abstract: New thermally responsive ionic liquid draw solutes generate high flux against seawater with substantially reduced electrical energy consumption.

Cited by 79 publications

References 41 publications

Sodium Tetraethylenepentamine Heptaacetate as Novel Draw Solute for Forward Osmosis—Synthesis, Application and Recovery

Sodium Tetraethylenepentamine Heptaacetate as Novel Draw Solute for Forward Osmosis—Synthesis, Application and Recovery

Using UCST Ionic Liquid as a Draw Solute in Forward Osmosis to Treat High-Salinity Water

Molecular insight into the lower critical solution temperature transition of aqueous alkyl phosphonium benzene sulfonates

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