Systematic structure control of ammonium iodide salts as feasible UCST-type forward osmosis draw solutes for the treatment of wastewater

Park, Jeong-Seon; Joo, Heeyoung; Noh, Minwoo; Namkoong, Yon; Lee, Seonju; Jung, Ki Hwan; Ahn, Hye Ryun; Kim, Seulah; Lee, Jong-Chan; Yoon, Jin‐Kook; Lu, Yan

doi:10.1039/c7ta09741g

Cited by 21 publications

(9 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Noticeably, because the monomer of hydrogels is almost chemically identical to the IL, using 30 g IL/2 g hydrogel in 70 g of DI water is equivalent to 31.4 wt % IL in terms of the amount of active materials, which is lower than the case of using 40 g IL in 70 g of DI water (36.4 wt %). This means that the binary draw solute system can not only reduce the cost of draw solutes but also reinforce the draw performance in a long run while maintaining a comparably low reverse solute flux, of 13.6 ± 2.7 g/m 2 ·h (or 0.031 ± 0.006 mol/m 2 ·h) (Figure S4) as those performed by typical IL-based draw solute systems reported in the literature. , Note that these values were compared when cellulose acetate membranes were used for FO tests.…”

Section: Resultsmentioning

confidence: 80%

“…This means that the binary draw solute system can not only reduce the cost of draw solutes but also reinforce the draw performance in a long run while maintaining a comparably low reverse solute flux, of 13.6 ± 2.7 g/m 2 ·h (or 0.031 ± 0.006 mol/m 2 ·h) (Figure S4) as those performed by typical IL-based draw solute systems reported in the literature. 46,47 Note that these values were compared when cellulose acetate membranes were used for FO tests.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Forward Osmosis Desalination with a Hybrid Ionic Liquid/Hydrogel Thermoresponsive Draw Agent System

Hsu

Bui

et al. 2019

ACS Omega

View full text Add to dashboard Cite

Forward osmosis (FO) has emerged as a new technology for desalination and exhibits potentials for applications where reverse osmosis is incapable or uneconomical for treating streams with high salinity or fouling propensity. However, most of current draw agents in FO are salts and difficult to be recycled cost- and energy-effectively. In this work, we demonstrate a new and facile approach to efficiently recover water from the FO process with enhanced water purity by using a binary ion liquid/hydrogel system. The hybrid ion liquid/hydrogel draw solution system demonstrated in this work synergistically leverages the thermoresponsive properties of both the ionic liquid (IL) and hydrogel to improve the overall FO performance. Our findings corroborate that the hydrogel mitigates the water flux decline of the IL as the draw agent and provide a ready route to contiguously and effectively regenerate water from the FO process. Such a route allows for an efficient recovery of water from the draw solute/water mixture with enhanced water purity, compared with conventional thermal treating of lower critical solution temperature IL draw solute/water. Furthermore, hydrogels can be used in a continuous and readily recyclable process to recover water without heating the entire draw solute/water mixture. Our design principles open the door to use low-grade/waste heat or solar energy to regenerate draw agents and potentially reduce energy in the FO process considerably.

show abstract

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Enhanced Forward Osmosis Desalination with a Hybrid Ionic Liquid/Hydrogel Thermoresponsive Draw Agent System

Hsu

Bui

et al. 2019

ACS Omega

View full text Add to dashboard Cite

show abstract

“…This is because the bulkier naphthyl group has a symmetric structure and is delocalized by intramolecular electron transfer, which favors phase separation. 64 For example, when the concentrations of the aqueous solutions were 5, 10, 15, and 20 wt%, the LCSTs of [N 4444 ][NS] were approximately 59, 44, 39, and 37 °C, respectively. Additionally, the respective LCSTs of [P 4444 ][NS] were approximately 28, 25, 21, and 19 °C.…”

Section: Resultsmentioning

confidence: 99%

Influence of the anionic structure and central atom of a cation on the properties of LCST-type draw solutes for forward osmosis

Cho

Kang

2022

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…This study focused on NH 4 HCO 3 for the proof-of-concept demonstration, but other recoverable solutes can be suitable for the concept, for example, switchable polarity solvents and upper critical solution temperature salts. , We clarify that DD desalination with thermally recoverable solutes is not intended to directly compete with state-of-the-art RO in the large-scale potable water supply. Rather, it can be an alternative for niche applications, such as the example of agricultural water production.…”

Section: Discussionmentioning

confidence: 99%

Donnan Dialysis Desalination with a Thermally Recoverable Solute

Fan

Yip

2022

ACS EST Eng.

View full text Add to dashboard Cite

This study presents a novel desalination technology that couples Donnan dialysis (DD) with thermally-recoverable solutes and utilizes low-grade heat as energy input. In the proposed process, saline feed streams and receiver solutions of concentrated NH 4 HCO 3(aq) flow stepwise across cation-and anion-exchange membranes. The large transmembrane concentration differences of NH 4 + and HCO 3 − set up electrochemical potential gradients to drive the uphill transport of Na + and Cl − ions, respectively, from the saline feed into the receiver stream. Warming the two outlet streams using low-temperature thermal sources volatilizes NH 3 and CO 2 , thus removing NH 4 HCO 3 to yield desalinated product water and concentrated brine. The separated NH 3(g) and CO 2(g) are then recycled to reconstitute the receiver solution. The concept was first experimentally validated by desalinating brackish water simulated with 100 mM NaCl solutions to freshwater salinities (<17 mM). DD desalination was then demonstrated for larger ranges of feed and receiver concentrations of 100−1000 mM, and the experimental salt removals showed good agreement with theoretical Donnan equilibria (within 5%). The experimental results revealed that the unavoidable permeation of receiver solute co-ions due to imperfect membrane permselectivities is the main factor that prevents the theoretical thermodynamic potential from being reached. Nonetheless, current commercial ion-exchange membranes are sufficient to suppress the undesired co-ion leakage, yielding salt removals adequate for practical desalination. Module-scale analysis quantitatively showed that countercurrent DD operation can obtain higher desalination performance compared to co-current flows, achieving salt removals and water recovery yields as high as 95.5 and 87.5%, respectively. The utilization of low-grade thermal sources, such as waste heat and low-temperature geothermal reservoirs, as the primary energy input to drive the innovative approach opens up opportunities to lower the carbon intensity of desalination.

show abstract

Systematic structure control of ammonium iodide salts as feasible UCST-type forward osmosis draw solutes for the treatment of wastewater

Abstract: Systematic structure control of ammonium iodide salts is designed using novel UCST-type forward osmosis draw solutes for wastewater treatment.

Cited by 21 publications

References 70 publications

Enhanced Forward Osmosis Desalination with a Hybrid Ionic Liquid/Hydrogel Thermoresponsive Draw Agent System

Enhanced Forward Osmosis Desalination with a Hybrid Ionic Liquid/Hydrogel Thermoresponsive Draw Agent System

Influence of the anionic structure and central atom of a cation on the properties of LCST-type draw solutes for forward osmosis

Donnan Dialysis Desalination with a Thermally Recoverable Solute

Contact Info

Product

Resources

About