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

Abstract

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 openmore » the door to use low-grade/waste heat or solar energy to regenerate draw agents and potentially reduce energy in the FO process considerably.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). The Molecular Foundry
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Storage and Distributed Resources Division
  4. Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Office (EE-4G); LBNL Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1496895
Alternate Identifier(s):
OSTI ID: 1508775
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
ACS Omega
Additional Journal Information:
Journal Volume: 4; Journal Issue: 2; Journal ID: ISSN 2470-1343
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; hydrogels; phase; proteins; water purification

Citation Formats

Hsu, Chih-Hao, Ma, Canghai, Bui, Ngoc, Song, Zhuonan, Wilson, Aaron D., Kostecki, Robert, Diederichsen, Kyle M., McCloskey, Bryan D., and Urban, Jeffrey J.. Enhanced Forward Osmosis Desalination with a Hybrid Ionic Liquid/Hydrogel Thermoresponsive Draw Agent System. United States: N. p., 2019. Web. doi:10.1021/acsomega.8b02827.
Hsu, Chih-Hao, Ma, Canghai, Bui, Ngoc, Song, Zhuonan, Wilson, Aaron D., Kostecki, Robert, Diederichsen, Kyle M., McCloskey, Bryan D., & Urban, Jeffrey J.. Enhanced Forward Osmosis Desalination with a Hybrid Ionic Liquid/Hydrogel Thermoresponsive Draw Agent System. United States. doi:10.1021/acsomega.8b02827.
Hsu, Chih-Hao, Ma, Canghai, Bui, Ngoc, Song, Zhuonan, Wilson, Aaron D., Kostecki, Robert, Diederichsen, Kyle M., McCloskey, Bryan D., and Urban, Jeffrey J.. Wed . "Enhanced Forward Osmosis Desalination with a Hybrid Ionic Liquid/Hydrogel Thermoresponsive Draw Agent System". United States. doi:10.1021/acsomega.8b02827.
@article{osti_1496895,
title = {Enhanced Forward Osmosis Desalination with a Hybrid Ionic Liquid/Hydrogel Thermoresponsive Draw Agent System},
author = {Hsu, Chih-Hao and Ma, Canghai and Bui, Ngoc and Song, Zhuonan and Wilson, Aaron D. and Kostecki, Robert and Diederichsen, Kyle M. and McCloskey, Bryan D. and Urban, Jeffrey J.},
abstractNote = {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.},
doi = {10.1021/acsomega.8b02827},
journal = {ACS Omega},
number = 2,
volume = 4,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1021/acsomega.8b02827

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