TY - JOUR
T1 - Using UCST ionic liquid as a draw solute in forward osmosis to treat high-salinity water
AU - Zhong, Yujiang
AU - Feng, Xiaoshuang
AU - Chen, Wei
AU - Wang, Xinbo
AU - Huang, Kuo-Wei
AU - Gnanou, Yves
AU - Lai, Zhiping
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2015/12/28
Y1 - 2015/12/28
N2 - The concept of using a thermo-responsive ionic liquid (IL) with an upper critical solution temperature (UCST) as a draw solute in forward osmosis (FO) was successfully demonstrated here experimentally. A 3.2 M solution of protonated betaine bis(trifluoromethylsulfonyl)imide ([Hbet][Tf2N]) was obtained by heating and maintaining the temperature above 56°C. This solution successfully drew water from high-salinity water up to 3.0 M through FO. When the IL solution cooled to room temperature, it spontaneously separated into a water-rich phase and an 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.
AB - The concept of using a thermo-responsive ionic liquid (IL) with an upper critical solution temperature (UCST) as a draw solute in forward osmosis (FO) was successfully demonstrated here experimentally. A 3.2 M solution of protonated betaine bis(trifluoromethylsulfonyl)imide ([Hbet][Tf2N]) was obtained by heating and maintaining the temperature above 56°C. This solution successfully drew water from high-salinity water up to 3.0 M through FO. When the IL solution cooled to room temperature, it spontaneously separated into a water-rich phase and an 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.
UR - http://hdl.handle.net/10754/584006
UR - http://pubs.acs.org/doi/10.1021/acs.est.5b03747
UR - http://www.scopus.com/inward/record.url?scp=84955505053&partnerID=8YFLogxK
U2 - 10.1021/acs.est.5b03747
DO - 10.1021/acs.est.5b03747
M3 - Article
C2 - 26649525
SN - 0013-936X
VL - 50
SP - 1039
EP - 1045
JO - Environmental Science & Technology
JF - Environmental Science & Technology
IS - 2
ER -