Thermo-sensitive hydrogels for forward osmosis with NIR light-induced freshwater recovery

We report a near-infrared light-responsive hydrogel material consisting of two parts of a monomer, an ionic liquid monomer (TVBP) and N -isopropylacrylamide (NIPAM), whose crosslinker is diacrylate containing poly(propylene glycol), all three of which are temperature sensitive. Interestingly, the io...

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Bibliographic Details
Published in:Polymer chemistry 2023-02, Vol.14 (6), p.697-77
Main Authors: Xu, Xiang, Li, Haihui, Cheng, Jiannan, Zhang, Lifen, Cheng, Zhenping
Format: Article
Language:English
Subjects:
Brackish water
Desalination
Fresh water
Hydrogels
Ionic liquids
Isopropylacrylamide
Light emitting diodes
Monomers
Nanoparticles
Near infrared radiation
Osmosis
Photothermal conversion
Polymer chemistry
Propylene
Recovery
Silicon dioxide
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Summary:We report a near-infrared light-responsive hydrogel material consisting of two parts of a monomer, an ionic liquid monomer (TVBP) and N -isopropylacrylamide (NIPAM), whose crosslinker is diacrylate containing poly(propylene glycol), all three of which are temperature sensitive. Interestingly, the ionic liquid monomer TVBP can also generate a relatively high osmotic pressure, allowing the hydrogels to draw fresh water from brackish water through a semi-permeable membrane. These properties make it possible to use it for desalination by forward osmosis (FO). It is possible to skillfully recover fresh water (recovery rate was about 95%) from hydrogels through photothermal conversion generated by irradiation with near-infrared light-emitting diode (NIR LED) light onto croconaine dye-doped silica nanoparticles (NIR-800@SiO 2 NPs). The nanoparticles, which were designed and synthesized for the first time by us, can flexibly respond to NIR light (in this paper, λ max = 760 nm) while exhibiting inertness to sunlight, making the water drawing and desalination process weather-independent ( e.g. , when the sun shines or when it is dark). The proposal of this scheme is expected to provide a considerable reference for continuous water desalination. Croconaine dye-doped silica nanoparticles with excellent ability of photothermal conversion and photostability were used for the NIR light-driven water recovery of hydrogels in FO desalination just by simply turning on the light source.
ISSN:1759-9954
1759-9962
DOI:10.1039/d2py01234k