Osmotic Pumping and Salt Rejection by Polyelectrolyte Hydrogel for Continuous Solar Desalination

被引:155
作者
Zeng, Jian [1 ]
Wang, Qingyang [1 ]
Shi, Yang [1 ,2 ]
Liu, Ping [3 ]
Chen, Renkun [1 ]
机构
[1] Univ Calif San Diego, Dept Mech & Aerosp Engn, San Diego, CA 92093 USA
[2] Harbin Inst Technol Shenzhen, Dept Mech Engn, Shenzhen 518000, Peoples R China
[3] Univ Calif San Diego, Dept Nano Engn, San Diego, CA 92093 USA
基金
美国国家科学基金会;
关键词
ionic pumping; osmotic pressure; polyelectrolyte hydrogels; salt rejection; solar desalination; STEAM-GENERATION; SEAWATER DESALINATION; WATER DESALINATION; POLYMER HYDROGELS; ONE SUN; EFFICIENT; GRAPHENE; EVAPORATION; OSMOSIS; ENERGY;
D O I
10.1002/aenm.201900552
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Efficient mass transport and selective salt rejection are highly desirable for solar or thermally driven seawater desalination, but its realization is challenging. Here a new liquid supply mechanism is proposed, i.e., ionic pumping effect, using a polyelectrolyte hydrogel foam (PHF), demonstrated with poly(sodium acrylate) [P(SA)] embedded in a microporous carbon foam (CF). The PHF simultaneously possesses high osmotic pressure for liquid transport and a strong salt-rejection effect. The PHF is able to sustain high flux of approximate to 24 L per m(2) per hour (LMH), comparable to the evaporative flux under 15 suns, and a salt rejection ratio over 80%. Compared to the porous carbon foam without the polyelectrolyte hydrogel, i.e., with only the capillary pumping effect, the PHF yields a 42.4% higher evaporative flux, at approximate to 1.6 LMH with DI water and approximate to 1.3 LMH with simulated seawater under one-sun condition due to the more efficient ionic liquid pumping. More importantly, thanks to the strong salt-rejection effect, the PHF shows a continuous and stable solar-driven desalination flux of approximate to 1.3 LMH under one-sun over 72 h, which has not been achieved before. The successful demonstration of both efficient ionic pumping and strong salt rejection effects makes the PHF an attractive platform for sustainable solar-driven desalination.
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页数:11
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