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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Thermoresponsive copolymer-based draw solution for seawater desalination in a combined process of forward osmosis and membrane distillation
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Thermoresponsive copolymer-based draw solution for seawater desalination in a combined process of forward osmosis and membrane distillation

机译：正渗透和膜蒸馏相结合过程中用于海水淡化的基于热敏共聚物的拉伸溶液

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摘要

A thermoresponsive copolymer, poly(sodium styrene-4-sulfonate-co-n-isopropylacrylamide) (PSSS-PNIPAM), is employed as a draw solute in forward osmosis (FO) for seawater desalination. When PSSS-PNIPAM is dissolved in water to form a draw solution, PSSS as a strong polyelectrolyte generates a high osmotic pressure and extracts water from seawater in an FO process. A water flux of 4 LMH has been attained with simulated seawater as the feed solution. The draw solution is then regenerated with membrane distillation (MD) at a temperature above the low critical solution temperature (LCST) of PNIPAM, which agglomerates and leads to decreased osmotic pressure of the solution and thus higher water vapor pressure. The combined FO-MD process with PSSS-PNIPAM as the draw solute should be promising not only for seawater desalination, but also for other membrane-involved separation processes in wastewater treatment and protein or medicine enrichment
机译：热响应性共聚物聚（苯乙烯-4-磺酸钠-共正异丙基丙烯酰胺钠）（PSSS-PNIPAM）被用作海水淡化的正向渗透（FO）的牵引溶质。当PSSS-PNIPAM溶解在水中以形成汲取溶液时，PSSS作为强聚电解质会产生高渗透压，并在FO过程中从海水中提取水。用模拟海水作为进料溶液已达到4 LMH的水通量。然后，在高于PNIPAM的低临界溶液温度（LCST）的温度下，通过膜蒸馏（MD）使汲取的溶液再生，这会聚结并导致溶液的渗透压降低，从而导致更高的水蒸气压。 FO-MD工艺与PSSS-PNIPAM结合作为萃取溶质，不仅有望用于海水淡化，而且还有望用于废水处理和蛋白质或药物富集中的其他膜分离工艺。

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