Abstract The development of forward osmosis (FO) as a new technology for water desalination faces limitations mainly due to the selection and regeneration of the appropriate draw solution. In this study, the concept of using an oligo- deep eutectic solvent (DES) based on itaconic acid-choline chloride (IA-CC) as a draw solute in the sustainable FO process was introduced. The moderate molecular weight of oligomers can overcome the trade-off relationship of the water flux and reverse solute flux in the FO process. The average water flux of 1 g mL−1 oligo (IA1-CC1.5) solution was found to be 32.8 L m−2 h−1 (LMH) with the reverse solute flux of 1.4 g m−2 h−1 (gMH). The water regeneration from DES draw solutions was then carried out through the phase separation at 5 °C. To analyze the capability of the synthesized material as draw solution in desalination process, FO tests were performed using 0.6 and 1.0 M NaCl and also Caspian Seawater as the feed solutions, and 1 g mL−1 oligo (IA1-CC1.5 DES) as the draw solution, which the average water flux was found to be 14.5, 9.7, and 13.8 LMH, respectively.

中文翻译：

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通过低聚深共熔溶剂作为驱动溶质提高正向渗透性能

摘要 正渗透（FO）作为一种新的海水淡化技术的发展面临限制，主要是由于合适的驱动溶液的选择和再生。在本研究中，引入了使用基于衣康酸-氯化胆碱 (IA-CC) 的低聚深共熔溶剂 (DES) 作为可持续 FO 工艺中的驱动溶质的概念。低聚物的中等分子量可以克服FO过程中水通量和反向溶质通量的权衡关系。发现 1 g mL-1 oligo (IA1-CC1.5) 溶液的平均水通量为 32.8 L m-2 h-1 (LMH)，反向溶质通量为 1.4 gm-2 h-1 (gMH) . 然后在 5°C 下通过相分离从 DES 驱动溶液中再生水。