Forward osmosis (FO) is promising as an alternative to conventional pressure-driven membrane processes for water separation. Ideally, the draw solution (DS) for the FO process should have high osmotic pressure, easy reusability, and low reverse solute flux. In this study, novel CO₂/temperature dual-responsive dendrimers were prepared, and their performance as DSs were evaluated. Aqueous solutions of the synthesized dendrimers showed the lower critical solution temperature (LCST) type phase separation at moderate temperature. Therefore, the dendrimers could be easily recovered from the aqueous solution and reused as DS. Moreover, the dendrimer solutions showed high osmotic pressure after CO₂ absorption owing to the tertiary amine groups of the dendrimer, which could generate bicarbonate ions via neutralization reaction. Additionally, the dendrimer solution showed a low reverse solute flux through the FO membrane because of the branched structure of the dendrimers. Owing to the preferable properties of the CO₂/temperature dual-responsive dendrimers as the DS, the aqueous solution of the dendrimer showed high DS performance. This study demonstrated that CO₂/temperature dual-responsive dendrimers are potential candidates for constituting high-performance DSs.

正向渗透 (FO) 有望替代传统的压力驱动膜工艺进行水分离。理想情况下，FO 工艺的汲取溶液 (DS) 应具有高渗透压、易于重复使用和低反向溶质通量。在这项研究中，制备了新型CO ₂ /温度双响应树枝状大分子，并评估了它们作为DSs的性能。合成树枝状大分子的水溶液在中等温度下表现出较低的临界溶解温度 (LCST) 型相分离。因此，树枝状大分子可以很容易地从水溶液中回收并作为 DS 再利用。_{此外，树枝状大分子溶液在 CO 2}后显示出高渗透压由于树枝状大分子的叔胺基团可以通过中和反应产生碳酸氢根离子。此外，由于树枝状大分子的分支结构，树枝状大分子溶液显示通过 FO 膜的低反向溶质通量。由于CO ₂ /温度双响应树枝状大分子作为DS的良好性能，树枝状大分子的水溶液表现出较高的DS性能。该研究表明，CO ₂ /温度双响应树枝状大分子是构成高性能DS的潜在候选者。