Liang Jingyi, Huang Hansheng, Zhang Hao, Wu Yanhui, Zhuang Yongbing
School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China.
Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, China.
Membranes (Basel). 2023 Jul 24;13(7):688. doi: 10.3390/membranes13070688.
To explore the application of forward osmosis (FO) technology in the organic solvent recovery field, we prepared a new solvent-resistant triple layer thin film composite (TFC) membrane on the PI (polyimide) substrate. The deep eutectic supramolecular polymers (DESPs) interlayer was constructed on the substrate to improve the separation performance and solvent resistance. DESPs interlayer was formed by mixing and heating with cyclodextrin as the hydrogen bond acceptor and -malic acid as the hydrogen bond donor. The chemical changes, surface property and morphology of the composite membrane with DESPs interlayer were characterized. The separation performance and stability of the triple layer composite membrane in organic solvent FO were studied. For the monascorubrin-ethanol system, the permeation flux of TFC/DESPs5-PI membrane could reach 9.51 LMH while the rejection rate of monascorubrin was 98.4% (1.0 M LiCl/ethanol as draw solution), which was better than the pristine membrane. Therefore, this solvent-resistant triple layer composite FO membrane has good potential for the recovery of organic solvents.
为了探索正向渗透(FO)技术在有机溶剂回收领域的应用,我们在聚酰亚胺(PI)基底上制备了一种新型的耐溶剂三层复合薄膜(TFC)膜。在基底上构建了深共晶超分子聚合物(DESPs)中间层,以提高分离性能和耐溶剂性。DESPs中间层通过以环糊精作为氢键受体、苹果酸作为氢键供体进行混合和加热形成。对具有DESPs中间层的复合膜的化学变化、表面性质和形态进行了表征。研究了三层复合膜在有机溶剂正向渗透中的分离性能和稳定性。对于红曲红素 - 乙醇体系,TFC/DESPs5-PI膜的渗透通量在以1.0 M LiCl/乙醇作为汲取液时可达9.51 LMH,而红曲红素的截留率为98.4%,优于原始膜。因此,这种耐溶剂三层复合正向渗透膜在有机溶剂回收方面具有良好的潜力。