Zhang Xinliang, Zhao Xueting, Sun Jinshan, He Yubin, Wu Bin, Ge Liang, Pan Jiefeng
College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China.
CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, PR China.
Water Res. 2025 Apr 15;274:123073. doi: 10.1016/j.watres.2024.123073. Epub 2024 Dec 30.
Membrane technology is an important component of resource recovery. Covalent organic frameworks (COFs) with inherent long-range ordered structure and permanent porosity are ideal materials for fabricating advanced membrane. Zwitterionic COFs have unique features beyond single ionic COFs containing anions or cations. Here, a zwitterionic colloidal 2D-COF (TpPa-Py) is synthesized via a single-phase method. ultrathin zwitterionic COF membranes are fabricated via a facile blade-coating method. Experimental and molecular dynamics simulation results showed that due to the unique amphiphilic nature of the TpPa-Py, the TpPa-Py membrane exhibits high level permeance and rejection of both positively and negatively charged dyes. Moreover, the TpPa-Py membrane exhibits excellent dye/dye and dye/salt separation performance. The selectivity factors were 89 for the separation of acid blue and rhodamine B, and 47.8 for the separation of methyl blue and NaCl. This work provides a promising solution for the development of high-performance membranes tailored for resource recovery of dye wastewater, addressing a critical need in water treatment.
膜技术是资源回收的重要组成部分。具有固有长程有序结构和永久孔隙率的共价有机框架（COF）是制备先进膜的理想材料。两性离子COF具有超越含阴离子或阳离子的单一离子COF的独特特性。在此，通过单相法合成了一种两性离子胶体二维COF（TpPa-Py）。通过简便的刮涂法制备了超薄两性离子COF膜。实验和分子动力学模拟结果表明，由于TpPa-Py独特的两亲性质，TpPa-Py膜对带正电和带负电的染料均表现出高水平的渗透率和截留率。此外，TpPa-Py膜表现出优异的染料/染料和染料/盐分离性能。酸性蓝和罗丹明B分离的选择性因子为89，甲基蓝和NaCl分离的选择性因子为47.8。这项工作为开发用于染料废水资源回收的高性能膜提供了一个有前景的解决方案，满足了水处理中的关键需求。
