Wang Yi, Nie Yuqi, Chen Chunhong, Zhao Hongjie, Zhao Ye, Jia Yujin, Li Jun, Li Zhanguo
State Key Lab of NBC Protection for Civilian, Beijing 102205, China.
Department of Military Installation, Army Logistics Academy of PLA, Chongqing 401331, China.
Membranes (Basel). 2022 Mar 28;12(4):368. doi: 10.3390/membranes12040368.
MXene nano-sheets were introduced into a thin-film composite membrane (TFC) to reduce the mass transfer resistance (concentration polarization) and improve the membrane performance. The process entailed dissolving the MXene nano-sheets in a membrane casting solution using the blending method and introducing them into the porous support layer to prepare a modified thin-film composite forward osmosis (TFC-FO) membrane. The results showed that the water contact angle decreased by about 16%, indicating that the hydrophilicity was strengthened, and the O/N ratio of the active selective layer decreased by 13%, indicating an increased degree of crosslinking, thereby demonstrating that the introduction of MXene nano-sheets changed the properties of the membrane and played a positive role in its physicochemical properties. In contrast to the unmodified TFC-FO membrane, the modified membrane had a slightly higher reverse solute flux, while its water flux increased by about 80%. Its specific reverse osmosis flux was also significantly optimized (only 0.63 g/L). In conclusion, adding MXene nanosheets to TFC-FO membranes led to the modified membranes with better mass transfer, lessened internal concentration polarization (ICP), and better osmotic separation.
将MXene纳米片引入到薄膜复合膜（TFC）中，以降低传质阻力（浓差极化）并改善膜性能。该过程包括使用共混法将MXene纳米片溶解在制膜溶液中，并将其引入多孔支撑层以制备改性的薄膜复合正渗透（TFC-FO）膜。结果表明，水接触角降低了约16%，表明亲水性增强，活性选择层的O/N比降低了13%，表明交联程度增加，从而证明MXene纳米片的引入改变了膜的性质，并对其物理化学性质起到了积极作用。与未改性的TFC-FO膜相比，改性膜的反向溶质通量略高，而其水通量增加了约80%。其比反渗透通量也得到了显著优化（仅为0.63 g/L）。总之，向TFC-FO膜中添加MXene纳米片可使改性膜具有更好的传质性能，减少内部浓差极化（ICP），并具有更好的渗透分离性能。
