MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
Angew Chem Int Ed Engl. 2023 Jun 5;62(23):e202302931. doi: 10.1002/anie.202302931. Epub 2023 Apr 27.
Two-dimensional graphene oxide (GO) membranes are gaining popularity as a promising means to address global water scarcity. However, current GO membranes fail to sufficiently exclude angstrom-sized ions from solution. Herein, a de novo "posterior" interfacial polymerization (p-IP) strategy is reported to construct a tailor-made polyamide (PA) network in situ in an ultrathin GO membrane to strengthen size exclusion while imparting a positively charged membrane surface to repel metal ions. The electrostatic repulsion toward metal ions, coupled with the reinforced size exclusion, synergistically drives the high-efficiency metal ion separation through the synthesized positively charged GO framework (PC-GOF) membrane. This dual-mechanism-driven PC-GOF membrane exhibits superior metal ion rejection, anti-fouling ability, good operational stability, and ultra-high permeance (five times that of pristine GO membranes), enabling a sound step towards a sustainable water-energy-food nexus.
二维氧化石墨烯（GO）膜作为解决全球水资源短缺问题的一种很有前途的手段正受到广泛关注。然而，目前的 GO 膜无法有效地将埃米大小的离子从溶液中排除。在此，报道了一种全新的“后”界面聚合（p-IP）策略，用于在超薄 GO 膜中就地构建定制的聚酰胺（PA）网络，以增强尺寸排阻，同时赋予带正电荷的膜表面以排斥金属离子。金属离子的静电排斥，加上增强的尺寸排阻，协同作用通过合成的带正电荷的 GO 骨架（PC-GOF）膜推动高效的金属离子分离。这种双机制驱动的 PC-GOF 膜表现出优异的金属离子截留率、抗污能力、良好的运行稳定性和超高的渗透性（是原始 GO 膜的五倍），为可持续的水-能源-食品关系迈出了坚实的一步。
