Zhang Xu, Zeng Yong, Shen Chong, Fan Zixuan, Meng Qin, Zhang Weizhen, Zhang Guoliang, Gao Congjie
Center for Membrane and Water Science & Technology, Institute of Oceanic and Environmental Chemical Engineering, State Key Lab Breeding Base of Green Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, P. R. China.
College of Chemical and Biological Engineering, and State Key Laboratory of Chemical Engineering, Zhejiang University, Yugu Road 38#, Hangzhou 310027, P. R. China.
ACS Appl Mater Interfaces. 2021 Oct 20;13(41):48679-48690. doi: 10.1021/acsami.1c13801. Epub 2021 Oct 8.
The metal-organic framework (MOF)-based polyamide (PA) membranes applied for desalination with high permeability and selectivity are attracting more and more attention. However, the design and fabrication of high-quality and stable MOF-based PA nanocomposite reverse osmosis (RO) membrane still remain a big challenge. Herein, Fe-polyphenolic complex coating via interfacial coordination was first explored as an interlayer of an in situ assembled stable and high-quality Fe(BTC)-based PA nanocomposite RO membranes for desalination. Although depositing the Fe-polyphenolic complex on the polymer support, sufficient heterogeneous nucleation sites for the in situ synthesizing Fe(BTC) are provided. Using this strategy, we can not only facilely prepare continuous MOF-based PA nanocomposite RO membranes, ignoring the complicated and time-consuming co-blending process and the MOF-particle aggregation, but also restrict the formation of PA matrix inside the pores of the support membrane and increase the rigidity of the polyamide chain. The method also gives a proper level of generality for the fabrication of versatile stable MOF-based PA RO membranes on various supports. The prepared PA/Fe(BTC) composite membrane exhibited excellent separation performance with a large permeate flux of 2.93 L m h bar and a high NaCl rejection of 96.8%.
用于海水淡化的具有高渗透性和选择性的金属有机框架（MOF）基聚酰胺（PA）膜正吸引着越来越多的关注。然而，高质量且稳定的MOF基PA纳米复合反渗透（RO）膜的设计与制备仍然是一个巨大的挑战。在此，首次探索了通过界面配位的铁多酚复合物涂层作为原位组装稳定且高质量的基于Fe（BTC）的PA纳米复合RO膜用于海水淡化的中间层。虽然将铁多酚复合物沉积在聚合物载体上，但为原位合成Fe（BTC）提供了足够的异质成核位点。使用这种策略，我们不仅可以轻松制备连续的MOF基PA纳米复合RO膜，而无需考虑复杂且耗时的共混过程以及MOF颗粒的聚集，而且还能限制支撑膜孔内PA基质的形成并增加聚酰胺链的刚性。该方法对于在各种载体上制备通用稳定的MOF基PA RO膜也具有一定的通用性。制备的PA/Fe（BTC）复合膜表现出优异的分离性能，具有2.93 L m h bar的大渗透通量和96.8%的高NaCl截留率。
