Ning Doudou, Lu Zhaoqing, Hua Li, Zhang Xinyi, Li Nan, Huang Kaiyue, E Songfeng
College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, 710021, China.
Small. 2024 Oct;20(40):e2402284. doi: 10.1002/smll.202402284. Epub 2024 May 27.
2D lamellar nanofiltration membrane is considered to be a promising approach for desalinating seawater/brackish water and recycling sewage. However, its practical feasibility is severely constrained by the lack of durability and stability. Herein, a ternary nanofiltration membrane via a mixed-dimensional assembly of 2D boron nitride nanosheets (BNNS) is fabricated, 1D aramid nanofibers (ANF), and 2D covalent organic frameworks (COF). The abundant 2D and 1D nanofluid channels endow the BNNS/ANF/COF membrane with a high flux of 194 L·m·h. By the synergies of the size sieving and Donnan effect, the BNNS/ANF/COF membrane demonstrates high rejection (among 98%) for those dyes whose size exceeds 1.0 nm. Moreover, the BNNS/ANF/COF membrane also exhibits remarkable durability and mechanical stability, which are attributed to the strong adhesion and interactions between BNNS, ANF, and COF, as well as the superior mechanical robustness of ANF. This work provides a novel strategy to develop robust and durable 2D lamellar nanofiltration membranes with high permeance and selectivity simultaneously.
二维层状纳滤膜被认为是一种用于海水/微咸水脱盐和污水回用的有前景的方法。然而，其实际可行性受到耐久性和稳定性不足的严重限制。在此，通过二维氮化硼纳米片（BNNS）、一维芳纶纳米纤维（ANF）和二维共价有机框架（COF）的混合维度组装制备了一种三元纳滤膜。丰富的二维和一维纳米流体通道赋予BNNS/ANF/COF膜194 L·m⁻²·h⁻¹的高通量。通过尺寸筛分和唐南效应的协同作用，BNNS/ANF/COF膜对尺寸超过1.0 nm的染料表现出高截留率（高达98%）。此外，BNNS/ANF/COF膜还表现出显著的耐久性和机械稳定性，这归因于BNNS、ANF和COF之间的强粘附力和相互作用，以及ANF优异的机械坚固性。这项工作为同时开发具有高渗透性和选择性的坚固耐用的二维层状纳滤膜提供了一种新策略。
