Noncovalent Complex Modulated Fabrication of COF Membrane for Organic Solvent Nanofiltration

IF 12.1 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Small Pub Date : 2025-03-09 DOI:10.1002/smll.202500927

Wang Baoyu, Zhang Shiyu, Liu Zhe, Ding Cuiting, Deng Hao, Zheng Yu, Ding Rui, Zhang Runnan, Zhang Sui, Jiang Zhongyi

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Abstract

Covalent organic framework (COF) has been recognized as a disruptive material for fabricating organic molecular sieve membranes. Acquiring crystalline and defect-free COF membranes directly on polymeric substrates is important for practical applications yet is highly challenging. In this study, a noncovalent complex (NCX) modulated fabrication of COF membrane on hydrolyzed polyacrylonitrile (HPAN) substrate via counter diffusion is proposed. The triaminoguanidine chloride-phytic acid noncovalent complex (Tg-PA NCX) is uniformly introduced onto the HPAN substrate, transferring the substrate into an ideal seeding layer and catalytic platform for COF nucleation and growth. Enhanced Tg monomer concentration derived from NCX enhance its concentration near the surface is observed, facilitating the heterogeneous nucleation for COF fabrication. In addition, the PA in the NCX acted as a catalyst, promoting the growth of the highly crystalline COF membrane afterward. The resulting TgTb/NCX/HPAN membrane shows a defect-free surface with high crystallinity. Also, it displays over 90% rejection to various dyes rejection rates (e.g., Evans blue, Methyl blue, Congo red, and Amido Black) and high solvent permeation for organic solvents (e.g., ethanol: 57.9 ± 2.1 L m⁻²h⁻¹ bar⁻¹, n-hexane: 215.0 ± 2.7 L m⁻²h⁻¹ bar⁻¹). This work holds great potential as a platform technology for fabricating high-performance organic molecular sieve membranes.

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非共价络合物调制制备有机溶剂纳滤用COF膜

共价有机框架（COF）已被认为是制造有机分子筛膜的颠覆性材料。直接在聚合物基底上获得结晶且无缺陷的 COF 膜对于实际应用非常重要，但却极具挑战性。本研究提出了一种通过反向扩散在水解聚丙烯腈（HPAN）基底上制造 COF 膜的非共价复合物（NCX）调制方法。氯化三氨基胍-phytic酸非共价复合物（Tg-PA NCX）被均匀地引入到 HPAN 基底上，使基底成为 COF 成核和生长的理想播种层和催化平台。观察到 NCX 增强了 Tg 单体浓度，提高了其在表面附近的浓度，促进了 COF 制造的异质成核。此外，NCX 中的 PA 起到了催化剂的作用，促进了随后高结晶 COF 膜的生长。制得的 TgTb/NCX/HPAN 膜表面无缺陷，结晶度高。此外，它对各种染料（如伊文思蓝、甲基蓝、刚果红和阿米多黑）的抑制率超过 90%，对有机溶剂（如乙醇：57.9 ± 2.1 L m-2h-1 bar-1，正己烷：215.0 ± 2.7 L m-2h-1 bar-1）的溶剂渗透率也很高。这项工作作为制造高性能有机分子筛膜的平台技术，具有巨大的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.