Channel–molecule attraction mediated molecule transport in confined nanochannels of COF membranes for nanofiltration

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2024-12-24 DOI:10.1002/aic.18719

Ruilong Li, Yongjian Yang, Jingjing Chen, Chongchong Chen, Wenpeng Li, Xiaoli Wu, Jingtao Wang

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Abstract

Porous membranes, a type of material widely used in nanofiltration, are confronted with the limitation that the influence of channel–molecule interactions on transport behaviors has yet been investigated in detail. Herein, covalent organic framework membranes with adjustable pore sizes (⁓ 2.5 nm and ⁓ 1.2 nm) and chemical groups (−F, −OH, and −CO−) were prepared by interfacial polymerization. We demonstrate that strong channel–molecule attraction induces the formation of stable solvent layers along nanochannel walls, which protect central molecules from the attraction of chemical groups. Significantly, stable solvent layers permit fast transport of ethanol (245.6 L m⁻² h⁻¹ bar⁻¹) with reactive black (RB) rejection of 96%. Likely, for membranes with weak channel–molecule attraction, no solvent layers are formed and molecules also transport smoothly. Interestingly, membranes that exhibit moderate channel–molecule attraction exert metastable solvent layers, thus displaying high transport resistance. This hindrance effect on molecule transport becomes more pronounced in smaller nanochannels.

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通道-分子吸引介导的COF膜纳米通道内的分子运输

多孔膜是一种广泛应用于纳滤的材料，但由于通道-分子相互作用对其传输行为的影响尚未得到详细的研究，因此存在一定的局限性。本文采用界面聚合法制备了孔径可调（⁓2.5 nm和⁓1.2 nm）、化学基团可调（−F、−OH和−CO−）的共价有机骨架膜。我们证明了强大的通道-分子吸引力诱导沿纳米通道壁形成稳定的溶剂层，从而保护中心分子免受化学基团的吸引。值得注意的是，稳定的溶剂层允许乙醇快速运输（245.6 L m−2 h−1 bar−1），活性黑（RB）的去除率为96%。很可能，对于具有弱通道-分子吸引力的膜，没有形成溶剂层，分子也能顺利运输。有趣的是，表现出适度通道-分子吸引力的膜施加亚稳溶剂层，从而表现出高的运输阻力。在更小的纳米通道中，这种对分子运输的阻碍作用变得更加明显。

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

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.

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