Super-hydrophilic membranes fabricated by synergistic integration of covalent organic framework nanoflowers and hydrophilic layers for efficient oil-water separation

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2024-09-10 DOI:10.1016/j.desal.2024.118095

Baoliang Dai, Yidan Ding, Cheng Chen, Liguo Shen, Die Ling Zhao, Yang Jiao, Hongjun Lin, Yanchao Xu

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引用次数: 0

Abstract

Despite numerous advancements, the development of super-hydrophilic membranes for efficient oil-water separation remains a significant challenge due to issues such as membrane fouling and the trade-off between selectivity and permeability. This study addresses these issues by innovatively integrating covalent organic framework nanoflowers with hydrophilic layers of polydopamine and polyethylene glycol. The research introduces a novel membrane, DP/COF₃/PVDF, fabricated through a layer-by-layer self-assembly process and subsequent co-deposition of dopamine and PEG, which combines the nanostructured COF with a hydrophilic coating. Experimental results reveal that the optimized membrane exhibits remarkable hydrophilicity, with a water contact angle of 17.0° and an underwater oil contact angle of 176.9°. Notably, the membrane achieves an impressive pure water flux of 3919.9 L m⁻² h⁻¹ bar⁻¹ and a rejection rate exceeding 98.0 % across various oil-water emulsions, significantly outperforming traditional membranes. The membrane exhibits superior antifouling capabilities and stability over ten cycles of use, with negligible flux decline and consistent rejection rates, showcasing robust durability and reusability. This study's findings highlight the potential for developing next-generation super-hydrophilic membranes with improved oil-water separation efficiency and durability.

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通过共价有机框架纳米花和亲水层的协同整合制造超亲水膜，实现高效油水分离

尽管取得了诸多进展，但由于膜堵塞以及选择性和渗透性之间的权衡等问题，开发用于高效油水分离的超亲水膜仍是一项重大挑战。本研究通过创新性地将共价有机框架纳米流体与聚多巴胺和聚乙二醇亲水层结合在一起，解决了这些问题。研究介绍了一种新型膜--DP/COF3/PVDF，它是通过逐层自组装工艺以及随后的多巴胺和聚乙二醇共沉积工艺制成的，将纳米结构的 COF 与亲水涂层结合在一起。实验结果表明，优化后的膜具有显著的亲水性，水接触角为 17.0°，水下油接触角为 176.9°。值得注意的是，该膜的纯水通量达到了令人印象深刻的 3919.9 L m-2 h-1 bar-1，在各种油水乳液中的排斥率超过 98.0%，明显优于传统膜。在十次循环使用过程中，该膜表现出卓越的防污能力和稳定性，通量下降可忽略不计，剔除率始终如一，显示出强大的耐用性和可重复使用性。这项研究的结果凸显了开发具有更高油水分离效率和耐用性的下一代超级亲水膜的潜力。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.