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Mixed Nanosheet Membranes Assembled from Chemically Grafted Graphene Oxide and Covalent Organic Frameworks for Ultra-High Water Flux.

08:00 EDT 23rd July 2019 | BioPortfolio

Summary of "Mixed Nanosheet Membranes Assembled from Chemically Grafted Graphene Oxide and Covalent Organic Frameworks for Ultra-High Water Flux."

2D Graphene oxide (GO) membranes attract great attention due to ultrathin thickness and superior molecular sieving ability, but the low flux and instability in aqueous environments remain the major challenges for practical applications. In this study, we designed hybrid nanosheets from chemically grafted graphene oxide and -NH2 functionalized covalent organic frameworks (COFs) as building blocks to fabricate mixed nanosheet membranes. The GO-CTF membranes show layered configuration of ca. 32 nm thickness with similar interlayer distance as GO, ensuring high rejections to organic dyes (>90%); meanwhile, the CTF nanosheets affords extra through-plane channels that significantly shorten the water transport pathway. The GO-CTF membranes exhibit a water flux of 226.3 L m-2 h-1 bar-1, over 12-fold higher than pure GO membranes. Besides, the chemical bonds between GO and COF render the GO-CTF membranes notably enhanced stability. This approach opens a new avenue to fabrication of 2D membranes with promising application potential.

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This article was published in the following journal.

Name: ACS applied materials & interfaces
ISSN: 1944-8252
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