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Biomineralization-mimetic Preparation of Hybrid Membranes with Ultra-high Load of Pristine Metal-Organic Frameworks Grew on Silk Nanofibers for Hazards Collection in Water

Abstract

Efficient incorporation of porous material with membrane to prepare hybrid membrane has been promising yet challenging to develop separation device for water pollution treatment. Metal-organic frameworks (MOFs) possess superior adsorbability, but their poor processability hamper the fabrication of device for applications. Inspired by biomineralization, we propose the preparation of electrospun-silk-nanofiber (ESF)@MOFs (ZIF-8 or ZIF-67) hybrid membranes with pristine MOFs densely loaded to efficiently remove pollutants in water. The biomineralization-mimetic in-situ growth of MOFs on ESF led to perfect coverage of MOFs, with loading rates reaching 36% and 34% for ZIF-8 and ZIF-67, respectively, which were among the highest level of that for commonly used polymer membranes and reported analogues. The loaded MOFs also retained porosity being comparable with pristine MOFs. Dynamic investigations revealed that the superior loading rates and porosity derived from the abundant nucleation sites provided by the ESF and the biomineralization-manner growth. The hybrid membranes achieved removal rates reaching nearly 100% to two kinds of heavy metal ions and organic dyes. A filtration device was also constructed with removal rate being close to 100% in one round. The proposed biomineralization-mimetic growth of MOFs on biomolecular matrices might create new way for the preparation of multi-functional MOFs-based devices.

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Publication details

The article was received on 06 Aug 2017, accepted on 30 Nov 2017 and first published on 05 Dec 2017


Article type: Paper
DOI: 10.1039/C7TA06924C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Biomineralization-mimetic Preparation of Hybrid Membranes with Ultra-high Load of Pristine Metal-Organic Frameworks Grew on Silk Nanofibers for Hazards Collection in Water

    Z. Li, G. Zhou, H. Dai, M. Yang, Y. Fu, Y. Ying and Y. Li, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06924C

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