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Superhydrophilic and underwater superoleophobic nanofibrous membrane for separation of oil/water emulsions

Published online by Cambridge University Press:  15 June 2020

Jingjing Wang Open the ORCID record for Jingjing Wang [Opens in a new window]  and
Luming Wang
Jingjing Wang*
Affiliation:
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng224051, P.R. China
Luming Wang
Affiliation:
Engineering Center for Straw Ecological Building Materials of Jiangsu Province, Yancheng Institute of Technology, Yancheng224051, P.R. China
*
a)Address all correspondence to this author. e-mail: jjwang1@hotmail.com
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Abstract

Membranes with special wettability have attracted increasing interest for oil/water separation. Herein, the cellulose-based nanofibrous membrane was fabricated in an aqueous system by an electrospinning technique. The membrane was then modified successively through coating polydopamine and polyethyleneimine on the surface, which endowed the membrane with superhydrophilic and underwater superoleophobic character. The composition and morphology of the resultant membrane were characterized by attenuated total reflectance Fourier transform infrared spectra, X-ray photoelectron spectroscopy, and field-emission scanning electron microscope, respectively. Surfactant-stabilized oil-in-water emulsions were used to evaluate the separation performance of the membrane at different pH values. It was found that the membrane displayed the excellent antifouling property and separation performance for all different emulsions, with separation efficiency above 99.1% due to the development of a hydration layer underwater on the membrane surface. The reusability study indicated that the modification coating was stable enough to effectively separate emulsions after recycling at least 20 times. The developed nanofibrous membrane, as well as the corresponding modification strategy, enriched the application of membranes with special wettability in the field of oil spills and oily wastewater treatments.

Keywords

cellulosepoly (vinyl alcohol)nanofibrous membraneelectrospinningoil/water separation
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 12 , 29 June 2020 , pp. 1504 - 1513
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Copyright
Copyright © Materials Research Society 2020

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