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Biological and Environmental Phenomena at the Interface
Bio-inspired peptide-coated superhydrophilic poly(vinylidene fluoride) membrane for oil/water emulsion separation Weiming Wu, Renliang Huang, Wei Qi, Rongxin Su, and Zhimin He Langmuir, Just Accepted Manuscript • DOI: 10.1021/acs.langmuir.8b01017 • Publication Date (Web): 11 May 2018 Downloaded from http://pubs.acs.org on May 14, 2018
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Langmuir
Bio-inspired peptide-coated superhydrophilic poly(vinylidene fluoride) membrane for oil/water emulsion separation
Weiming Wu,† Renliang Huang,*,‡ Wei Qi,*, †, §, # Rongxin Su†, §, # and Zhimin He†
†
State Key Laboratory of Chemical Engineering, School of Chemical Engineering
and Technology, Tianjin University, Tianjin 300072, P. R. China ‡
Tianjin Key Laboratory of Indoor Air Environmental Quality Control, School of
Environmental Science and Engineering, Tianjin University, Tianjin 300072, P. R. China §
Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, P. R. China
#
Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, P. R. China
* Author to whom any correspondence should be addressed E-mail:
[email protected] (R. H.),
[email protected] (W. Q.) Tel: +86 22 27407799. Fax: +86 22 27407599.
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ABSTRACT Polyvinylidene fluoride (PVDF) membranes are limited in the field of oil-in-water emulsion treatment because the intrinsic hydrophobicity of PVDF can cause serious membrane fouling. Here, a superhydrophilic PVDF membrane (PVDF@PDA-GSH) was fabricated using a facile, versatile, mussel-inspired method. The pristine PVDF membrane was coated with dopamine under mild alkaline conditions by a dip-coating method, followed by addition of glutathione (GSH) via a simple reaction. GSH was successfully coated onto the membrane surface and confirmed by X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectrometry (EDX). Hierarchical surface structure and superhydrophilicity were examined by scanning electron microscopy (SEM) and contact angle (CA), respectively, giving the PVDF@PDA-GSH membrane excellent wettability and antifouling ability. The water flux of PVDF@PDA-GSH was several fold higher than conventional filtration membranes, and the oil rejection ratio was nearly 99%. The PVDF@PDA-GSH membrane also showed favorable reusability because the flux recovery ratio (FRR) remained above 90% after five cycles. In general, these results indicated that this modification might provide a good method for the fabrication of superhydrophilic PVDF membranes with good prospects for water filtration applications.
Key words: Polyvinylidene fluoride, superhydrophilicity, dopamine, peptide, oil-water separation, emulsion
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INTRODUCTION Every year, a large amount of oily wastewater is produced by frequent oil spills and industrial processes, including petrochemical, transportation, food, textile and metallurgical processing.1 Oily wastewater seriously endangers the environment, natural landscapes and human health.2-3 Oil in water, generally speaking, is classified as floated oil (Dp >100 µm), dispersed oil (Dp=100—10 µm), emulsified oil (Dp
