Journal
APPLIED SURFACE SCIENCE
Volume 440, Issue -, Pages 535-546Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.01.177
Keywords
Nature-inspired polyphenol chemistry; Hierarchical structure; Superhydrophobicity; Oil-water separation
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Funding
- National Key Research and Development Program of China [2016YFA0101102]
- Educational Commission of Hubei Province [Q20151606]
- National Engineering Laboratory for Advanced Textile Processing and Clean Production of China [GCSYS201703]
- Foundation of Wuhan Textile University
- State Key Laboratory for Hubei New Textile Materials and Advanced Processing Technology [ZDSYS201706]
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With the ever-increasing oil spillages, oil-water separation has attracted widespread concern in recent years. In this work, a nature-inspired polyphenol method has been developed to fabricate the durable superhydrophobic surfaces for the oil-water separation. Inspiring from the adhesion of polyphenol and reducing capacity of free catechol/pyrogallol groups in polyphenol, firstly, the simple immersion of commercial materials (melamine sponge, PET, and nonwoven cotton fabrics) in tannic acid (TA) solution allows to form a multifunctional coating on the surface of sponge or fabrics, which was used as reducing reagent to generate Ag nanoparticles (NPs). Then, decoration of 1H, 1H, 2H, 2H-perfluorodecanethiol (PFDT) molecules produced superhydrophobic surfaces. The surface topological structure, chemical composition, and superhydrophobic property of the as-prepared surface are characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy dispersive spectroscopy (EDS), and water contact angle (WCA) measurements. The WCAs of as-prepared sponge and fabrics were higher than 150 degrees. The stability, absorption capacity, and recyclability of as-prepared sponge and fabrics were investigated. The as-prepared sponge demonstrates high oil/water selectivity and high absorption capacity (66-150 g/g) for a broad variety of oils and organic solvents, and was chemically resistant, robust against abrasion, and long-term durability in harsh environments. Most important of all, it can continuously separate various kinds of oils or organic pollutants from the surface of water. This study presents a facile strategy to fabricate superhydrophobic materials for continuous oil-water separation, displaying great potential in large-scale practical application. (C) 2018 Elsevier B.V. All rights reserved.
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