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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

Postal Subscription Code 80-974

2018 Impact Factor: 1.701

Front. Mater. Sci.    2019, Vol. 13 Issue (2) : 193-205    https://doi.org/10.1007/s11706-019-0461-4
RESEARCH ARTICLE
Sprayable and rapidly bondable phenolic-metal coating for versatile oil/water separation
Heling GUO1, Xiaolin WANG1, Xie LI1, Xiulan ZHANG1, Xinghuan LIU1, Yu DAI1, Rongjie WANG1, Xuhong GUO2, Xin JIA1()
1. School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region, Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, China
2. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
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Abstract

Phenolic-metal complexation coatings have been discovered to be a universal route for the deposition of multifunctional coatings. However, most complexation coatings have been prepared by the immersion method, which limits their practical large-scale application. Herein, we describe a facile and green engineering strategy that involves spraying phenolic compound and metal ions on substrate to form in-situ complexation coating with different coordination states. The coating is formed within minutes and it can be achieved in large scale by the spray method. The pyrogallol-FeIII complexation coating is prepared at pH 7.5, which consists predominantly of bis-coordination complexation with a small amount of tris-coordination complexation. It displays that the water contact angle is near zero due to the generation of rough hierarchical structures and massive hydroxyl groups. The superhydrophilic cotton resulting from the deposition of the pyrogallol-FeIII complexation can separate oil/water mixtures and surfactant-stabilized oil-in-water emulsions with high separation efficiency. The formation of the phenolic-metal complexation coating by using spray technique constitutes a cost-effective and environmentally friendly, strategy with potential to be applied for large-scale surface engineering processes and green oil/water separation.

Keywords spray coating      in-situ complexation      superhydrophilicity      oil/water separation      surface engineering     
Corresponding Author(s): Xin JIA   
Online First Date: 30 May 2019    Issue Date: 19 June 2019
 Cite this article:   
Heling GUO,Xiaolin WANG,Xie LI, et al. Sprayable and rapidly bondable phenolic-metal coating for versatile oil/water separation[J]. Front. Mater. Sci., 2019, 13(2): 193-205.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-019-0461-4
https://academic.hep.com.cn/foms/EN/Y2019/V13/I2/193
Fig.1  Scheme 1 Schematic illustration and reaction mechanism for the preparation of superhydrophilic PG-FeIII coating. Spray coating is performed by pouring PG, FeCl3·6H2O and NaOH solutions into different vessels of a three-channel sprayer, where the solutions are mixed and onto surface.
Fig.2  pH-Dependence of the PG-FeIII complexation state: (a) UV–vis spectra of the PG-FeIII complexation at various pH values; (b) thickness values of the PG-FeIII complexation coating after 10 spray cycles; (c) AFM images of the coated PC substrate surfaces; (d) WCAs of the cotton surface after 10 spray cycles; (e) the reaction mechanism of the PG-FeIII complexation at different pH values.
Fig.3  Wettability and water permeability of the PG-FeIII complexation (at pH 7.5)-coated cotton: (a)(b) contact angle photographs of complexation-coated cotton for water droplet in air and oil droplet under water; (c) water permeability of the coated cotton.
Fig.4  (a)(b) SEM and (c)(d) AFM images of cotton surfaces for the original cotton (upper) and the PG-FeIII complexation (at pH 7.5)-coated cotton (lower).
Fig.5  (a)(b) Mappings of surface chemical compositions of the original cotton and the PG-FeIII complexation (at pH 7.5)-coated cotton. (c) XPS survey spectra. (d) High-resolution XPS images of Fe 2p.
Fig.6  (a) Schematic illustration of the separation of oil/water mixtures. (b) Photographs of the oil separated from oil/water mixture by the PG-FeIII complexation (at pH 7.5)-coated cotton. (c) The separation capacity of the coated cotton for various organic liquids. (d) The separation efficiency after several separations.
Fig.7  (a) Schematic illustration of the separation of oil-in-water emulsion. (b) Water flux for the separation of the toluene-in-water emulsion by using different complexation-coated cottons. (c)(d) The separation performance of toluene-in-water emulsion by using PG-FeIII complexation coated cotton.
  Fig. S1(a) A lab-made three-channel tool for the spray coating method. (b) A photograph of unmodified (left) and PG-FeIII complexation (at pH 7.5)-coated (right) cotton with an area of 25 cm × 20 cm.
  Fig. S2(a) UV–vis absorption spectra of different phenolic-FeIII at pH 7.5. (b) The thickness of the phenolic-FeIII complexation coating after 10 spray cycles. (c)(d) AFM images of the coated PC substrate surfaces.
  Fig. S3(a) UV–vis spectra of different metal-PG complexation at pH 7.5. (b) The thickness of the metal-PG complexation coating after 10 spray cycles. (c)(d) AFM images of coated PC substrate surfaces.
  Fig. S4 Mappings of PG-CaII, PG-CuII and PG-MgII coatings on the PC substrate.
  Fig. S5 Wettabilities of different phenolic-metal complexation-coated cottons.
  Fig. S6 The water droplet image of surfaces for the original cotton and the superhydrophilic PG-FeIII complexation-coated cotton.
  Fig. S7 Element concentrations of the PG-FeIII complexation-coated cotton determined by the EDS analysis.
  Fig. S8 Schematic diagram of the emulsion separation device.
  Fig. S9 Optical microscopy images, photographs and DLS data of the feed emulsions (up) and their filtrate correspondingly (down) for surfactant-stabilized emulsions of S-2 (chloroform-in-water) and S-3 (hexane-in-water).
Oil Density/(g·cm−3) Viscositya)/(mPa·s)
Toluene 0.866 0.587
Chloroform 1.498 0.563
Hexane 0.659 0.307
  Table S1 Densities and viscosities of oils used in the oil/water separation of this work
Acronym of the emulsion Oil V(oil)/mL V(water)/mL w(emulsifiera))/g
1 toluene 20 80 0.97
2 chloroform 20 80 1.1
3 hexane 20 80 0.94
  Table S2 Acronyms of various emulsions and their compositions
Cotton sample Atomic concentration/%
C O Fe
Original 74.54 25.36 0
PG-FeIII complexation-coated 71.48 28.08 0.44
  Table S3 Element concentrations determined by the XPS analysis
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