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Preparation of superhydrophobic magnetic stearic acid polyurethane sponge for oil–water separation

Published online by Cambridge University Press:  07 October 2020

Hui Liu ,
Sisi Su ,
Jiawen Xie ,
Yu Ma  and
Caihong Tao
Hui Liu
Affiliation:
School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou730070, P. R. China
Sisi Su
Affiliation:
School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou730070, P. R. China
Jiawen Xie
Affiliation:
School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou730070, P. R. China
Yu Ma
Affiliation:
School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou730070, P. R. China
Caihong Tao*
Affiliation:
School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou730070, P. R. China
*
a)Address all correspondence to this author. e-mail: taoch@mail.lzjtu.cn
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Abstract

Three-dimensional porous materials with the hydrophobic/oleophilic surface have attracted significant interest in the fields of oil/water separation. In this paper, superhydrophobic magnetic polyurethane sponge was fabricated by the self-polymerization of dopamine to bind the Fe3O4 nanoparticles tightly on the sponge and then soaking in cheap stearic acid aqueous solution. The obtained sponge has the superhydrophobic property and good magnetic property. The surface structure, composition, and properties of the modified sponges were characterized by scanning electron microscopy, energy dispersive spectrometer, Fourier-transform infrared spectrum, and water contact angle (WCA) measurements. The as-prepared superhydrophobic magnetic sponge was able to collect a wide range of oils and organic solvents from oil–water mixture with an absorption capacity up to 16–60 times of its own weight. Under an external magnetic field, it can be guided to a designated area. In addition, combined with the vacuum system, continuous oil separation can be carried out, which is of great significance for removing a good deal of dirty oil on the water surface. Furthermore, the WCA of sponge remains above 141°, and the oil absorption is basically unchanged through repeated cyclic experiments.

Keywords

absorptionmagneticsurface chemistry
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 21 , 16 November 2020 , pp. 2925 - 2935
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of Materials Research Society

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