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Journal of Materials Science

, Volume 53, Issue 14, pp 10025–10038 | Cite as

Facile preparation of novel hydrophobic sponges coated by Cu2O with different crystal facet structure for selective oil absorption and oil/water separation

  • Jiali Li
  • Zheng-Qing Huang
  • Chao Xue
  • Yuxin Zhao
  • Wenbin Hao
  • Guidong Yang
Chemical routes to materials
  • 285 Downloads

Abstract

In this work, a series of novel Cu2O@sponge composite materials including cubic Cu2O@sponges, octahedral Cu2O@sponges and cubo-octahedral Cu2O@sponges were prepared through a facile dip coating method to coat Cu2O particles on melamine sponge, all of which possess very highly hydrophobic and oleophilic properties. The crystal phase, microstructure and surface functional group of the as-prepared materials were characterized by X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectra. The effect of different crystal facet of Cu2O on contact angle, wettability and oil absorption was systematically investigated. Meanwhile, the DFT calculation results show that the surface energy has significant influence on the hydrophobic property of Cu2O, and the calculated surface energies of Cu2O (111) and Cu2O (100) crystal surface are 0.73 and 1.29 J/m2, respectively. On basis of the DFT calculations and experimental results, the octahedral Cu2O with eight (111) crystal facet-coated sponges has the highest hydrophobic properties with the contact angle of 149°, which therefore shows very high separation efficiency in oil/water separation and quickly absorbs floating oils on the water surface. Additionally, all the Cu2O@sponges composite materials indicate excellent oil absorption performances and reusability in terms of hydrophobicity and oil absorbency, which would provide new materials for the potential application of oil/water separation.

Notes

Acknowledgements

This work was financially supported by the Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2017JZ001), the National Natural Science Foundation of China (Grant No. 21303130) and the Fundamental Research Funds for the Central Universities (Grant No. cxtd2017004). Thanks for the technical support from International Center for Dielectric Research (ICDR), Xi’an Jiaotong University, Xi’an, China; the authors also appreciate Ms. Dai and Mr. Ma for their help in using SEM, EDX and TEM, respectively. We thank Professor Suitao Qi at Xi’an Jiaotong University for getting access to the software of Vienna Ab initio Simulation Package. The calculations were performed by using supercomputers at National Supercomputing Center in Shenzhen.

Compliance with ethical standards

Conflict of interest

The authors declare no competing financial interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemical Engineering, School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’anPeople’s Republic of China
  2. 2.State Key Laboratory of Safety and Control for ChemicalsSINOPEC Safety Engineering InstituteQingdaoPeople’s Republic of China

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