Superhydrophobic Copper Foam Modified with n-Dodecyl Mercaptan-CeO2 Nanosheets for Efficient Oil/Water Separation and Oil Spill Cleanup

  • Ruixi Gao
    Ruixi Gao
    Low-carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
    More by Ruixi Gao
  • Xiang Liu
    Xiang Liu
    Low-carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
    More by Xiang Liu
  • Tian C. Zhang
    Tian C. Zhang
    Civil and Environmental Engineering Department, University of Nebraska-Lincoln, Omaha, Nebraska 68182-0178, United States
  • Like Ouyang
    Like Ouyang
    Low-carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
    More by Like Ouyang
  • Ying Liang
    Ying Liang
    College of Architecture and Environmental Engineering, Sichuan University, Chengdu 610065, P. R. China
    More by Ying Liang
  • , and 
  • Shaojun Yuan*
    Shaojun Yuan
    Low-carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
    *Email: [email protected]. Tel./Fax: +86-28-85405201.
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Cite this: Ind. Eng. Chem. Res. 2020, 59, 49, 21510–21521
Publication Date (Web):November 24, 2020
https://doi.org/10.1021/acs.iecr.0c04515
Copyright © 2020 American Chemical Society
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Abstract

Efficient separation of oil/water with a simple and low-cost method is of great importance for the treatment of oily wastewater. In the current study, a facile one-step electrodeposition method was used to fabricate highly dense CeO2 nanostructures on copper foam at a constant current density of 1.5 mA·cm–2 for 20 min, which exhibited excellent superhydrophobicity and superlipophilicity after surface modification with n-dodecyl mercaptan (NDM). The electrodeposition current density and time were systematically investigated to uncover influencing factors of the growth process of CeO2 nanostructures on the copper foam. The as-fabricated superhydrophobic foams could not only be used to efficiently separate oil/water mixtures with a separation efficiency greater than 97.4% but also presented robustness and high stability against 3.5 wt % NaCl solution and 600-grit sandpaper abrasion. Furthermore, the as-prepared sample still maintains a high separation efficiency at circa 97.5% after more than 25 times of recovery for kerosene/water mixture separation. In addition, the as-prepared three-dimensional cassette structure made of superhydrophobic copper foam could float freely on the water surface for fast in situ collection of oil from the water surface, indicating application potential in offshore oil spill treatment and cleanup.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.iecr.0c04515.

  • (Figure S1) Separation efficiencies of the original copper foam and NDM-copper foam, (Figure S2) water ejecting photographs of syringe impact testing, (Figure S3) oil absorption capacity of NDM-CeO2@copper foam toward five types of oils, (Figure S4) strain–stress curves of the original copper foam and NDM-CeO2@copper foam, and (Table S1) separation performance comparison of [email protected] copper foam with other previously reported copper foams for oil/water separation (PDF)

  • (Movie S1) Separation of an isooctane/water mixture with NDM-CeO2@copper foam (AVI)

  • (Movie S2) Continuous oil absorption experiment of NDM-CeO2@copper foam (AVI)

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