University of Oulu

Jiefeng Meng, Feng Li, Taohai Li, Wei Cao, Coating polyurethane sponge with Dy-MOF for efficient oil–water separation in complex environments, Applied Surface Science, Volume 614, 2023, 156183, ISSN 0169-4332,

Coating polyurethane sponge with Dy-MOF for efficient oil–water separation in complex environments

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Author: Meng, Jiefeng1; Li, Feng1,2; Li, Taohai1,2;
Organizations: 1College of Chemistry, Key Lab of Environment Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan 411105, China
2Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 7.8 MB)
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Language: English
Published: Elsevier, 2022
Publish Date: 2023-01-12


Leakage of industrial oil and organic solvents seriously harms environment and ecology yet demanding highly efficient and durable materials for oil–water separations. In this work, ultra-light and highly flexible polyurethane (PU) sponges were engineered to 3D oil–water separators by coating the dysprosium metal organic framework (Dy-MOF) onto the surfaces of the PU frames. Through a facile impregnation, the Dy-MOF was attached to the full frames of the sponges. Consequently, liquid contact surfaces were extended from these on top layers to the whole rack. Superhydrophobicity with water contact angles up to 152.08° and lipophilicity enable continuous separations of dichloromethane from water through the resulted Dy-MOF@PU sponges in a continuous mode. The modified sponges own high gravimetric absorption capacities for oil and organic solvents, and high resistances to temperature variations, corrosive solutions, and mechanical abrasions, thanks to the well-connected and stable superhydrophobic/supportive interfaces. An efficient separation was successfully piloted for oily wastewater consisting of water-in-oil emulsions stabilized by surfactants, demonstrating the potential of practical water treatment of Dy-MOF@PU in complex environments. Mechanism leading to superior oil–water separation capability was studied and inferred as the combined effects of the physical and chemical properties arisen from the stable Dy-MOF and flexible but porous matrix.

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Series: Applied surface science
ISSN: 0169-4332
ISSN-E: 1873-5584
ISSN-L: 0169-4332
Volume: 614
Article number: 156183
DOI: 10.1016/j.apsusc.2022.156183
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This work was financially supported by Xiangtan University and China Scholarship Council. W. Cao acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programs (grant agreement No. 101002219).
EU Grant Number: (101002219) CATCH - Cross-dimensional Activation of Two-Dimensional Semiconductors for Photocatalytic Heterojunctions
Copyright information: © 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (