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Facile fabrication of the durable micro/nano-superhydrophilic/superoleophobic surface through one-step spraying for efficient oil–water separation

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Abstract

At present, frequent oily wastewater pollution has become one of the most concerning environmental issues. Typically, such a global challenge calls for the development of efficient and durable separation materials for oil spill cleanups. Inspired by hydrogels, the physical crosslinking of PVP with chitosan was utilized in this work to enhance the surface properties; in addition, a facile approach was described to prepare the superhydrophilic/superoleophobic surface for oil–water separation on various substrates through one-step spraying. The surface morphology, elementary composition, and wettability were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (XEDS), and contact angle measurement, respectively. The results suggested that the coating exhibited both superhydrophilicity and superoleophobicity on the stainless steel mesh (SSM), glass, and copper mesh. Particularly, the contact angle (CA) of edible oil on SSM reached up to 156°. The as-prepared coating also possessed excellent mechanical and chemical durability. Furthermore, the separating efficiencies of three kinds of oil–water mixtures, including diesel oil, edible oil, and lubricating oil, were higher than 98%, 97%, and 94%, respectively, at various oil–water ratios. Of note, the separation efficiency remained 96% after 15 separation cycles, indicating that the surface might serve as a promising repeatable material for oily wastewater.

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Acknowledgments

This work was supported by the Science and Technology Department of Sichuan Province (2017JZ0021, 2017SZ0039) and the Education Department of Sichuan Province (17ZA0298).

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Authors and Affiliations

  1. College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, China

    Mengfan Luo, Yan Liu, Yanzong Zhang, Lilin Wang, Fei Shen, Gang Yang, Xiaohong Zhang, Ling Luo, Yan He & Shihuai Deng

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  1. Mengfan Luo
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  2. Yan Liu
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Luo, M., Liu, Y., Zhang, Y. et al. Facile fabrication of the durable micro/nano-superhydrophilic/superoleophobic surface through one-step spraying for efficient oil–water separation. J Coat Technol Res 17, 747–754 (2020). https://doi.org/10.1007/s11998-019-00299-y

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