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    Robust superhydrophobic Ni-Co electrodeposited carbon felt for hot water repellency and controllable oil/water separation

    Year: 2023

    Journal: Journal of Environmental Chemical Engineering, Volume 11, 2023-02-01, page 109102

    Authors: Xuan, Junji; Xu, Likun; Xin, Yonglei; Xue, Lili; Li, Li

    Keywords: Superhydrophobicity; Electrodeposition; Carbon felt; Hot water; Nickel-cobalt alloy coating

    This study proposes a new recipe to manufacture robust superhydrophobic porous materials with magnetic properties that repel hot water. Through galvanostatic electrodeposition, the surface of carbon fibers in the carbon felt is entirely covered by the Ni-Co alloy coating with nano-protrusions and a thickness of about 2 µm. Under thermal annealing at 60 ℃, the resulting surface demonstrates diminishing wettability over time, and even superhydrophobicity after 12 h treatment. Meanwhile, when subjected to high compression force and cyclic abrasion, the as-prepared carbon felt displays robust superhydrophobicity. Due to the high porosity and fibrous structure, the Ni-Co coated carbon felt also exhibits high repellency to hot water as high as 90 ℃. In addition, the newly developed superhydrophobic carbon felt can be employed for oil/water separation in complex structures by controlling its movement through a magnet. The employed strategy can help reduce the potential pollution caused by environmentally hazardous low surface energy substances when using superhydrophobic materials and exhibit promising applications in oil/water separation fields for special scenes, e.g., hot liquids and intricate pipelines.
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