화학공학소재연구정보센터
Chemical Engineering Journal, Vol.322, 157-166, 2017
Facile preparation of superhydrophobic metal foam for durable and high efficient continuous oil-water separation
Foam-based material with unique wettability is one of the promising materials for developing oil-spill cleanup, benefiting from its intrinsic interconnected three-dimensional skeleton, oil permeation and water repellency. However, obtaining a foam-based material capable of in situ separating oil spills, especially with superhydrophobic durability and simple recycling mode, remains challenging. Herein, we reported a one-step spraying approach to fabricate fluorinated ethylene propylene (FEP)/polyvinylidene fluoride (PVDF)/ultrafine polyurethane (UPU)/hydrophobic nanosilica (HSiO2)-decorated nickel foam coating with a static water contact angle (WCA) of 157 +/- 1.5 degrees and a static oil contact angle (OCA) of 0 degrees. Owing to the foldability of the coated nickel foam, we established a continuous in-situ collection apparatus by external pumping on 3D nickel foam box. UPU addition endowed the resultant 3D nickel foam with excellent interfacial adhesion. After 7 days of continuous oil-water experiment that simulated cleanup oil-spill, the static WCA of the 3D nickel foam with 10 wt% UPU was still above 130 degrees. Notablely, after heat treatment at 240 degrees C, the fabricated 3D nickel foam coating could be refreshed from the damaged surface to superhydrophobic. (C) 2017 Elsevier B.V. All rights reserved.