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Bioinspired Dynamic Antifouling of Oil-Water Separation Membrane by Bubble-Mediated Shape Morphing

机译：Bioinspired Dynamic Antifouling of Oil-Water Separation Membrane by Bubble-Mediated Shape Morphing

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摘要

Oil–water separation membranes easily fail to oil foulants with low surfaceenergy and high viscosity, which severely limits these membranes’ applicationsin treating oily wastewater. Herein, an oil–water separation membrane bybioinspired bubble-mediated antifouling strategy is fabricated via growing hierarchicalcobalt phosphide arrays on stainless steel mesh. The as-prepared membraneis superhydrophilic/superaerophobic and electrocatalytic for hydrogenevolution under water, which helps to rapidly generate and release abundantmicrobubbles surrounding the oil-fouled region on the membrane. Thesemicrobubbles can spontaneously coalesce with the oil foulants to increasetheir buoyancy and warp their interface tension by morphing the oil shape. Andthis spontaneous coalescence also increases the kinetic energy of oil foulantsresulting from the decreased bubbles’ interface energy and potential energy. Thesynergy of the warped interface tension, increased buoyancy, and kinetic energydrives the efficiently dynamic antifouling of this membrane. This dynamicantifouling even can remove some solid sediment such as oily sand particlesthat causes more serious fouling of the membrane. Thus, this membrane maintainshigh flux (>11920 L m~(?2) h~(?1) bar~(?1)) in the long-term separation of oil–waterand oil–sand–water emulsions by dynamically recovering the decayed flux ondemand, which exhibits great potential in treating industrial oily wastewater.

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