Biodegradable, biomimetic, and nanonet-engineered membranes enable high-flux and highly-efficient oil/water separation

Porous membranes with fascinating super-wettable surface and tunable porous architecture for oil-water separation have been developed rapidly, however, the serious secondary marine pollution caused by the non-degradable defectiveness of membranes themselves is still a thorny problem. Herein, we crea...

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Veröffentlicht in:Journal of hazardous materials 2022-07, Vol.434, p.128858-128858, Article 128858
Hauptverfasser: Zhou, Jing, Li, Xianglong, Hou, Teng, Zhang, Xianggui, Yang, Bin
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Sprache:eng
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Zusammenfassung:Porous membranes with fascinating super-wettable surface and tunable porous architecture for oil-water separation have been developed rapidly, however, the serious secondary marine pollution caused by the non-degradable defectiveness of membranes themselves is still a thorny problem. Herein, we create an eco-friendly membrane with biomimetic cobweb-like nanostructure via assembling two-dimensional bacterial cellulose nanonets on the starch nanofibrous membrane on a large scale. The obtained novel composite membranes exhibit integrated properties of sub-micron pore size, ultrahigh porosity, superhydrophilicity, and underwater superoleophobicity, stemming from the synergistic effect of the hydrated nanonet-skin-layer and porous starch matrix. By virtue of the narrow-distributed sub-micron pores, ultrahigh porosity, and ultrathin thickness, the resulting membrane shows outstanding performance of excellent separation efficiency (up to 99.996%), high percolation flux (maximum of 15968 L m−2 h−1), well surpassing the conventional microfiltration membranes. More significantly, with the advantage of biodegradability and anti-oil-fouling property, the membrane could serve as the robust platform for long-term wastewater remediation. [Display omitted] •2D spider-web like nanonet skin layer was constructed via in-situ assembly strategy.•Superhydrophilic and underwater superoleophobic with near zero oil adhesion force.•Ultrahigh flux of up to 15968 L m-2 h-1 and impressive efficiency (up to 99.996%).
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2022.128858