期刊
MATERIALS HORIZONS
卷 9, 期 5, 页码 1536-1542出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2mh00046f
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资金
- Nation Key R&D Program of China [2018YFC1508704]
- Key Research & Development Plan of Jiangsu Province [BE2020024]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX21_0193]
Inspired by the structure of sandy soils, researchers developed a multifunctional high-permeability film (PBC/PPSM) with graded nanofluidic channels, demonstrating high structural stability and flexibility in complex water environments and exhibiting outstanding separation performance.
The development of multifunctional films with a high permeability has been of great concern for effective separation of complex aqueous contaminants, especially in the face of zero or near-zero release regulations. Inspired by the natural structure of sandy soils, polydopamine-wrapped/connected polypyrrole sub-micron spheres (PPSM) were closely packed onto a polypyrrole-coated bacterial cellulose (PBC) support, by which a new two-layered PBC/PPSM composite film formed with graded nanofluidic channels. Interestingly, after being soaked in complex water environments of ethanol, acids, bases, heat, cold and high salinity, or else bended/folded for more than 10 times, the structure and performance of this film still stayed the same, validating its high structural stability and flexibility. Even in a high salinity environment over seawater, this PBC/PPSM film exhibits a dye-separation capacity of almost 100% with a surprisingly superhigh water permeance over one thousand L h(-1) m(-2) bar(-1), one or two magnitudes higher than that of the related films reported in the literature. Meanwhile, the ability for effective oil-water-separation was also validated. Besides the superhydrophilicity and underwater superoleophobicity, the synapse-like-structure-induced graded nanofluidic channels are also proposed to play a key role for rendering such an outstandingly comprehensive performance of the film by greatly overcoming fluid resistance and reducing permeation viscosity.
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