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Download fileScalable Top-to-Bottom Design on Low Tortuosity of Anisotropic Carbon Aerogels for Fast and Reusable Passive Capillary Absorption and Separation of Organic Leakages
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posted on 2019-12-03, 20:46 authored by Caichao Wan, Yue Jiao, Song Wei, Xianjun Li, Wenyan Tian, Yiqiang Wu, Jian LiCreation of sustainable, cost-effective, and scalable
absorbents
with ideal absorption properties is a worldwide challenge because
many high-performance absorbents are still restricted in laboratory
scope due to several critical defects (like complex and eco-unfriendly
synthesis process, high cost, and difficulty in large-scale production).
Herein, a facile and scalable top-to-bottom design is proposed to
create a kind of novel anisotropic carbon aerogels with low tortuosity
of stacked laminated structure, derived from the hierarchical cellular
channels of balsa wood. By virtue of this unique structure and favorable
oleophilicity, fast passive capillary absorption with low flow resistance
is achieved (as demonstrated by the theoretical modeling). As a result,
the anisotropic carbon aerogels have quite sensitive selectivity to
separate organic pollutants from water, broad-spectrum and high absorption
capacity for different organic liquids (13 277–31 597
mg g–1), and superior recyclability (98.7% absorption
capacity retention after five cycles). Combining these outstanding
performances with a cheap preparation strategy as well as good environmental
friendliness, this work provides a kind of potential scalable materials
for efficient reusable absorption and separation of organic leakages.
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Anisotropic Carbon AerogelsLow Tortuositypreparation strategyscalable materialscapillary absorptionScalable Top-to-Bottom Designanisotropic carbon aerogelslaboratory scopebalsa woodOrganic Leakages CreationReusable Passive Capillary Absorptionscalable absorbentskindabsorption capacityflow resistanceeco-unfriendly synthesis processabsorption propertiesnovel anisotropic carbon aerogels