Abstract
Lignocellulosic biomass aerogels with relatively high Brunauer–Emmett–Teller (BET) surface area and pore volume were prepared directly from bagasse solutions in the present study. Bagasse was dissolved in DMSO/LiCl, treated with cyclic freezing-thawing processes, and regenerated with water. The resulted bagasse hydrogels were solvent-exchanged to t-butanol and subjected to freeze-drying to obtain the lignocellulosic aerogels. The structure of the aerogels was studied with FTIR, nitrogen absorption, SEM, and XRD. The results showed that the aerogels had sheet-like skeletons interconnected with one another to form three-dimensional networks. The highest BET surface area and total pore volume of the aerogels were 185 m2/g and 0.46 cm3/g, respectively. By adjusting the concentration of bagasse solution in DMSO/LiCl, the structure of the aerogels could be controlled to some extent.
Highlights
Aerogels are solid materials prepared by replacing the liquid solvent in a gel by gas without substantially collapsing the gel solid network (Tan et al 2001)
The dissolution of bagasse in DMSO/LiCl resulted in a low viscosity solution, and no gelation was observed as the concentration of bagasse in DMSO/ LiCl was lower than 7 %
The results showed that the bagasse aerogels had high specific surface area with a maximum of 185 m2/g, substantially higher than those of lignocellulosic aerogels (2–7.5 m2/g) prepared from wood solution in ionic liquid (IL) by cyclic freezing-thawing process
Summary
Aerogels are solid materials prepared by replacing the liquid solvent in a gel by gas without substantially collapsing the gel solid network (Tan et al 2001). Lignocellulosic biomass film was prepared directly from bagasse solution in our laboratory (Chen et al 2014). The preparation of lignocellulosic biomass aerogels were achieved from wood solutions in 1-allyl-3methylimidazolium chloride with cyclic freezingthawing process and supercritical CO2 drying (Li et al 2011; Lu et al 2012).
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