期刊
INDUSTRIAL CROPS AND PRODUCTS
卷 113, 期 -, 页码 225-233出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2018.01.025
关键词
Lignocellulose biomass; Ionic liquid (IL); Co-solvent system; Dissolution; Ultra-porous aerogel
资金
- Science and Technology Agency of Jiangsu Province [XCL-063]
- Shanghai Municipal Education Commission [14ZZ071]
- Fundamental Research Funds for the Central Universities [16D310102]
- Natural Science Foundation of China [51303021]
Ionic liquid-based lignocellulose aerogel systems have attracted significant focus in advanced material research due to their intrinsic environment-friendly properties. Use of co-solvent is deemed useful in improving these systems efficiency without affecting reaction dynamics. Herein, a green synthesis strategy is reported to produce highly porous, physically cross-linked lignocellulose aerogel by dissolving lignocellulose biomass obtained from the cotton stalk in 1-allyl-3-methylimidazolium chloride/dimethyl sulfoxide (AmimCl/DMSO) co-solvent system. Samples with different concentrations were treated under both cyclic conventional freezing-thawing conditions (- 20 degrees C to 20 degrees C) and liquid nitrogen freezing-thawing conditions (-196 degrees C to 20 degrees C) followed by solvent exchange and freeze drying. Scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) analysis of these lignocellulose samples showed that conventional freezing-thawing treated samples exhibit hierarchical 3D open porous web-like structure with a low specific surface area and larger dominant pore diameter. On the other hand, use of liquid nitrogen freezing-thawing treatment resulted in the creation of film-like porous structure with a higher specific surface area and relatively smaller dominant pore diameter. Quantitative analysis through Fourier transform infrared spectroscopy (FT1R), X-ray diffraction (XRD), and thermo-gravimetric analysis (TGA) verified that cyclic freezing-thawing treatment has potential to fix all major components of lignocellulose in a matrix. The proposed strategy is not only environmentally benign but also the cost-effective making an ionic liquid-based system more commercially viable.
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