Isolation of High-Purity Cellulose Nanofibers from Wheat Straw through the Combined Environmentally Friendly Methods of Steam Explosion, Microwave-Assisted Hydrolysis, and Microfluidization

文献类型： 外文期刊

第一作者： Liu, Qi

作者： Liu, Qi;He, Wenqing;Yan, Changrong;Bai, Wenbo;Guo, Rui;Song, Jiqing;Liu, Qi;He, Wenqing;Yan, Changrong;Bai, Wenbo;Guo, Rui;Song, Jiqing;Liu, Qi;Goffin, Dorothee;Liu, Qi;Goffin, Dorothee;Liu, Qi;Aguedo, Mario;Jacquet, Nicolas;Goffin, Dorothee;Richel, Aurore;Lu, Yun;Ouyang, Canbin;Ouyang, Canbin

作者机构：

关键词： Wheat straw;Cellulose nanofibers;High purity;Steam explosion;Microwave-assisted hydrolysis;Microfluidization

期刊名称：ACS SUSTAINABLE CHEMISTRY & ENGINEERING （ 影响因子：8.198； 五年影响因子：8.471 ）

ISSN： 2168-0485

年卷期： 2017 年 5 卷 7 期

页码：

收录情况： SCI

摘要： High-purity cellulose nanofibers were isolated from wheat straw through an environmentally friendly, multistep treatment process that combined steam explosion, microwave-assisted hydrolysis, and micro fluidization. The cellulose content of the processed nanofibers increased from 44.81% to 94.23%, whereas the hemicellulose and lignin contents significantly decreased. Scanning electron microscopy revealed the effects of the isolation treatments on fiber morphology and width. Atomic force microscopy was used to observe the changes in the components, surface roughness, and crystallinity of the fibers. Transmission electron microscopy showed long, loose nanofiber bundles that were 10-40 nm wide with an average individual diameter of 5.42 nm. Fourier transform infrared spectroscopy showed that noncellulosic components were effectively removed. X-ray diffraction analysis revealed the improved crystallinity of the processed fibers, as well as the partial crystalline transformation of cellulose I to cellulose II. Thermogravimetric analysis and derivative thermogravimetric results showed the enhanced thermal properties of the nanofibers. The removal of hemicellulose and lignin increased the crystallinity of the fibers, thus enhancing the thermal properties of the processed fibers. Results indicated that the efficient, environmentally friendly, multistep treatment process yields nanofibers with potential advanced applications.

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