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A Simple Approach to Prepare Carboxycellulose Nanofibers from Untreated Biomass

來(lái)源:美國(guó)布魯克海文儀器公司   2018年04月04日 10:05  
 作者 Priyanka R. Sharma, Ritika Joshi, Sunil K. Sharma, and Benjamin S. Hsiao*

Department of Chemistry, Stony Brook University, Stony Brook, New York11794-3400, United States

 

摘要:A simple approach was developed to prepare carboxycellulose nanofibers directly from untreated biomass using nitric acid or nitric acid-sodium nitrite mixtures. Experiments indicated that this approach greatly reduced the need for multichemicals, and offered significant benefits in lowering the consumption of water and electric energy, when compared with conventional multiple-step processes at bench scale (e.g., TEMPO oxidation). Additionally, the effluent produced by this approach could be efficaciously neutralized using base to produce nitrogen-rich salts as fertilizers. TEM measurements of resulting nanofibers from different biomasses, possessed dimensions in the range of 190–370 and 4–5 nm, having PDI = 0.29–0.38. These nanofibers exhibited lower crystallinity than untreated jute fibers as determined by TEM diffraction, WAXD and 13C CPMAS NMR (e.g., WAXD crystallinity index was 35% for nanofibers vs 62% for jute). Nanofibers with low crystallinity were found to be effective for removal of heavy metal ions for drinking water purification.

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