Abstract
The effect of different treatments on the enzymatic hydrolysis of furfural residue (FR) was investigated in delignification and structural features. In this case, hot water, ethanol, sodium hydroxide, alkali ethanol, and alkaline hydrogen peroxide solution (AHP) were selected as the delignification solvents. The structure and morphology of the original and treated samples were comparatively studied by diffuse reflectance infrared Fourier transform spectrometry (DRIFT), XRD, SEM, and CP/MAS 13C NMR. After AHP treatment, the ratio of total lignin to cellulose content in FR and the absorbance ratio of lignin to cellulose (A 1508/A 1057) on the sample surface in the DRIFT spectra was reduced from 0.99 to 0.13 and from 0.40 to 0.04, respectively, which resulted in the highest conversion of cellulose to glucose (99.3 %). It was found that the crystallinity index of FR linearly increased with the decrease of total lignin to cellulose ratio. DRIFT analysis indicated that the high lignin content on the sample surface resulted in a low enzymatic hydrolysis efficiency.
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Acknowledgments
The authors are extremely grateful for the financial support from the Fundamental Research Funds for the Central Universities (BLYJ201315), National Natural Science Foundation of China (31110103902), Major State Basic Research Projects of China (973-2010CB732204, 2012CB215302), the Ministry of Science and Technology (2012 BAD32B06), and State Forestry Administration (201204803).
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Sun, SN., Cao, XF., Li, MF. et al. Treatment of Furfural Residue by Solvent Extraction for Enzymatic Hydrolysis: Effect of Delignification on the Structure and Digestibility. Bioenerg. Res. 6, 1022–1029 (2013). https://doi.org/10.1007/s12155-013-9329-0
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DOI: https://doi.org/10.1007/s12155-013-9329-0