Journal
GREEN CHEMISTRY
Volume 21, Issue 6, Pages 1292-1304Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8gc02854k
Keywords
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Funding
- National Natural Science Foundation of China [51676193, 51506207, 51561145015]
- Youth Innovation Promotion Association, CAS [2017401]
- Municipal Science and Technology Program of Guangzhou [201804010187]
- Guangdong Key Laboratory of New and Renewable Energy Research and Development [Y709ji1001]
- Netherlands Organisation for Scientific Research [040.21.006]
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An effective method for corncob saccharification was investigated over a magnetic carbon-based solid acid (MMCSA) catalyst in the aqueous phase. MMCSA was synthesized through a simple and inexpensive impregnation-carbonization-sulfonation process. Under the optimal reaction conditions (150 degrees C, 2 h, 0.5 g corncob, 0.5 g catalyst and 50 ml deionized water), 74.9% of xylose yield was directly obtained from corncob, with 91.7% cellulose retention in the residue. After the reaction, the MMCSA was easily separated from the residue using an external magnet and reused 4 times, showing its high stability and catalytic activity. The enzymatic digestibility of the pretreated residue reached 95.2%, with a total sugar yield of 90.4%. The morphological and structural properties of the natural and treated corncobs were analyzed primarily through 3D X-ray microscopy to characterize the cell wall thickness, porosity, and pore surface area distribution. The increase of macropores (pore surface areas >200 m(2)) was beneficial for the accessibility of cellulose to cellulosic enzymes, so the enzymatic digestibility was enhanced immediately. Compared with other traditional hydrolysis methods, this two-step hydrolysis approach represents an environmentally friendly and sustainable saccharification of lignocellulose to produce xylose and glucose while achieving the same level of reaction efficiency.
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