微波辅助氢氧化钠处理玉米芯纤维素纤维可及性的研究

Muhammad Hanif, Aknasasia Virginia Krisanti, Selvy Salfitri, Y. Darni, H. Utami, Edwin Azwar, Poernomo Gunawan
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引用次数: 1

摘要

玉米芯是从作物收获中获得的丰富的木质纤维素生物质资源,在田间被发现是固体废物积累。用作烹饪固体燃料的玉米芯减少了,更多的玉米芯通过燃烧在田间消失了。有希望的是,玉米芯含有大量的纤维素,作为一种增值成分,有可能被用作生物材料或生物燃料原料。然而,天然木质纤维素生物质中木质素的存在导致顽固的结构,阻碍了纤维素的可及性。本研究旨在探讨微波辅助碱性处理在保留固体产物纤维素的同时去除玉米芯中的其他杂质,特别是半纤维素和木质素。氢氧化钠被选为一种浓度有变化的化学物质。在400 W微波功率、不同停留时间和1:10料液比下进行化学处理。经8%氢氧化钠浓度的化学处理,停留时间为20 min,纤维素含量由26.97%提高到71.26%,半纤维素和木质素分别由38.49%降低到18.15%和19.28%降低到6.4%。扫描电镜(SEM)和傅里叶变换红外(FTIR)分析也证实了这一结果。处理后的玉米芯结晶度由30.11%提高到52.91%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sodium Hydroxide Treatment for Cellulose Fiber Accessibility from Corncobs under Microwave Assistive
Corncob is abundantly available lignocellulosic biomass resources obtained from crops harvesting and found to be solid waste accumulation on a field. Less corncob is used as a solid fuel for cooking, and a more significant portion is vanished on the field by burning. Promisingly, corncob contains considerable cellulose as one value-added component potentially utilized as biomaterial or biofuel feedstock. However, the presence of lignin in natural lignocellulosic biomass results in recalcitrant structure and hinders cellulose accessibility. This study aimed to investigate microwave-assisted alkaline treatment to retain cellulose in the solid product while removing other impurities in corncob, especially hemicellulose and lignin. Sodium hydroxide was selected as a chemical with some variations in concentration. The chemical treatment was carried out under 400 W microwave power with various residence times and a 1:10 solid to liquor ratio. The cellulose content upgraded from 26.97% to 71.26% while reducing hemicellulose and lignin from 38.49% to 18.15% and 19.28% to 6.4%, respectively, on chemical treatment using 8% sodium hydroxide concentration for 20 minutes residence time. Scanning electron microscope (SEM) and Fourier transform infrared (FTIR) analysis also confirmed the results. The treated corncob also increased its crystallinity from 30.11% to 52.91%.
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