Tolesa Leta Deressa, Gupta Bhupender S, Lee Ming-Jer
Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan.
ACS Omega. 2018 Sep 30;3(9):10866-10876. doi: 10.1021/acsomega.8b01447. Epub 2018 Sep 7.
Four ammonium-based ionic liquids were synthesized for the selective extraction and degradation of lignin from coffee husk. The extracted lignin samples were characterized by Fourier transform infrared, gel permeation chromatography, gas chromatography-mass spectrometry, UV-vis, H and C NMR, heteronuclear single-quantum coherence-NMR, thermogravimetric analysis, X-ray diffraction, and field emission scanning electron microscopy analyses. The analyzed results confirmed that these ionic liquids are able to effectively extract and decompose the lignin to smaller molecules from the biomass. Experimental results show that a significantly high yield, 71.2% of the original lignin, has been achieved. This processing method is an efficient, economical, and environmentally friendly green route for producing high-added-value lignin from wasted coffee husk.
合成了四种铵基离子液体，用于从咖啡壳中选择性提取和降解木质素。通过傅里叶变换红外光谱、凝胶渗透色谱、气相色谱-质谱联用、紫外可见光谱、氢核磁共振和碳核磁共振、异核单量子相干核磁共振、热重分析、X射线衍射以及场发射扫描电子显微镜分析对提取的木质素样品进行了表征。分析结果证实，这些离子液体能够有效地从生物质中提取木质素并将其分解为小分子。实验结果表明，已实现了高达71.2%的原始木质素的显著高产率。这种加工方法是一种从废弃咖啡壳中生产高附加值木质素的高效、经济且环保的绿色途径。
