Trevorah Raymond M, Huynh Tien, Brkljača Robert, Othman Maazuza Z
School of Engineering, RMIT University, P.O. Box 2476, Melbourne 3001, Australia.
School of Science, RMIT University, P.O. Box 71, Bundoora 3083, Australia.
ACS Omega. 2021 Feb 3;6(6):4126-4136. doi: 10.1021/acsomega.0c03616. eCollection 2021 Feb 16.
Organic solvents offer promising methods for the fractionation of lignocellulosic biomass. This study investigated the impact of γ-valerolactone (GVL) fractionation on the morphology of cellulose and its internal structure using scanning electron microscopy (SEM), nuclear magnetic resonance (NMR) and Fourier-transform infrared (FT-IR) spectroscopy. The solubilized lignin precipitated on the macrofibril surface as lignin spheres. GVL fractionation significantly increased the crystallinity of the recovered pulps from 0.29 for the sawdust to an average of 0.53 and a maximum of 0.66. The main states of cellulose that were susceptible to hydrolysis during the fractionation were amorphous and surface cellulose, both of which were reduced significantly, while paracrystalline and pure crystalline fractions in the pulp increased. It was concluded that GVL fractionation can produce a crystalline cellulose pulp of high quality suitable for further processing.
有机溶剂为木质纤维素生物质的分级分离提供了有前景的方法。本研究使用扫描电子显微镜（SEM）、核磁共振（NMR）和傅里叶变换红外（FT-IR）光谱研究了γ-戊内酯（GVL）分级分离对纤维素形态及其内部结构的影响。溶解的木质素以木质素球的形式沉淀在微纤丝表面。GVL分级分离显著提高了回收纸浆的结晶度，从锯末的0.29提高到平均0.53，最高可达0.66。分级分离过程中易水解的纤维素主要状态是无定形纤维素和表面纤维素，二者均显著减少，而纸浆中的准晶和纯晶部分增加。得出的结论是，GVL分级分离可以生产出适合进一步加工的高质量结晶纤维素纸浆。
