Cunha-Pereira Fernanda DA, Matte Carla R, Costa Tania M H, Dupont Jairton, Ayub Marco AntÔnio Z
Universidade Federal do Rio Grande do Sul, Laboratório de Tecnologia de Bioprocessos/ BiotecLab, Av. Bento Gonçalves, 9500,Caixa Postal 15090, 91501-970 Porto Alegre, RS, Brazil.
Universidade Federal do Rio Grande do Sul,. Instituto de Química, Av. Bento Gonçalves, 9500, Caixa Postal 15090, 91501-970 Porto Alegre, RS, Brazil.
An Acad Bras Cienc. 2020 Nov 11;92(3):e20191258. doi: 10.1590/0001-3765202020191258. eCollection 2020.
We investigated the changes in the physical structure of cellulose recovered from soybean and rice hulls treated with the ionic liquids 1-butyl-3-methylimidazolium chloride ([bmim][Cl]) and 1-butyl-3-methylimidazolium acetate ([bmim][Ac]). The characterization was carried out by a combination of thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Regenerated cellulose from soybean hull showed loss of crystallinity and high structural disruption caused by both ionic liquid treatments as compared to the untreated material. In contrast, rice hull presented only a small structural disruption when treated with [bmim][Ac] and was practically unaffected by [bmim][Cl], showing that this biomass residue is recalcitrance towards physico-chemical treatments, possibly as a consequence of its high composition content in silica. These results suggest the use of soybean hull as a substrate to be treated with ionic liquids in the preparation of lignocellulosic hydrolysates to be used in second-generation ethanol production, whereas other methods should be considered to treat rice hull biomass.
我们研究了从经离子液体1-丁基-3-甲基咪唑氯盐（[bmim][Cl]）和1-丁基-3-甲基咪唑醋酸盐（[bmim][Ac]）处理的大豆壳和稻壳中回收的纤维素的物理结构变化。通过热重分析（TGA）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）相结合的方法进行表征。与未处理的材料相比，经两种离子液体处理后，从大豆壳中再生的纤维素显示出结晶度的损失和高度的结构破坏。相比之下，稻壳在用[bmim][Ac]处理时仅表现出较小的结构破坏，并且实际上未受[bmim][Cl]的影响，这表明这种生物质残渣对物理化学处理具有抗性，这可能是由于其二氧化硅含量高所致。这些结果表明，在制备用于第二代乙醇生产的木质纤维素水解产物时，可将大豆壳用作经离子液体处理的底物，而应考虑采用其他方法处理稻壳生物质。
