Dissolution and Delignification of Bamboo Biomass Using Amino Acid-Based Ionic Liquid

Abstract

In the present work, the dissolution of bamboo biomass was tested using a number of ionic liquids synthesized in laboratory. It was observed that one of the synthesized amino acid-based ionic liquids, namely 1-ethyl-3-methylimidazolium glycinate, was capable of dissolving the biomass completely. The dissolved biomass was then regenerated using a reconstitute solvent (acetone/water) and was characterized using Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. The results were compared to preconditioned bamboo biomass. The regenerated biomass was found to have a more homogenous macrostructure, which indicates that the crystalline form and structure of its cellulose has changed from type Ι to type ΙΙ during the dissolution and regeneration process.

Comparative Study of the Preparation of Reducing Sugars Hydrolyzed from High-Lignin Lignocellulose Pretreated with Ionic Liquid, Alkaline Solution and Their Combination

“…After pretreatment with 1% NaOH and regeneration, the diffraction intensity of substrates was typical of cellulose I. Cellulose I properties are close to those of cellulose, with a high crystallinity and distinct peaks at the angles (16 o , 22 o and 35 o ) described above. These results were similar and comparable to previously published reports [19][20][21][22][23]. The increase in the crystalline index of substrate pretreated with NaOH was mainly caused by the liquefaction of the amorphous parts (lignin and hemicellulose).…”

“…These are the typical patterns for crystalline cellulose I, which have been studied by other authors [19,[21][22][23]. After pretreatment with 1% NaOH and regeneration, the diffraction intensity of substrates was typical of cellulose I. Cellulose I properties are close to those of cellulose, with a high crystallinity and distinct peaks at the angles (16 o , 22 o and 35 o ) described above.…”

Chemical Pretreatment Methods for the Production of Cellulosic Ethanol: Technologies and Innovations

“…ILs could be designed and developed to pretreat specific biomass under optimal conditions by combining cations and anions which can result in an estimated formulation of 10 9 ILs [169]. For example, the ILs 1-ethyl-3-methylimidazolium glycinate (Emim-Gly) and 1-allyl-3-methylimidazolium chloride (Amim-Cl) were synthesized from various compounds for the dissolution of bamboo [170] and wood [71], respectively. In addition, the properties of ILs could be altered by varying the length and branching of the alkyl groups that are integrated into the cation [171].…”

Pyrrolidinium Ionic Liquids as Effective Solvents for Lignin Extraction and Enzymatic Hydrolysis of Lignocelluloses

“…Generally, ILs with strong hydrogen bond basicity are effective in weakening the hydrogen-bonding network of the polymer chains (Abe et al 2010;Muhammad et al 2011). In this work, a higher yield of lignin was isolated by [Hmp]Cl.…”