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Capturing CO2 to reversible ionic liquids for dissolution pretreatment of cellulose towards enhanced enzymatic hydrolysis
- Li, Xiang, Xu, Qinqin, Shen, Hongwei, Guo, Yuanlong, Wu, Mouyi, Peng, Ya, Zhang, Lihua, Zhao, Zongbao Kent, Liu, Yu, Xie, Haibo
- Carbohydrate polymers 2019 v.204 pp. 50-58
- Fourier transform infrared spectroscopy, X-ray diffraction, atomic force microscopy, carbon dioxide, cellulose, electrolytes, enzymatic hydrolysis, glucose, guanidines, ionic liquids, saccharification, scanning electron microscopy
- To overcome the natural recalcitrance of cellulose for glucose production in aqueous media catalyzed by enzyme, in this study, a dissolution pretreatment strategy was developed by using in situ formed CO2-based reversible ionic compounds (RICs)/DMSO mixed organic electrolytes under mild conditions. The influences of the constitution of RICs, CO2 pressure, dissolution pretreatment time on the physic-chemical structure of cellulose were investigated systematically by FTIR, XRD, SEM, AFM towards in-depth understanding of the correlations between the pretreatment conditions, micro-scale structure and enzymatic saccharification of cellulose. The results showed that the tetramethyl guanidine (TMG) based RICs solvent system [TMGH]2+[O2COCH2CH2OCO2]2−/DMSO (XRICs = 0.1, XRICs: the mole fraction of the formed RICs in the mixture) presented the best performance, which was evidenced by 100% glucose yield after the dissolution-regeneration pretreatment strategy under mild conditions (T = 60 °C, Pco2 = 2.0 MPa, t = 2 h). Furthermore, the solvent system have good recyclability and usability.