Pretreatment of Wheat Straw Lignocelluloses by Deep Eutectic Solvent for Lignin Extraction
Hongzhi Ma,
Penglu Fu,
Jihua Zhao,
Xingxing Lin,
Wenyu Wu,
Ziqiang Yu,
Changlei Xia,
Qunhui Wang,
Ming Gao,
Jun Zhou
Affiliations
Hongzhi Ma
Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Penglu Fu
Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jihua Zhao
Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Xingxing Lin
Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Wenyu Wu
Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Ziqiang Yu
Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Changlei Xia
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
Qunhui Wang
Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Ming Gao
Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jun Zhou
College of Management Academician Workstation, Changsha Medical University, Changsha 410219, China
In order to increase the fractionation efficiency of the wheat straw, a deep eutectic solvent (DES) system consisting of chlorine/lactic acid was used in this study for wheat straw pretreatment. The outcomes exhibited that DES pretreatment significantly enhanced the capability to extract lignin, retain cellulose, and remove hemicellulose. The best condition for the pretreatment of wheat straw was 150 °C for 6 h. The process retained most cellulose in the pretreated biomass (49.94–73.60%), and the enzymatic digestibility of the pretreatment residue reached 89.98%. Further characterization of lignin showed that the high yield (81.54%) and the high purity (91.33%) resulted from the ether bond cleavage in lignin and the connection between hemicellulose and lignin. As for application, the enzymatic hydrolysis of the best condition reached 89.98%, and the lignin also had suitable stability. The investigation exhibited that DES pretreatment has the potential to realize an efficient fractionation of lignocellulosic biomass into high-applicability cellulose and lignin of high-quality.
