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| Effect of Ionic Liquid Pretreatment on the Lignin Removal and Enzymatic Hydrolysis of Miscanthus × giganteus |
| Received:January 09, 2020 |
| DOI：10.11980/j.issn.0254-508X.2020.06.007 |
| Key Words:ionic liquid pretreatment lignin Miscanthus×giganteus enzymatic hydrolysis |
| Fund Project:国家重点研发计划资助项目（2017YFB0307900）；国家自然科学基金资助项目（31670595，31770628）；泰山学者工程。 |
| Author Name | Affiliation | Postcode | | ZHOU Quanwei | State Key Lab of Bio-based Material and Green Papermaking/Key Lab of Pulp &
Paper Science and Technology of Education Ministry of China, Qilu University of Technology（Shandong Academy of Sciences）, Ji’nan, Shandong Province, 250353 | 250353 | | WANG Chao | State Key Lab of Bio-based Material and Green Papermaking/Key Lab of Pulp &
Paper Science and Technology of Education Ministry of China, Qilu University of Technology（Shandong Academy of Sciences）, Ji’nan, Shandong Province, 250353 | 250353 | | YANG Guihua | State Key Lab of Bio-based Material and Green Papermaking/Key Lab of Pulp &
Paper Science and Technology of Education Ministry of China, Qilu University of Technology（Shandong Academy of Sciences）, Ji’nan, Shandong Province, 250353 | 250353 | | XU Feng | State Key Lab of Bio-based Material and Green Papermaking/Key Lab of Pulp &
Paper Science and Technology of Education Ministry of China, Qilu University of Technology（Shandong Academy of Sciences）, Ji’nan, Shandong Province, 250353
Beijing Key Lab of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083)
(*E-mail:corresponding author:chaowang@qlu.edu.cn
chenjc@qlu.edu.cn | 100083 | | ZHANG Kai | State Key Lab of Bio-based Material and Green Papermaking/Key Lab of Pulp &
Paper Science and Technology of Education Ministry of China, Qilu University of Technology（Shandong Academy of Sciences）, Ji’nan, Shandong Province, 250353 | 250353 | | CHEN Jiachuan | State Key Lab of Bio-based Material and Green Papermaking/Key Lab of Pulp &
Paper Science and Technology of Education Ministry of China, Qilu University of Technology（Shandong Academy of Sciences）, Ji’nan, Shandong Province, 250353 | 250353 |
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| Abstract:In this study, Miscanthus × giganteus (M×g) was pretreated by alcoholamine-based ionic liquids under different conditions for delignification. The changes of functional groups, crystallinity and microstructure of M×g were analyzed by infrared spectrum, X-ray diffraction and scanning electron microscope. The results showed that ethanolamine acetate ([EOA][OAc]) among the five ionic liquids was the best for lignin removal of M×g. The [EOA][OAc] pretreatment result was better than imidazole-based ionic liquid pretreatment. The optimal conditions of [EOA][OAc] pretreatment were at 140℃ for 5 h with the solid-liquid ratio of 1∶10, in which the highest lignin removal of 76.67% was obtained. The yields of glucose and xylose of the pretreated M×g after using enzymatic hydrolysis mixed enzyme (20 FPU/g) in 50℃ for 72 h were 85.78% and 79.78%, respectively. The yields of glucose and xylose were 4.37 and 11.97 times of that of unpretreated M×g, respectively. Under the best conditions after the [EOA][OAc] pretreatment, the cellulose content of M×g increased from 37.99% to 52.49%, and the fiber structure was loose. The crystal structure of cellulose was unchanged, and the crystallinity decreased, as a result accessibility of cellulose was improved. When [EOA][OAc] was recycled and reused for the fifth time, the lignin removal rate was still (48.46±2.01)% indicating that [EOA][OAc] was suitable for recycling. |
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