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| Study on Lignin Fractionation Efficiency of Moso Bamboo by Ternary Deep Eutectic Solvents Based on FeCl3 |
| Received:December 22, 2023 Revised:January 22, 2024 |
| DOI：10.11981/j.issn.1000-6842.2024.02.09 |
| Key Words:FeCl3;lignin fractionation;deep eutectic solvent;hydrogen bond;Raman spectroscopy |
| Fund Project:四川省自然科学基金面上项目（2023YFN0025）。 |
| Author Name | Affiliation | Postcode | | HE Jingpeng | School of Biological Engineering， Sichuan University of Science & Engineering， Yibin， Sichuan Province， 644002 | 644002 | | ZHAO Deqing* | School of Biological Engineering， Sichuan University of Science & Engineering， Yibin， Sichuan Province， 644002 | 644002 | | ZHAO Yaling | School of Biological Engineering， Sichuan University of Science & Engineering， Yibin， Sichuan Province， 644002 | 644002 | | ZHU Lei | School of Biological Engineering， Sichuan University of Science & Engineering， Yibin， Sichuan Province， 644002 | 644002 | | WANG Qinjing | School of Biological Engineering， Sichuan University of Science & Engineering， Yibin， Sichuan Province， 644002 | 644002 | | HE Yunjie | School of Biological Engineering， Sichuan University of Science & Engineering， Yibin， Sichuan Province， 644002 | 644002 | | XU Xiucheng | School of Biological Engineering， Sichuan University of Science & Engineering， Yibin， Sichuan Province， 644002 | 644002 |
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| Abstract: |
| Improving the efficiency of lignin fractionation by deep eutectic solvents （DES） is an important prerequisite for the valorization of lignocellulosic resource. The acidic， neutral and alkaline binary DES systems were used for the lignin fractionation from moso bamboo. On this basis， a ternary DES system was designed to facilitate the lignin isolation rate. The process optimization of lignin fractionation using the ternary DES system， the quantitative analysis of hydrogen bond property via Kamlet-Taft method and the structural characterization of moso bamboo lignin isolated by DES were investigated， respectively. The results showed that the lignin dissolution rate of binary DES was in the order of acidic DES>neutral DES>alkaline DES， and the ternary DES system composed of FeCl3-polyethylene glycol 400-choline chloride was more efficient in lignin dissolution with the optimum process conditions for the moso bamboo lignin fractionation with temperature at 130 ℃， time for 3 h， mass ratio of 1∶15 and water addition of 10% （proportion of polyethylene glycol 400）. The dissolution rate was 96.13% under the optimum process conditions. The hydrogen bonding alkalinity of DES was increased significantly by coordinating FeCl3 in binary DES system， leading to a high hydrogen bond-accepting capacity. Both Raman and FT-IR spectroscopy analysis indicated that the main lignin basis structural units in DES lignin were S-type and G-type. Moreover， the structural integrity of DES lignin was better than that of alkali lignin. The results can provide a reference for the efficient and clean fractionation of moso bamboo lignin by DES. |
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