期刊
CHEMICAL ENGINEERING JOURNAL
卷 450, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138315
关键词
Deep eutectic solvent; Lignin nanoparticles; Structural characterization; Antioxidant properties; Cellulose saccharification
资金
- National Key Research and Develop- ment Program of China [2019YFB1503801]
- National Natural Science Foundation of China [31872698, 32071854]
- Beijing Forestry University Outstanding Young Talent Cultivation Project [2019JQ03006]
In this study, a tailored one-pot lignocellulose fractionation method was developed using ultrafast and recyclable microwave-assisted ternary deep eutectic solvent (DES) pretreatment. This method significantly reduced the recalcitrance of natural biomass, promoted the enzymatic saccharification of cellulose, and produced lignin nanoparticles. The delignification process during DES pretreatment was visually monitored. The glucose yield of the pretreated poplar reached 95.4%, which was 5.8 times higher than the control. The regenerated DES lignin exhibited nanosized lignin with controllable size and excellent antioxidant activity.
To achieve the global bio-based recycling economy with lignocellulosic biomass as feedstock, the additional value must be gained from both carbohydrates and lignin. In this study, a tailored one-pot lignocellulose fractionation, which was driven by ultrafast and recyclable microwave-assisted ternary deep eutectic solvent (DES, choline chloride: ethylene glycol: AlCl3) pretreatment, was developed to significantly reduce the natural biomass recalcitrance, promoting the production of lignin nanoparticles and facilitating enzymatic saccharification of cellulose. Confocal Raman microscopy (CRM) was applied to visually monitor the delignification in different cell walls during the DES pretreatments. Under the optimal condition (110 degrees C, 10 min), the glucose yield of the pretreated poplar via enzymatic saccharification reached 95.4 %, which was 5.8 times higher than that of the control. Advanced NMR characterizations of the DES lignin and control lignin fractions demonstrated that lignin polymers in the poplar wood had undergone the following structural changes, such as dehydration, depolymerization, condensation, and modification. Results showed that the regenerated DES lignin were nanosized lignin, exhibiting the low molecular weights, narrow distribution (1.28<1.38) with controllable size (<100 nm), and excellent antioxidant activity. In short, the tailored one-pot DES fractionation will improve the enzymatic digestibility and facilitate the lignin valorization, which will further promote the economic and overall benefits of biorefinery.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据