Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 251, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2021.114956
Keywords
Combined pretreatment; Carbocation scavenger; Lignin inhibition; Surface lignin barrier; Sugars production; Softwood biomass
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Funding
- National Key Research and Develop-ment Program of China [2019YFE0114600]
- National Natural Sci-ence Foundation of China [21776114, 52106245]
- Jiangsu Provincial Natural Science Foundation of China [BK20181347]
- Jiangsu Province Six Talent Peak [XNY-010]
- 111 Project [111-2-06]
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This study evaluated the effects of three additives on enhancing the effectiveness of combined pretreatment of pine-wood biomass, showing that additives could alter the physicochemical structure of lignin, alleviate the inhibitory effect of lignin repolymerization, and notably increase sugar yield. The findings suggest that additives play a crucial role in reducing lignin repolymerization and improving cellulose accessibility for high production of fermentable sugars and bioethanol in softwood biomass.
Pretreatment is the key factor for producing fermentable sugars and biofuels from lignocellulosic biomass. However, during pretreatment lignin repolymerization occurs which reduces the efficiency of carbohydrates hydrolysis. In the present study, three additives (2-naphthol-7-sulfonate, 2-naphthol, and mannitol) were evaluated for boosting the effectiveness of combined pretreatment (liquid hot water + green liquor) of pine-wood biomass. The results revealed that supplied additives into combined pretreatment changed the physicochemical structure of lignin, therefore, alleviating the inhibitory effect of lignin repolymerization and notably raised sugars yield (glucose, xylose) ranging from 85% to 93%. oS and FTIR analyses confirmed that -OH groups of additives led to lower formation of phenolic hydroxyl (PhOH) and higher hydrophilic groups of lignin, accounting for reduced non-specific binding of lignin into cellulase enzymes. Furthermore, additives increased surface lignin coverage, biomass porosity, and fiber swelling by 1.96-2.59, 1.66-1.86, and 1.13-1.29 folds respectively, comparing to corresponding sample without additives caused more liquified and extractable lignin, which notably reduced the surface lignin barrier. Hence, both factors including non-specific binding effect and surface lignin barrier, contributed to reducing lignin repolymerization, thereby increased cellulose accessibility for high production of fermentable sugars and bioethanol in softwood biomass.
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