摘要
Lignin is a renewable bioresource that can be used for a variety of value-added applications.However,the effective separation of lignin from lignocellulosic biomass remains an ongoing challenge.In this study,lignin was extracted from waste palm fiber and successfully converted into a dehumidifying material.The following four process parameters of lignin extraction from palm fiber were optimized systematically and comprehensively using the response surface methodology:reaction time,extraction temperature,ethanol concentration and solid/liquid ratio.The results revealed that under the optimum processing conditions(111 min of extraction at 174℃ using 73%ethanol at 1/16 g/mL solid/liquid ratio),the extraction yield of lignin was 56.2%.The recovery of ethanol solvent was as high as 91.8%.Further,the lignin could be directly used without purification to produce lignin-based activated carbon fibers(LACFs)with specific surface area and total pore volume of 1375 m²/g and 0.881 cm³/g,respectively.Compared with the commercial pitch-based activated carbon fiber,the LACF has a higher specific area and superior pore structure parameters.This work provides a feasible route for extracting lignin from natural palm fiber and demonstrates its use in the preparation of activated carbon fiber with a remarkable performance as a solid dehumidification agent.
基金
supported by the National Natural Science Foundation of China(Grant number:21965040)
Science Research Foundation of Yunnan Education Bureau(Grant numbers:2020Y0098 and 2021Y492).
