In Situ Wood Delignification toward Sustainable Applications  

作　　者：Jianguo Li Chaoji Chen J.Y.Zhu Arthur J.Ragauskas Liangbing Hu 

机构地区：[1]Department of Materials Science and Engineering,University of Maryland,College Park,Maryland 20742,United States [2]Forest Products Laboratory,USDA Forest Service,Madison,Wisconsin 53726,United States [3]Department of Chemical and Biomolecular Engineering and Department of Chemical and Biomolecular Engineering and Center for Renewable Carbon,Department of Forestry,Wildlife,and Fisheries,University of Tennessee Institute of Agriculture,University of Tennessee,Knoxville,Tennessee 37996,United States [4]BioEnergy Science Center&Center for Bioenergy Innovation,Biosciences Division,University of Tennessee-Oak Ridge National Laboratory Joint Institute for Biological Science,Oak Ridge National Laboratory,Oak Ridge,Tennessee 37831,United States [5]Center for Materials Innovation,University of Maryland,College Park,Maryland 20742,United States

出　　处：《Accounts of Materials Research》2021年第8期606-620,共15页材料研究述评（英文）

摘　　要：CONSPECTUS:As one of the most abundant and versatile natural materials on Earth,recently wood has attracted tremendous attention from scientists and engineers due to its outstanding advantages,including hierarchically porous microstructure,high mechanical strength,environmental friendliness,renewability,and biodegradability.Wood’s hierarchically porous structure and chemical components(e.g.,cellulose,hemicelluloses,and lignin)enable its mechanical,ionic,optical,and thermal properties to be tuned via physical,chemical,and/or thermal modifications.Among these various approaches,the chemical delignification of bulk wood is the most fascinating,in which the majority of lignin and hemicelluloses is removed while leaving the cellulose intact,maintaining wood’s physical integrity and hierarchical structure.This delignified structure is unique,composed of hollow,aligned channels made up of cellulose microfibrils,and particularly attractive given its origin from a sustainable and renewable resource.As a result,delignified wood has attracted increasing attention for applications that go far beyond traditional wood utilization,such as lightweight yet strong structural materials,energy storage and conversion,environmental remediation,flexible electronics,and bioengineering.This Account reviews recent developments in bulk wood delignification strategies toward the achievement of such advanced wood technologies for sustainable applications,with a focus on the research in our group.Similar to chemical pulping and bleaching,wood delignification involves a series of nucleophilic reactions based on alkaline Na2SO3 or Na2S systems(i.e.,chemical pulping)or electrophilic,radical,and oxidation reactions based on H2O2,ClO2,or NaClO systems(i.e.,chemical bleaching)to deconstruct,fragment,and promote the hydrophilicity of lignin macromolecules,which finally make lignin easier to be removed.We discuss the structure and properties of partially and near-completely delignified wood,with a focus on process-structure−property relationshi

关 键 词：removed ATTRACTIVE VERSATILE 

分 类 号：TS7[轻工技术与工程—制浆造纸工程]