一步法从六种未经预处理的生物质木质纤维素中制备含木质素的纳米纤维素

Lignin-containing nanocellulose(LCN)shows great potential in the fabrication of high performance bio-based materials,and suitable raw materials may achieve the production of LCN in a more economical approach.Therefore,in this study,the morphology,chemical and supramolecular structure of six types of lignocellulosic biomass(Broussonetia papyrifera bark,moso bamboo,rattan,balsa wood,poplar wood and fir wood)were analyzed for the production of LCN by using pure oxalic acid dihydrate(OAD).The results revealed that BPBs is a natural available cellulose-rich materials with extremely high cellulose content,low lignin content,and loosely connected cellulose chains.Compared with the other five types of lignocellulosic biomass materials,the hydrolysis of BPBs without any pretreatments by using OAD produced higher yield of LCN with much more uniform size distribution and smaller size;LCN from BPBs had higher crystallinity and thermal stability than that from the other five lignocellulosic biomass.The higher yield of LCN depended largely on the higher cellulose content of raw materials.When the cellulose content is 75.9%,the LCN yield can be more than 50%.The LCN prepared from slender and soft wood raw material exhibited smaller particle sizes with uniform distribution.The finding in this study indicated that Broussonetia papyrifera bark without any pretreatment was a favored material for high yield production of LCN compared with the other woody materials,which provided a economically realizable method on the efficient and high yield production of LCN from unpretreated BPBs by using OAD hydrolysis.