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Preparation of Multiscale Lignocellulosic Nanofibrils by p-Toluenesulfonic Acid Hydrolysis and High-pressure Homogenization
Received:March 20, 2022  
DOI：10.11981/j.issn.1000-6842.2023.02.52
Key Words:p-toluenesulfonic acid;high-pressure homogenization;lignocellulosic nanofibril;residual lignin;poplar chemi-mechanical pulp
Fund Project:生物基材料与绿色造纸国家重点实验室开放基金（KF201917）；江苏省高等学校大学生创新创业训练计划项目（202110298051Z）。
Author NameAffiliationPostcode
DONG Maolin* College of Light Industry and Food Engineering， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 210037
SU Wenhao College of Light Industry and Food Engineering， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 210037
SHU Xuan College of Light Industry and Food Engineering， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 210037
JIANG Bo College of Light Industry and Food Engineering， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 210037
DAI Hongqi College of Light Industry and Food Engineering， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 210037
JI Xingxiang State Key Lab of Biobased Material and Green Papermaking， Qilu University of Technology （Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 250353
BIAN Huiyang College of Light Industry and Food Engineering， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037
State Key Lab of Biobased Material and Green Papermaking， Qilu University of Technology （Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 		250353
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Abstract:
      Lignocellulosic nanofibrils （LCNF） were prepared from poplar chemi-mechanical pulp by p-toluenesulfonic acid hydrolysis and high-pressure homogenization method. The law of lignin removal during p-toluenesulfonic acid hydrolysis and the effect of residual lignin on the microscopic morphology， size， crystal structure， and thermostability of LCNF were studied. The results showed that p-toluenesulfonic acid hydrolysis effectively removed lignin and weakened the binding force between fibers， which was beneficial for dissociating and dispersing microfibrils in the high-pressure homogenization process. Compared with the raw material， the amorphous region of LCNF was destroyed and the crystallinity increased from 43.9% to 66.0%. The residual lignin content could be regulated by acid hydrolysis， and the average width of LCNF after high-pressure homogenization could be further controlled， achieving preparation of multiscale LCNF. The lower the lignin content in LCNF， the better the dispersion performance of LCNF and the more uniform the size. When the residual lignin content was 4.89%， the average width of LCNF reached the minimum of 10.6 nm， and the maximum thermogravimetric degradation temperature （Tmax） was between 350~360 ℃.
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