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Integrated Preparation of Hemicellulose Macromolecular and Nanocellulose from Bagasse
Received:May 30, 2021  
DOI：10.11980/j.issn.0254-508X.2021.10.001
Key Words:hemicellulose  nanocellulose  alkaline extraction  TEMPO oxidation  crystalline allomorph
Fund Project:广东省科技创新战略专项资金（pdjh2020a0035）；制浆造纸工程国家重点实验室开放基金资助项目（202011）；制浆造纸科学与技术教育部重点实验室开放基金资助（KF201918）。
Author NameAffiliationPostcode
XIONG Haiping State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
LONG Yu State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
JIANG Shipeng State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
LI Kanghao State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
XIANG Zhouyang State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
SONG Tao* State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
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Abstract:Hemicellulose macromolecular with an average molecular mass of 40~60 kDa was obtained with a high yield of 33.5%~73.1% from the bagasse pretreated by 4%~20% NaOH solution. Subsequently， well-dispersed TEMPO oxidized cellulose nanocrystal （TOCN） with diameter less than 15 nm and length in the range of tens of nanometers to 2 μm was prepared by 2，2，6，6-tetramethylpiperidine-1-oxyl-mediated （TEMPO） oxidation without extra mechanical treatment. The results showed that the NaOH pretreatment not only effectively extracted hemicellulose from bagasse， but also enhanced the preparation efficiency of nanocellulose via TEMPO oxidation. Traditional TEMPO oxidized fiber raw materials with mechanical treatment could only produce CNF. TOCN with good size could be obtained through NaOH pretreatment and TEMPO oxidation without mechanical treatment in this study. In addition， the increase of the alkali concentration used in the pretreatment resulted in the change of the cellulose crystalline allomorph. With the pretreatment time increased， the alkali concentration was decreased during crystalline allomorph transformation.
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