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Simultaneous extraction of carboxylated cellulose nanocrystals and nanofibrils via citric acid hydrolysis – a sustainable route.
Chao Liu, Haishun Du, Guang Yu, Yuedong Zhang, Qingshan Kong, Bin Li*, Xindong Mu.
2017-08-04
Source PublicationPaper and Biomaterials
Volume2Issue:4Pages:19-26
Other AbstractIn this study, cellulose nanocrystals (CNC) with surface carboxylic groups were prepared from bleached softwood pulp by hydrolysis with concentrated citric acid at concentrations of 60 wt%~80 wt%. The solid residues from acid hydrolysis were collected for producing cellulose nanofibrils (CNF) via post high-pressure homogenization. Citric acid could be easily recovered after hydrolysis reactions through crystallization due to its low water solubility or through precipitation as a calcium salt followed by acidification. Several important properties of CNC and CNF, such as dimension, crystallinity, surface chemistry, thermal stability, were evaluated. Results showed that the obtained CNC and CNF surfaces contained carboxylic acid groups that facilitated functionalization and dispersion in aqueous processing. The recyclability of citric acid and the carboxylated CNC/CNF give the renewable cellulose nanomaterial huge potential for a wide range of industrial applications. Furthermore, the resultant CNC and CNF were used as reinforcing agents to make sodium carboxymethyl cellulose (CMC) films. Both CNC and CNF showed reinforcing effects in CMC composite films. The tensile strength of CMC films increased by 54.3% and 85.7% with 10 wt% inclusion of CNC and CNF, respectively. This study provides detailed information on carboxylated nanocellulose prepared by critic acid hydrolysis; a sustainable approach for the preparation of CNC/CNF is of significant importance for their various uses.
SubtypeArticle
KeywordCellulose Nanocrystals Cellulose Nanofibrils Carboxylic Acid Cellulose Hydrolysis
Document Type期刊论文
Identifierhttp://ir.qibebt.ac.cn/handle/337004/9898
Collection材料生物技术研究中心
Affiliation中国科学院青岛生物能源与过程研究所
Recommended Citation
GB/T 7714
Chao Liu, Haishun Du, Guang Yu, Yuedong Zhang, Qingshan Kong, Bin Li*, Xindong Mu.. Simultaneous extraction of carboxylated cellulose nanocrystals and nanofibrils via citric acid hydrolysis – a sustainable route.[J]. Paper and Biomaterials,2017,2(4):19-26.
APA Chao Liu, Haishun Du, Guang Yu, Yuedong Zhang, Qingshan Kong, Bin Li*, Xindong Mu..(2017).Simultaneous extraction of carboxylated cellulose nanocrystals and nanofibrils via citric acid hydrolysis – a sustainable route..Paper and Biomaterials,2(4),19-26.
MLA Chao Liu, Haishun Du, Guang Yu, Yuedong Zhang, Qingshan Kong, Bin Li*, Xindong Mu.."Simultaneous extraction of carboxylated cellulose nanocrystals and nanofibrils via citric acid hydrolysis – a sustainable route.".Paper and Biomaterials 2.4(2017):19-26.
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