首页|Simultaneous Extraction of Carboxylated Cellulose Nanocrystals and Nanofibrils via Citric Acid Hydrolysis——A Sustainable Route

Simultaneous Extraction of Carboxylated Cellulose Nanocrystals and Nanofibrils via Citric Acid Hydrolysis——A Sustainable Route

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
In 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.

cellulose nanocrystalscellulose nanofibrilscarboxylic acidcellulose hydrolysis

Chao Liu、HaiShun Du、Guang Yu、YueDong Zhang、QingShan Kong、Bin Li、XinDong Mu

展开 >

CAS Key Laboratory of Bio-based Material, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong Province, 266101, China

financial support for this work is from the National Science & Technology Pillar Program during the Twelfth Five-year Plan PNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaPrimary Research and Development Plan of Shandong ProvincePrimary Research and Development Plan of Shandong Provincewell as the Young Taishan Scholars Program of Shandong Province

2015BAD14B063147060925106240214330012016GGX1040032016CYJS07A02tsqn20161052

2017

造纸与生物质材料(英文)
中国造纸学会　中国制浆造纸研究院

造纸与生物质材料(英文)

CHSSCD
影响因子：0.082
ISSN：2096-2355
年,卷(期)：2017.2(4)
  • 1
  • 29