欢迎访问《生物质化学工程》,

生物质化学工程 ›› 2017, Vol. 51 ›› Issue (4): 33-38.doi: 10.3969/j.issn.1673-5854.2017.04.005

• 研究报告 • 上一篇    下一篇

过硫酸铵氧化速生杨木残渣制备纤维素纳米晶体及其表征

韩彬彬1, 韩元帅1, 吴煜1, 江华1, 张洋2   

  1. 1. 南京林业大学 化学工程学院, 江苏 南京 210037;
    2. 南京林业大学 材料科学与工程学院, 江苏 南京 210037
  • 收稿日期:2016-05-19 出版日期:2017-07-30 发布日期:2017-08-03
  • 通讯作者: 江华,男,教授,硕士生导师,主要从事化工及反应方面的研究,E-mail:jianghua@njfu.com.cn E-mail:jianghua@njfu.com.cn
  • 作者简介:韩彬彬(1990-),男,安徽宿州人,硕士生,主要从事化工分离及反应研究
  • 基金资助:
    国家林业公益性行业科研专项重大项目(201504603);南京林业大学大学生创新基金(2015sjcx036)

Preparation and Characterizations of Cellulose Nanocrystals from Hybrid Poplar Residue by Ammonium Persulfate Oxidation

HAN Binbin1, HAN Yuanshuai1, WU Yu1, JIANG Hua1, ZHANG Yang2   

  1. 1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China;
    2. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Received:2016-05-19 Online:2017-07-30 Published:2017-08-03

摘要: 以去除半纤维素的速生杨木残渣为原料,在70℃下按固液比1:100(g:mL)加入1.5 mol/L过硫酸铵溶液,处理16 h制备纤维素纳米晶体。所得样品为白色粉末状固体,得率(以原料中纤维素质量计)为57%,氧化度为0.156,表面电荷为-42.15 mV。采用透射电子显微镜、傅里叶变换红外光谱、X射线衍射、核磁共振等技术对得到的纳米纤维素进行表征。结果表明:过硫酸铵去除了原料中的木质素和残余的少量半纤维素,并有选择地将纤维素C6位置上的伯醇羟基氧化成羧基,纤维素纳米晶体保留了原纤维素的结构特征,结晶度为77%,晶体结构以Iβ晶型为主,88.4%的纤维素纳米晶体宽度在10~24 nm之间。

关键词: 过硫酸铵, 杨木残渣, 纤维素纳米晶体, 表征

Abstract: The cellulose nanocrystals (CNCs) were prepared by ammonium persulfate oxidation of hybrid poplar residue obtained after the extraction of hemicellulose. The starting material was treated by 1.5 mol/L ammonium persulfate solution at 70℃ for 16 h, and the ratio of the solid to the liquid was 1:100(g:mL). The resulting CNCs were white powder and the yield(calculated by the mass of cellulose in the starting material) was 57%, the oxidation degree of CNCs was 0.156 and the surface charge was -42.15 mV. The CNCs were mainly characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction and nuclear magnetic resonance. The results showed that ammonium persulfate could remove the lignin and residual hemicellulose in the starting material and selectively oxidize the hydroxyl groups at the position of cellulose C6 to carboxyl groups. The cellulose nanocrystals kept the structural characteristics of the raw cellulose. The crystal structure of the CNCs, which had a crystallinity index of 77%, was dominated by Iβ, and 88.4% of them had a width of 10-24 nm.

Key words: ammonium persulfate, hybrid poplar residues, cellulose nanocrystals, characterizations

中图分类号: