Dissolution of lignin in green urea aqueous solution

被引：33
作者：
Wang, Jingyu [1 ]
Li, Ying [1 ]
Qiu, Xueqing [1 ,2 ]
Liu, Di [1 ]
Yang, Dongjie [1 ]
Liu, Weifeng [1 ]
Qian, Yong [1 ,2 ]
机构：
[1] South China Univ Technol, Sch Chem & Chem Engn, Guangzhou, Guangdong, Peoples R China
[2] South China Univ Technol, State Key Lab Pulp & Paper Engn, Guangzhou, Guangdong, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2017年 / 425卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Lignin; Dissolution; Urea; Hydrogen bond; pi-pi interation; ATOMIC-FORCE MICROSCOPY; KRAFT LIGNIN; IONIC LIQUID; EFFICIENT DISSOLUTION; SURFACE-PROPERTIES; MOLECULAR-WEIGHT; SOLVENT; CELLULOSE; FRACTIONATION; MIXTURES;
D O I：
10.1016/j.apsusc.2017.06.220
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The dissolution problem is the main obstacle for the value-added modification and depolymerization of industrial lignin. Here, a green urea aqueous solution for complete dissolution of various lignin is presented and the dissolution mechanism is analyzed by AFM, DLS and NMR. The results show that the molecular interaction of lignin decreases from 32.3 mN/m in pure water to 11.3 mN/m in urea aqueous solution. The immobility of H-1 NMR spectra and the shift of O-17 NMR spectra of urea in different lignin/ urea solutions indicate that the oxygen of carbonyl in urea and the hydrogen of hydroxyl in lignin form new hydrogen bonds and break the original hydrogen bonds among lignin molecules. The shift of H-1 NMR spectra of lignin and the decrease of interactions in model compound polystyrene indicate that urea also breaks the pi-pi interactions between aromatic rings of lignin. Lignin dissolved in urea aqueous has good antioxidant activity and it can scavenge at least 63% free radicals in 16 min. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：736 / 741
页数：6
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