华南理工大学学报(自然科学版) ›› 2013, Vol. 41 ›› Issue (1): 95-99.doi: 10.3969/j.issn.1000-565X.2013.01.015

• 化学化工 • 上一篇    下一篇

尿素对碱木质素溶液行为和吸附特征的影响

邓永红 肖亮 冯鑫佳 杨东杰 邱学青   

  1. 华南理工大学 化学与化工学院, 广东 广州 510640
  • 收稿日期:2012-07-05 修回日期:2012-08-19 出版日期:2013-01-25 发布日期:2012-12-03
  • 通信作者: 邱学青(1965-),男,教授,博士生导师,主要从事木质素资源化高效利用研究. E-mail:cexqqiu@scut.edu.cn
  • 作者简介:邓永红(1969-),女,博士,副教授,主要从事天然高分子溶液行为及自组装研究.E-mail:yhdeng@scut.edu.cn
  • 基金资助:

    国家杰出青年科学基金资助项目(20925622);国家"973"计划项目(2012CB215302);国家自然科学基金资助项目(20976064)

Effect of Urea on Solution Behaviors and Adsorption Characteristics ofAlkali Lignin

Deng Yong-hong Xiao Liang Feng Xin-jia Yang Dong-jie Qiu Xue-qing   

  1. School of Chemistry and Chemical Engineering, South China University of Technology,Guangzhou 510640, Guangdong, China
  • Received:2012-07-05 Revised:2012-08-19 Online:2013-01-25 Published:2012-12-03
  • Contact: 邱学青(1965-),男,教授,博士生导师,主要从事木质素资源化高效利用研究. E-mail:cexqqiu@scut.edu.cn
  • About author:邓永红(1969-),女,博士,副教授,主要从事天然高分子溶液行为及自组装研究.E-mail:yhdeng@scut.edu.cn
  • Supported by:

    国家杰出青年科学基金资助项目(20925622);国家"973"计划项目(2012CB215302);国家自然科学基金资助项目(20976064)

摘要: 为了探究木质素氢键的作用力,以尿素为氢键破坏剂研究了氢键对碱木质素溶液行为和吸附特征的影响. 结果发现:随着尿素的不断加入,碱木质素的氢键破坏程度增大,羟基的红外吸收光谱往高波数方向移动;当在碱木质素中添加少量尿素时,尿素主要破坏碱木质素-水分子之间的氢键,导致碱木质素溶液粒径减小,比浓黏度降低,吸附量增大且吸附膜粗糙度增大;当添加尿素较多时,尿素以破坏碱木质素分子内部的氢键为主,导致溶液粒径增大,比浓黏度增大,吸附量减小且吸附膜粗糙度变小.

关键词: 碱木质素, 尿素, 氢键, 吸附, 溶液行为

Abstract:

In order to investigate the acting force of hydrogen bonds of lignin, the effects of hydrogen bond on thesolution behaviors and adsorption characteristics of alkali lignin solutions were analyzed, with urea as the hydrogenbond-breaking agent. The results indicate that, with the continuous addition of urea, the breaking degree of hydro-gen bond increases and the infrared spectrum of hydroxyl groups moves to the high-wavenumber range, and that asmall dosage urea mainly results in the break of hydrogen bonds between alkali lignin and water, thus decreasingthe particle size as well as the reduced viscosity of the alkali lignin-urea mixture, and increasing the adsorption ca-pacity as well as the surface roughness. However, contrary phenomena are observed at large urea dosage becausethe intramolecular hydrogen bonds may break in this condition.

Key words: alkali lignin, urea, hydrogen bond, adsorption, solution behavior

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