Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (1): 95-99.doi: 10.3969/j.issn.1000-565X.2013.01.015

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

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)

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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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