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Acta Chimica Sinica ›› 2006, Vol. 64 ›› Issue (3): 255-260. Previous Articles     Next Articles

Original Articles

固定化脲酶催化作用下双醛纤维素对尿素氮的吸附平衡和动力学

梁足培，冯亚青*，梁智妍，孟舒献，刘新刚   

  1. (天津大学化工学院精细化工系 天津 300072)
  • 投稿日期:2005-01-20 修回日期:2005-10-14 发布日期:2006-02-14
  • 通讯作者: 冯亚青

Adsorption Equilibrium and Kinetics of Urea Nitrogen onto Dialdehyde Cellulose under Catalysis of Immobilized Urease

LIANG Zu-Pei, FENG Ya-Qing*, LIANG Zhi-Yan, MENG Shu-Xian, LIU Xin-Gang   

  1. (School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072)
  • Received:2005-01-20 Revised:2005-10-14 Published:2006-02-14
  • Contact: FENG Ya-Qing

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The adsorption of urea nitrogen onto dialdehyde cellulose (DAC) under catalysis of immobilized urease in gelatin (IU) was studied in batch system. The equilibrium of urea nitrogen adsorption onto DAC with different degree of oxidation (DO) and the kinetics of adsorption with respect to the DO of DAC, the initial urea nitrogen concentration, temperature and DAC/IU weight ratio were investigated. Equilibrium data were fitted very well to the Langmuir mode in the entire saturation concentration range, indicating that the adsorption was of monomolecular layer and chemical adsorption. The DO of DAC, initial urea nitrogen concentration, temperature and DAC/IU weight ratio affected significantly the adsorption capacity. The experimental data were fitted well to the second-order kinetic mode, indicating that the adsorption process followed the second-order kinetic mode. The rate constants were evaluated, with the apparent activation energy of 6.0 kJ•mol－1 for the adsorption of the urea nitrogen onto DAC under catalysis of IU at DO 88% of DAC, initial urea nitrogen concentration 638.3 mg•L－1 and DAC/IU weight ratio 10∶1.

Key words: adsorption equilibrium, kinetic, urea nitrogen, dialdehyde cellulose, immobilized urease