Journal of University of Chinese Academy of Sciences >
Decolorization of azo dye Congo red by cuuninghamella echinulata
Received date: 2008-08-01
Revised date: 2008-11-12
Online published: 2009-05-15
Supported by
中国科学院知识创新工程重要方向项目(KSCX2-YW-G-037)和国家科技基础条件平台建设项目(2005DKA2120604)资助
To investigate the decolorizational characteristics of Congo red by fungi, a fungal strain of Cuuninghamella echinulata was screened in the study of decolorization of azo dye Congo red. It was found that the decolorization rate of Congo red by Cuuninghamella echinulata mycelia pellets could be attained at 96% in 3h. Under agitated condition, the effects of initial pH, temperature, shaker speed and salt concentration on decolorization rate were studied. The results showed that the optimum pH, temperature and shaker speed were 6.5, 33℃ and 120r/min, respectively. In addition, the influence of salt concentration on the decolorization rate was slight. In the Congo red concentration range of 50~200mg/L, the decolorization kinetics of Congo red fitted with pseudo-second-order equation curve(R2>0.999). Moreover, the Langmuir and Freundlich models had been used to describe the isotherm adsorption data for Congo red onto mycelia pellets, and the parameters indicated that the Langmuir model was a better description for the isotherm adsorption(R2>0.999).
Key words： Cuuninghamella echinulata; azo dye; mycelia pellets; Congo red; decolorization
RUAN Xiao-Dong , ZHANG Hui-Wen , LI Xin-Yu , XU Ming-Kai , LI Xu , ZHANG Xiao-Li , SU Zhen-Cheng . Decolorization of azo dye Congo red by cuuninghamella echinulata[J]. Journal of University of Chinese Academy of Sciences, 2009 , 26(3) : 330 -337 . DOI: 10.7523/j.issn.2095-6134.2009.3.007
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