短刺小克银汉霉对偶氮染料刚果红的脱色  

Decolorization of azo dye Congo red by cuuninghamella echinulata

作　　者：阮晓东[1,2] 张惠文[1] 李新宇[1] 徐明恺[1] 李旭[1] 张晓黎[1,2] 苏振成[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]中国科学院研究生院,北京100049

出　　处：《中国科学院研究生院学报》2009年第3期330-337,共8页Journal of the Graduate School of the Chinese Academy of Sciences

基　　金：中国科学院知识创新工程重要方向项目(KSCX2-YW-G-037);国家科技基础条件平台建设项目(2005DKA2120604)资助

摘　　要：为探索真菌对染料的脱色特性，利用分离得到的短刺小克银汉霉对偶氮染料刚果红进行了脱色研究．短刺小克银汉霉菌丝球能在3h内使刚果红脱色率达到96％以上．在通气脱色体系中研究了短刺小克银汉霉菌丝球在不同pH值、脱色温度、摇床转速、盐度等条件下对刚果红脱色效果的影响．研究结果表明，短刺小克银汉霉菌丝球在温度为33℃，pH6．5，摇床转速120r／min的条件下对刚果红具有最大脱色率，染料溶液中盐浓度对脱色率有一定影响，但影响不大．在刚果红50～200mg／L质量浓度范围内，小克银汉霉菌丝球对刚果红吸附脱色动力学符合拟二级动力学方程（R^2〉0．999）．菌丝球对刚果红的吸附等温线可用Langmuir和Freundlich等温方程模型表达，其中Langmuir方程能更好地描述菌丝球对染料的吸附行为（R^2〉0．999）．To investigate the decolorizational characteristics of Congo red by fungi, a fungal strain of CuuninghameUa 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（ R^2 〉 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（ R^2 〉 0.999）.

关 键 词：短刺小克银汉霉 偶氮染料 菌丝球 刚果红 脱色 

分 类 号：X172[环境科学与工程—环境科学]