Effect of rhamnolipids on cadmium adsorption by Penicillium simplicissimum  

作　　者：袁兴中 姜丽丽 曾光明 刘智峰 钟华 黄华军 周梅芳 崔凯龙 

机构地区：[1]College of Environmental Science and Engineering,Hunan University [2]Key Laboratory of Environment Biology and Pollution Control,Ministry of Education,Hunan University

出　　处：《Journal of Central South University》2012年第4期1073-1080,共8页中南大学学报（英文版）

基　　金：Project(50978087) supported by the National Natural Science Foundation of China;Project(CX2010B157) supported by the Hunan Provincial Innovation Foundation for Postgraduate,China

摘　　要：The effect of rhamnolipids （RL） on Cd^2＋ adsorption by Penicillium simplicissimum （P. simplicissimum） was studied. The maximum adsorption capacities of Cd^2＋ were obtained at pH 6.0 for the intact P. sirnplicissimurn and at pH 5.0 for the RL-pretreated P. simplicissimum, respectively. The adsorption equilibrium was reached after about 4 h. The experimental adsorption isotherms were in good agreement with the Langmuir model. The maximum adsorption capacities （qmax） for the intact P. simplicissimurn and for the RL-pretreated P. simplicissimum were 51.6 and 70.4 rag/g, respectively. The interactions between Cd^2＋ and functional groups on the cell wall surface of the P. simplicissimum were identified by SEM, EDAX and FTIR analysis. It is indicated that carboxyl, amino and hydroxyl groups play major roles in the Cd^2＋ adsorption. The results suggest that the RL-pretreated P. simplicissimum is a promising candidate for the removal of Cd^2＋ from aqueous solutions.The effect of rhamnolipids(RL) on Cd2+ adsorption by Penicillium simplicissimum(P.simplicissimum) was studied.The maximum adsorption capacities of Cd2+ were obtained at pH 6.0 for the intact P.simplicissimum and at pH 5.0 for the RL-pretreated P.simplicissimum,respectively.The adsorption equilibrium was reached after about 4 h.The experimental adsorption isotherms were in good agreement with the Langmuir model.The maximum adsorption capacities(qmax) for the intact P.simplicissimum and for the RL-pretreated P.simplicissimum were 51.6 and 70.4 mg/g,respectively.The interactions between Cd2+ and functional groups on the cell wall surface of the P.simplicissimum were identified by SEM,EDAX and FTIR analysis.It is indicated that carboxyl,amino and hydroxyl groups play major roles in the Cd2+ adsorption.The results suggest that the RL-pretreated P.simplicissimum is a promising candidate for the removal of Cd2+ from aqueous solutions.

关 键 词：ADSORPTION Penicillium simplicissimum Cd^2＋ rhanmolipids 

分 类 号：X502[环境科学与工程—环境工程]