Effect of rhamnolipids on cadmium adsorption by Penicillium simplicissimum

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. simplicissimum and at pH 5.0 for the RL-pretreated P. simplicissimum , respectively. The adsorptio...

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Bibliographic Details
Published in:Journal of Central South University 2012-04, Vol.19 (4), p.1073-1080
Main Authors: Yuan, Xing-zhong, Jiang, Li-li, Zeng, Guang-ming, Liu, Zhi-feng, Zhong, Hua, Huang, Hua-jun, Zhou, Mei-fang, Cu, Kai-long
Format: Article
Language:English
Subjects:
Engineering
Metallic Materials
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Summary: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. 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 ( q max ) for the intact P. simplicissimum and for the RL-pretreated P. simplicissimum were 51.6 and 70.4 mg/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.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-012-1111-5