Adsorption of Pb(II) from Aqueous Solutions on Wheat Straw: Effects of Humification and Sterilization

Document Type : Research Paper

Authors

1 Prof., Department of Soil Sciences, Faculty of Agriculture, Bu-Ali Sina University, Hamadan

2 Former Graduate Student, Department of Soil Sciences, Faculty of Agriculture, Bu-Ali Sina University, Hamadan

Abstract

Biosorption is one of the methods used for the separation of heavy metals from aquatic environments. The objective of this study was to investigate wheat straw humification and the capability of its microorganisms for the biosorption of Pb from aqueous solutions. Wheat straw (3 solution (0.001 N) with different Pb concentrations at pH 6. Among the Langmuir, Freundlich, and Temkine models, only the latter failed to fit Pb adsorption data. The highest sorption capacities (qmax) were obtained by the Langmuir model for the humified and unsterile sample (108.41 mg g‒1) and the lowest was obtained for the fresh and sterile sample (63.36 mg g‒1). Lead adsorption increased significantly with incubation time and its highest values were recorded with unsterile straw samples taken on days 1, 20, and 60 which were equal to 32.21, 43, and 60.96%, respectively, for the highest Pb concentration. The Langmuir constant (Kl) and Freundlich constants (Kf and n) were significantly higher for the more humified wheat straw samples compared to those for raw straw. All the adsorption parameters recorded higher values with the unsterile wheat straw compared to the sterile one, indicating the ability of the microorganisms to adsorb Pb from aqueous solutions.

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References

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Journal of Water and Wastewater; Ab va Fazilab ( in persian )
Volume 27, Issue 4 - Serial Number 104
serial number: 104
September and October 2016
Pages 45-55

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