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Vol. 25 No. 2 (2013): Vol 25 Issue 2

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Kinetic and Equilibrium Modeling of Lead(II) Sorption onto Chemically Pretreated Gossypium hirsutum (Cotton) Leaves Waste Biomass

https://doi.org/10.14233/ajchem.2013.13610
Muhammad Riaz
Department of Chemistry and Biochemistry, University of Agriculture, Faisalabad-38040, Pakistan ; Department of Chemistry, Government College University, Faisalabad-38000, Pakistan
Raziya Nadeem
Department of Chemistry and Biochemistry, University of Agriculture, Faisalabad-38040, Pakistan
Muhammad Asif Hanif
Department of Chemistry and Biochemistry, University of Agriculture, Faisalabad-38040, Pakistan
Nasir Rasool
Department of Chemistry, Government College University, Faisalabad-38000, Pakistan
Rashid Saeed
Department of Management Science, COMSATS Institute of Information Technology, Sahiwal Campus, 57000, Pakistan
Muhammad Idrees Jilani
Department of Chemistry and Biochemistry, University of Agriculture, Faisalabad-38040, Pakistan
Tahira Iqbal
Department of Chemistry and Biochemistry, University of Agriculture, Faisalabad-38040, Pakistan
Muddassar Zafar
Department of Chemistry and Biochemistry, University of Agriculture, Faisalabad-38040, Pakistan

Corresponding Author(s) : Raziya Nadeem

raziyaanalyst@gmail.com; raziyaanalyst@yahoo.com

Asian Journal of Chemistry, Vol. 25 No. 2 (2013): Vol 25 Issue 2

Abstract

Equilibrium and kinetic aspect of lead(II) biosorption onto chemically pretreated G. hirsutum (cotton) leaves waste biomass was investigated in the present study. The lead(II) sorption was found dependent on solution pH, initial lead(II) concentration, temperature and contact time. The chemical pretreatment of biomass resulted in significant enhancement and reduction in sorption capacity depending on the nature of pretreatment. Results revealed that chemical modifications of G. hirsutum (cotton) leaves waste biomass with alkali, inorganic salts, organic salts and organic solvents enhanced the adsorption capacity, while acidic pretreatments caused reduction in adsorption capacity. The sorption data was fitted well to Langmuir isotherm and kinetic data to pseudo second order model, due to higher value of correlation coefficient (R2). The effect of contact time showed that sorption of lead(II) occurred rapidly within first 0.5 h followed by slow adsorption till equili-brium. Present research work illustrated an effective and economical biosorbent for the removal of toxic heavy metals from aqueous solutions.

Keywords

Biosorption Lead(II) Chemically Pretreated G. hirsutum
Riaz, M., Nadeem, R., Asif Hanif, M., Rasool, N., Saeed, R., Idrees Jilani, M., … Zafar, M. (2012). Kinetic and Equilibrium Modeling of Lead(II) Sorption onto Chemically Pretreated Gossypium hirsutum (Cotton) Leaves Waste Biomass. Asian Journal of Chemistry, 25(2), 1111–1116. https://doi.org/10.14233/ajchem.2013.13610
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