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2012•Chemical Science TransactionsOpen access

Influence of pH and Ionic Strength on the Adsorption of Copper and Zinc in Bentonite Clay

H.A. Bennour

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Abstract

This study concerned with the possibility of adsorption of some metal cations such as Cu 2+ and Zn 2+ on bentonite ore which were used as an inorganic fertilizer.Maximum adsorption was obtained at pH 5-5.5.The relationship between the amounts of metal cations adsorbed was found to follow the Freundlich adsorption isotherm.Preferential adsorption of both ions on adsorption sites was found to take place; Cu 2+ is being adsorbed at greater extent than Zn 2+ .Bentonite samples which allowed adsorbing Cu 2+ and Zn 2+ were then subjected to desorption experiments using EDTA/OAc.Sequential leaching of the adsorbed ions revealed that the amounts of desorbed ion are linearly proportional to the amount previously adsorbed.

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This study concerned with the possibility of adsorption of some metal cations such as Cu 2+ and Zn 2+ on bentonite ore which were used as an inorganic fertilizer.Maximum adsorption was obtained at pH 5-5.5.The relationship between the amounts of metal cations adsorbed was found to follow the Freundlich adsorption isotherm.Preferential adsorption of both ions on adsorption sites was found to take place; Cu 2+ is being adsorbed at greater extent than Zn 2+ .Bentonite samples which allowed adsorbing Cu 2+ and Zn 2+ were then subjected to desorption experiments using EDTA/OAc.Sequential leaching of the adsorbed ions revealed that the amounts of desorbed ion are linearly proportional to the amount previously adsorbed.

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Available abstract

This study concerned with the possibility of adsorption of some metal cations such as Cu 2+ and Zn 2+ on bentonite ore which were used as an inorganic fertilizer.Maximum adsorption was obtained at pH 5-5.5.The relationship between the amounts of metal cations adsorbed was found to follow the Freundlich adsorption isotherm.Preferential adsorption of both ions on adsorption sites was found to take place; Cu 2+ is being adsorbed at greater extent than Zn 2+ .Bentonite samples which allowed adsorbing Cu 2+ and Zn 2+ were then subjected to desorption experiments using EDTA/OAc.Sequential leaching of the adsorbed ions revealed that the amounts of desorbed ion are linearly proportional to the amount previously adsorbed.

Key concepts: Chemistry, Bentonite, Ionic strength, Adsorption, Zinc, Copper, Inorganic chemistry, Environmental chemistry

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Influence of pH and Ionic Strength on the Adsorption of Copper and Zinc in Bentonite Clay — Research Paper | ScholarLens