Removal of lead (II) and mercury (II) from aqueous solutions and waste water using pistachio soft shell as agricultural by-products

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Research Paper 01/09/2014
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Removal of lead (II) and mercury (II) from aqueous solutions and waste water using pistachio soft shell as agricultural by-products

Zahra Aghajani, Mohamad-Reza Zand-Monfared, Somaye Bahmani-Androod
J. Bio. Env. Sci.5( 3), 170-176, September 2014.
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Abstract

In recent years, agricultural by-products have been widely regarded as metal removal from water. The object of this study is to investigate the possibility of using pistachio soft shell as low-cost effective alternative adsorbent for the removal of lead (II) and mercury (II) ions from aqueous solutions. Batch adsorption experiments were performed as a function of pH, temperature, contact time, initial metal ion concentration and adsorbent dose. Adsorption for both lead (II) and mercury (II) was found to be highly dependent on pH compared to the other parameters investigated. Obtained results gave a removal of 90.9(±2.8) % for lead (II) in the pH of 6, exposure time of 80 min at 25oC. Maximum removal of mercury (II) of 91.5(±2.1) % was obtained in pH 6 at 25oC after exposure time of 100 min.The Langmuir and Freundlich equations for describing sorption equilibrium were applied and the results indicate that the process was well described by Freundlich. Also adsorption kinetics data were modeled using the pseudo-first and pseudo-second order, it was found that the second-order model describes better the uptake of both ions. These results have demonstrated the immense potential of pistachio shell as an alternative adsorbent for toxic metal ions remediation in polluted water.

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