Biosorption of heavy metals Cadmium(II) and Arsenic(III) from synthetic waste water solution using Punica granatum L.
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Date
2019-05
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
In recent times, heavy metals, generally Cd(II) and As(III) has received a great deal of attention because of its high toxicity. The aim of present study was to examine the biosorptive capability of fruit peel of Punica granatum, collected from plains of Uttarakhand. The effective removal of heavy metals from aqueous wastes is among the most important issues for many industries. Fruit peel waste is abundantly available from
the agricultural and food processing industry and has been studied in recent times as an adsorbent. Fruit peels biosorbents are characterized for their low cost, less expensive and high bioremoval capacity. Pomegranate peel is an important source of natural phenolic compounds. GC-MS showed that these biosorbents contains polysaccharides, proteins and lipids, and functional groups like carboxylic, hydroxylic, sulphate, and amino that act to bind metal ions. Pomegranate peels were used to remove Cd(II) and As(III) from synthetic wastewater. AAS results showed that the best adsorption for Cd(II) was obtained in contact time of 60 minutes and As(III) in 90 minutes at acidic pH and 45±5ºC temperature.
The maximum removal of Cd(II) and As(III) at 25±5ºC and 45±5ºC temperature by P. granatum was recorded to be 35% and 69%, 52% and 73% respectively. As(III) was found to have more affinity to pomegranate peels. Langmuir, Freundlich and Temkin adsorption isotherm models were used to explain adsorption phenomenon of Cd(II) and As(III). The powder was regenerated and found to exhibit binding capacity upto four cycles as indicated by AAS. Adsorption kinetics data were modeled using the pseudo-first order, pseudo-second order and Elovich equations models. The results indicate that the secondorder model best describes adsorption kinetic data. The FT-IR analysis revealed that the main functional groups involved in biosorption were carboxyl, carbonyl, amino, alcoholic and phenol. Thus, it can be concluded that dried powder of pomegranate fruit peels, a waste material, possess good potential as an adsorbent to remove toxic metal ions like Cd(II) and As(III) and therefore can be used in the treatment of contaminated wastewater for removal of toxic metals.
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