Biosorption studies of heavy metals Cadmium and Copper from waste water solution using Ficus religiosa L. leaves as bioadsorbent
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Date
2020-12
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Industrial waste constitutes the major source of various kinds of metal pollution in natural water. There are at least 20 metals which cannot be degraded or destroyed. In recent times heavy metals, generally Cd (II) and Cu (II) have received a great deal of
attention because of its high toxicity. The aim of present study was to examine the biosorptive capability of leaves of Ficus religiosa, collected from plains of Uttarakhand. The effective removal of heavy metals from aqueous wastes is among the most important issues for many industries. Plant leaves waste is abundantly used as adsorbent for the removal of toxic heavy metals from aqueous solutions as leaves have chlorophyll, carotene, anthocyanin and tannin which contribute to metal biosorption. Plant leaves
biosorbents are characterized for their low cost, less expensive and high bioremoval capacity. Peepal tree leaves were used to remove Cd (II) and Cu (II) from synthetic wastewater. AAS results showed that the best adsorption for Cd (II) was obtained in
contact time of 90 minutes and Cu (II) in 120 minutes at acidic pH and 45±2ºC temperature. The maximum removal of Cd (II) and Cu (II) at 25±2ºC and 45±2ºC temperature by F. religiosa was recorded to be 36% and 72.4%, 40% and 60% respectively. Cd (II) was found to have more affinity to peepal leaves. Langmuir, Freundlich and Temkin adsorption isotherm models were used to explain adsorption phenomenon of Cd (II) and Cu (II). The powder was regenerated and found to exhibit binding capacity upto four cycles as indicated by AAS. The results indicate that the pseudo second-order model best describes adsorption kinetic data. The FT-IR analysis revealed that the main functional groups involved in biosorption were carbonyl, carboxyl, amino, alcoholic and nitro.
Thus, it can be concluded that dried powder of peepal leaves, a waste material, possess good potential as an adsorbent to remove toxic metal ions like Cd (II) and Cu (II) and therefore can be used in the treatment of wastewater for removal of toxic metals.