Abstract
Gum kondagogu ( Cochlospermum gossypium), an exudates tree gum from India was explored for its potential to decontaminate toxic metals (Pb 2+ and Cd 2+). Optimum biosorption of metals were determined by investigating the contact time, pH, initial concentration of metal ions and biosorbent dose at 25 ± 2 °C. The maximum metal biosorption capacity for gum kondagogu was observed for Pb 2+ (48.52 mg g −1) and Cd 2+ (47.48 mg g −1) as calculated by Langmuir isotherm model. Kinetic studies showed that the biosorption rates could be described by pseudo-second-order expression. The metal interactions with biopolymer were assessed by FT-IR, SEM–EDXA and XPS analysis. Results based on these techniques suggest that mechanism of metal binding by the biopolymer involves micro-precipitation, ion-exchange and metal complexation.
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