Interaction of Pb2+ and Cd2+ with gum kondagogu (Cochlospermum gossypium): A natural carbohydrate polymer with biosorbent properties
2009
Vinod, V.T.P. | Sashidhar, R.B. | Sreedhar, B. | Rama Rao, B. | Nageswara Rao, T. | Abraham, Johny T.
Gum kondagogu (Cochlospermum gossypium), an exudates tree gum from India was explored for its potential to decontaminate toxic metals (Pb2+ and Cd2+). 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 Pb2+ (48.52 mg g−1) and Cd2+ (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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