Abstract
Abstract Biosorbents have recently attracted significant attention for wastewater treatment. In the present work removal of Sr (II) from aqueous solution was investigated by using waste banana peels. Maximum biosorption capacity of Banana Peels Powder (BPP) was found as 41.5 mg/g at 120 rpm, pH 7, 323 K temperature, 439 μ m sized biosorbent and contact time of 10 min. Biosorption data followed the pseudo second order kinetics among other models. Studies of biosorption isotherms indicate that the Freundlich model was appropriate to describe the biosorption process compared to Langmuir model. Thermodynamic studies expressed the feasible, favourable, spontaneous and endothermic nature of the process. Desorption of strontium ions from BPP was 66.7% by using 0.1 N HNO3 at 303 K. BPP was successfully recycled for five cycles of biosorption and desorption. SEM images were confirmed the morphological changes in BPP after biosorption and desorption. BPP characterization by FTIR explores that amino, hydroxyl, carbonyl and carboxyl groups play a major role in biosorption. This data emphasized that BPP exhibited a good efficiency for the removal of strontium from aqueous solution.
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