Batch Kinetic and Isothermal Modelling of Copper (II) Ions Biosorption from Simulated Wastewater by a Low-Cost Mixture of Chemically Pre-treated Ripe and Unripe Plantain (Musa paradisiaca) Peel Biosorbent

Samuel E. Agarry, Kigho M. Oghenejoboh

Abstract


This study investigated and evaluated the feasibility of using a chemically pre-treated mixture of ripe and unripe plantain (Musa paradisiaca) peel as a low cost biosorbent to remove copper (II) ions from wastewater under batch mode. The effects of initial copper (II) ions concentration (100 - 400 mg/L), agitation time (30 - 180 min), agitation speed (100 - 180 rpm) and biosorbent dosage (2 - 20 g) on the biosorption process were evaluated. The results showed that biosorption of copper (II) ions was dependent on the experimental conditions. The pseudo second-order kinetic model best fitted the biosorption kinetics data of copper (II) ions to suggest chemisorption mechanism while the biosorption mechanism was film diffusion-controlled. Both the Freundlich and Dubinin-Radushkevich isotherm models provided the best correlation (R2 = 0.99) of the equilibrium biosorption data. The maximum monolayer biosorption capacity ( ) was found to be 23.81 mg/g. The biosorption process of copper (II) ions is of mixed-type biosorption (dual nature), physisorption and chemisorption with the chemisorption mechanism being more dominant. Therefore, plantain peels (mixture of ripe and unripe) has potential for application as an effective biosorbent for removal of copper from wastewaters.


Keywords


Biosorption; Plantain peel; Copper Ions; Biosorption Kinetics; Biosorption Isotherms

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