The kinetics, equilibrium and thermodynamic of the biosorption of Cr (VI) ion onto maize husk biomass from aqueous solution were investigated. The effects of contact time, initial metal concentration, pH, temperature as well as modification with oxalic acid on biosorption capacity were studied. The maximum biosorption capacity of the untreated corn shaft biomass (UTCS) was found to be 28.49 mg g-1 which slightly increased to 29.33 mg g-1 when treated with oxalic acid treated corn shaft biomass (ATCS). The kinetics studies showed that the biosorption process of the metal ion fitted well with second order model. The calculated thermodynamic parameters (∆Go, ∆Ho and ∆S◦) showed that the biosorption of Cr (VI) ion onto the biomass maize husk is feasible, spontaneous and exothermic in nature.
ADEOGUN ABIDEEN IDOWU, OFUDJE ANDREW EDWIN, IDOWU MOPELOLA ABIDEMI, AHMED SIKIRU AKINYEYE AND SARAFADEEN OLATEJU KAREEM
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