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Parametric and Kinetics Study of Hybrid Dye Uptake by Activated Mango Seed Endocarp

Abonyi MN*, Nwabanne JT, Umembamalu CJ, Igbonekwu LI, Ohale PE, Ezechukwu CM

The study investigated the parametric, isotherm and kinetic modeling of the uptake of Hybrid Dye (HD) from synthetic textile effluent using Mango seed Endocarp Activated Carbon (MEAC). The activated adsorbent (MEAC) employed was obtained from an endocarp of mango seed. Scanning Electron Microscopy (SEM), proximate analysis, Branauer-Emmett-Teller (BET), Fourier Transform Infrared (FTIR) analysis was done on the activated carbon produced. The influences of factors such as pH, initial concentration of Hybrid Dye (HD), dosage, pH and the solution temperature on HD removal were investigated. The SEM images and FTIR spectra indicated significant porosity and relevant functional groups involved in HD dye adsorption. The results obtained from BET analysis revealed that the specific surface area of MEAC before and after activation and after adsorption were 452.36 m²/g, 892.16 m²/g and 687.894 m²/g, respectively. The results indicate that adsorption process was better described by Langmuir isotherm and pseudo second order kinetic model. The thermodynamic parameters; enthalpy and Gibb’s free energy values were negative showing that the adsorption process was exothermic and spontaneous. The value of entropy obtained was negative. The negative value of entropy relates to a decrease in the degree of movement of the HD molecules adsorbed which suggest strong affinity between HD and the MEAC. The results obtained reveal potential use of MEAC and suggest its efficacy for the treatment of textile effluent. This potential of MEAC in the removal of HD from textile effluent can find great application in waste water treatment and in the management of solid waste resulting from the consumption of mango.