Combating dye pollution using cocoa pod husks: a sustainable approach

Olakunle, M.O. and INYINBOR, A.A and Dada, Adewumi O. and Bello, O.S. (2018) Combating dye pollution using cocoa pod husks: a sustainable approach. International Journal of Sustainable Engineering, 11 (1). pp. 4-15. ISSN ISSN: 1939-7038 (Print) 1939-7046 (Online)

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The adsorptive potential of activated carbon prepared by chemical activation of Cocoa pod husk (CPHAA) to remove Congo red (CR) dye from its aqueous solution was investigated in this study. CPHAA was characterised using Energy Dispersive X-Ray, Scanning Electron Micrograph and Fourier Transform Infrared Spectroscopy techniques. The effects of contact time, initial dye concentration, pH and solution temperature were studied. Equilibrium data were fitted to Langmuir, Freundlich, Temkin and Dubinin– Radushkevich isotherm models. The equilibrium data were best represented by Langmuir isotherm model, with maximum monolayer adsorption capacity of 43.67 mg/g. The kinetic data were fitted to Pseudofirst-order, Pseudo-second-order, Elovich and Intraparticle diffusion models; the pseudo-second-order kinetic model provided the best correlation. Thermodynamic parameters such as standard enthalpy (ΔHo), standard entropy (ΔSo) and standard free energy (ΔGo) were evaluated. The thermodynamic study showed that the process is endothermic, spontaneous and feasible. The mean free energy of adsorption shows that the mechanism is by physisorption. CPHAA was found to be an effective adsorbent for the removal of CR dye from aqueous solution.

Item Type: Article
Subjects: Q Science > QD Chemistry
Date Deposited: 30 Sep 2019 11:10
Last Modified: 30 Sep 2019 11:10

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