Combating dye pollution using cocoa pod husks: a sustainable approach

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 Infr...

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Bibliographic Details
Published inInternational journal of sustainable engineering Vol. 11; no. 1; pp. 4 - 15
Main Authors Olakunle, Moses Olabode, Inyinbor, Adejunmoke Abosede, Dada, Adewumi Oluwasogo, Bello, Olugbenga Solomon
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis Ltd 02.01.2018
Taylor & Francis Group
Subjects
Activated carbon
Adsorption
Adsorptivity
Aqueous solutions
Cocoa
cocoa pod husk
Dyes
Electron micrographs
Endothermic reactions
Energy consumption
Enthalpy
Entropy
equilibrium
Feasibility studies
Fourier transforms
Free energy
Infrared spectroscopy
Isotherms
kinetics
Pollution
Sustainability
thermodynamics
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Summary: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 Pseudo-first-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 ([Delta]Ho), standard entropy ([Delta]So) and standard free energy ([Delta]Go) 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.
ISSN:1939-7038
1939-7046
DOI:10.1080/19397038.2017.1393023