A kinetic and thermodynamic study of sulphate removal from AMD using fly ash

F. Ntuli, T. Falayi, M. Mabatho

Research output: Contribution to conferencePaper

Abstract

Fly ash (FA) was used as an adsorbent for SO4 2- ions in pretreated AMD (i.e., after removal of heavy metals). The adsorption experiments were done using a thermostatic shaker at varying temperatures with a 50%, 33%, and 25% m/v FA solid loading. The 50% solid loading was chosen as the best as it removed 80% of SO4 2- ions after 24 h. The adsorption thermodynamics and kinetics were best modelled by the Temkin and pseudo first order kinetic models, respectively. Thermodynamic data showed that SO4 2- adsorption was thermodynamically spontaneous at 298.15, 308.15, and 318.15 K. Enthalpy and entropy energy values were 21.2 and 8.34 J/mole, respectively, indicating an endothermic process and an affinity for sulphate ions by FA. © 2014 WIT Press.
Original languageEnglish
Pages259-266
Number of pages8
DOIs
Publication statusPublished - 2014
Event2013 International Conference on Biomedical Engineering and Environmental Engineering -
Duration: Dec 1 2013Dec 2 2013
Conference number: 1

Conference

Conference2013 International Conference on Biomedical Engineering and Environmental Engineering
Abbreviated titleICBEEE 2013
Period12/1/1312/2/13

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Coal Ash
Sulfates
Thermodynamics
Ions
Adsorption
Kinetics
Heavy Metals
Adsorbents
Enthalpy
Entropy
Experiments
Temperature

Cite this

Ntuli, F., Falayi, T., & Mabatho, M. (2014). A kinetic and thermodynamic study of sulphate removal from AMD using fly ash. 259-266. Paper presented at 2013 International Conference on Biomedical Engineering and Environmental Engineering, . https://doi.org/10.2495/ICBEEE20130331
Ntuli, F. ; Falayi, T. ; Mabatho, M. / A kinetic and thermodynamic study of sulphate removal from AMD using fly ash. Paper presented at 2013 International Conference on Biomedical Engineering and Environmental Engineering, .8 p.
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Ntuli, F, Falayi, T & Mabatho, M 2014, 'A kinetic and thermodynamic study of sulphate removal from AMD using fly ash' Paper presented at 2013 International Conference on Biomedical Engineering and Environmental Engineering, 12/1/13 - 12/2/13, pp. 259-266. https://doi.org/10.2495/ICBEEE20130331

A kinetic and thermodynamic study of sulphate removal from AMD using fly ash. / Ntuli, F.; Falayi, T.; Mabatho, M.

2014. 259-266 Paper presented at 2013 International Conference on Biomedical Engineering and Environmental Engineering, .

Research output: Contribution to conferencePaper

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AB - Fly ash (FA) was used as an adsorbent for SO4 2- ions in pretreated AMD (i.e., after removal of heavy metals). The adsorption experiments were done using a thermostatic shaker at varying temperatures with a 50%, 33%, and 25% m/v FA solid loading. The 50% solid loading was chosen as the best as it removed 80% of SO4 2- ions after 24 h. The adsorption thermodynamics and kinetics were best modelled by the Temkin and pseudo first order kinetic models, respectively. Thermodynamic data showed that SO4 2- adsorption was thermodynamically spontaneous at 298.15, 308.15, and 318.15 K. Enthalpy and entropy energy values were 21.2 and 8.34 J/mole, respectively, indicating an endothermic process and an affinity for sulphate ions by FA. © 2014 WIT Press.

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Ntuli F, Falayi T, Mabatho M. A kinetic and thermodynamic study of sulphate removal from AMD using fly ash. 2014. Paper presented at 2013 International Conference on Biomedical Engineering and Environmental Engineering, . https://doi.org/10.2495/ICBEEE20130331