A kinetic and thermodynamic study of sulphate removal from AMD using fly ash
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Subtitle: A kinetic and thermodynamic study of sulphate removal from AMD using fly ash
Author list: Ntuli, Freeman
Publisher: Hindawi
Publication year: 2014
Journal: Journal of Thermodynamics (1687-9244)
ISSN: 1687-9244
eISSN: 1687-9252
Languages: English-United States (EN-US)
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.
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