Operational Factors Effects On Thermodynamics Of Arsenic Removal From Aqueous Solutions

Résumé: This paper presents the mechanism and thermodynamics of adsorption of arsenic (AsaC) onto powdered eggshells (PWES). Natural and unprocessed eggshells were collected from Obafemi Awolowo University agricultural farm, Ile-Ife, Nigeria. These natural and unprocessed eggshells were cleaned using distilled water, air-dried, pulverised into powder, separated according to sieve sizes using British Standard sieves and stored in desiccators. The elemental contents and micrograph structure of the PWES were determined using standard methods. Adsorption kinetics of AsaC onto PWES were monitored using standard adsorption kinetics models. Effects of pH, particle size, mass of adsorbent and initial AsaC concentrations on the adsorption. Thermodynamic of AsaC adsorption onto PWES were studied and analysed using analysis of variance (ANOVA). The study revealed that contained Si, Fe, Al, Ca, C, K and O. It has pores at various levels. Initial concentration of AsC was a significant factor in removing AsC from water using PWES at 95 % confidence level (F3,4 = 10.24, p = 0.02). Thermodynamic parameters entropy (ΔSo),Gibbs free energy (ΔGo) and enthalpy (ΔHo) were in range of -67.67 to 117.58 J/mol.K, -35.52 to 20.53 J/mol.K and 0.43 to 105.94 J/mol.K.h, respectively. It was concluded that thermodynamics studies with modified Van’t Hott’s equation revealed that the adsorption process was endothermic and has strong affinity for AsaC

Publié dans la revue: Journal of Advanced Research in Science and Technology