Papers by Ephrem Demissie
Determination of Fluoride, Chloride and Nitrate concentration in ground water using ion selective electrode in Eastern Hararghe, Ethiopia
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International Journal of Scientific and Engineering Research, 2014
Hydrous Aluminum (III)-Iron (III)-Manganese (IV) ternary mixed oxide was synthesized by Co-precip... more Hydrous Aluminum (III)-Iron (III)-Manganese (IV) ternary mixed oxide was synthesized by Co-precipitation method. It was found that the Al: Fe: Mn sample w ith 75:15:10 w/v ratio exhibited maximum adsorption capacity for fluoride. The use of mixed oxide for investigating fluoride removal efficiency at varied condition showed that the reaction was pH sensitive and the optimum pH w as between 6.00 and 7.00. The characterization studies on the adsorbent by XRD, SEM-EDX and FT-IR analysis for fluoride adsorption were carried out to understand the adsorption mechanism. The particles were irregular in shape, highly porous. FT-IR studies revealed a little change after fluoride adsorption and showed formation of new fluorideoxygen bond on the adsorbent surface. Applicability of di fferent sorption kinetics model; w as studied. The pseudo-second order equation described all kinetic data very well. The Langmuir isotherm equation described the equilibrium very well. The thermodynamic analysis of the equilibrium indic ated that the adsorption reaction of fluoride with hydrous Al-Fe-Mn mixed oxide system for water was endothermic and spontaneous in nature. The presence of PO4-3 show ed signifi cant effect on removal efficiency of Al-Fe-Mn oxide adsorbent.
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Papers by Ephrem Demissie