Removal of Some Heavy Metal Ions from an Aqueous Systems as Mn(II) and Fe(III) Using Egg shell

Document Type : Original Article

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1 Chemistry Faculty of Science Zagazeg Universty

2 chemistry dep.

3 chemistry dep

Abstract

The adsorption technique for the process of extracting or separating heavy metal contaminants from solutions was more effective. Egg shell (ES) was identified by FT-IR spectroscopy, (SEM) and X-ray fluorescence which used to separate manganese(II) and iron(III) from an aqueous systems. pH, sorbent weights, contact time, initial concentration and temperature of manganese (II) and iron(III) were studied to obtain the most favorable conditions for removal of these ions. The results were clear that the removal of metal ions raised with increasing of contact time and sorbent weight. Also, the removal percentage decreased as the initial concentration of the two metals increased. The overall adsorption capacities of ES for manganese(II) was 35.62 mg/L and for iron(III) was 35.12 mg/L. The results showed that the removal of manganese(II) and iron(III) was enhanced under the following optimal conditions: pH 5, contact time 35 minutes, sorbent weight 0.4 g, and temperature 50 °C. The sorbent material could be effectively regenerated by using distilled water for more than five cycles. Adsorption kinetics followed the pseudo-first-order model, and Langmuir isotherm provided a good fit to the experimental data.

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