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Adsorption of Copper(II) and Chromium(VI) Metal Ions from Aqueous Solution using Barks of Moringa oleifera lam. as Adsorbent

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Author Affiliations

  • 1 Laboratory of Applied Inorganic Chemistry, Faculty of Sciences and Technology, Marien Ngouabi University, P.O. Box 69 Brazzaville, CONGO

Int. Res. J. Environment Sci., Volume 4, Issue (10), Pages 43-50, October,22 (2015)

Abstract

The removal of copper(II) and chromium(VI) metal ions from aqueous solution was studied by the technique of adsorption on the barks of moringa oleifera, under various experimental conditions. The effect of some parameters as pH of solution, contact time and adsorbent mass were examined. The results obtained showed that the quantity of each adsorbed metal increases with contact time and adsorbent mass. To obtain a high quantity of adsorbed metal, the pH of the solution was 5 for each ion, the contact time was two hours for copper(II) ion and four hours for chromium(VI) ion, and the adsorbent mass was 16 g/L for each ion. Under optimal conditions, it was found that the amount of removal metal was 91.53% for copper(II) and 90% for chromium(VI) ions. The models of Langmuir and Freundlich isotherms were used to determine the different equilibrium parameters for the distribution of metal ion between solution and adsorbent. The value found for Langmuir constants were respectively 0,14 L/mg for copper(II) ion and 0,36 L/mg for chromium(VI) ion, whereas the Freundlich constants were respectively 0,5 L/mg for copper(II) ion and 0,34 L/mg for chromium (VI) ion. The determination of maximum adsorption capacity by using the Langmuir isotherm gave a value of 3,10 mg/g for copper(II) ion and 1,39 mg/g for chromium(VI) ion , showed that adsorption followed the order Cu(II) > Cr(VI).

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