Abstract
The aim of this work was to test the adsorption efficiency of copper (II) ions in an aqueous solution on Natural Smectite (NS) and Activated Carbon (AC). The experiments carried out in batch mode made it possible to determine the stirring time, the adsorbent mass, the pH, the initial concentration of copper (II) ions, the isotherms and the adsorption kinetics. It appears that the stirring time was 15 minutes for the AC and 20 minutes for the NS. The adsorption was at maximum for the two adsorbents at optimum pH of 3.5 for a mass of 0.05 g each. The quantity of copper (II) ions adsorbed was 26.6 mg/L for NS and 36.6 mg/g for AC of a concentration of 600 mg/L each. The Langmuir isotherm was the one that best described the adsorption process for the two adsorbents. The adsorption kinetics obtained was that of the pseudo second-order for our two adsorbents. The results obtained showed that these two adsorbents were effective for the adsorption of copper (II) ions in an aqueous solution.
Highlights
IntroductionHeavy metals are highly toxic species above a certain concentration
This work focused on the adsorption of copper (II) ions in an aqueous solution by a natural smectite and an activated carbon prepared from the shells of kola nuts
From the study of the adsorption parameters, it emerges that the quantity of copper (II) ions adsorbed increases with the stirring time until reaching equilibrium after 20 min for the Natural Smectite (NS) and 15 min for the Activated Carbon (AC)
Summary
Heavy metals are highly toxic species above a certain concentration They have the ability to concentrate along the food chain and accumulate in certain organs of the human body [1]. Among these heavy metals, we cite copper, which is an essential element for all living organisms including humans. The reduction in the level of copper in natural waters is significant in Gabon because of the strong activity of the exploitation of heavy metals such as copper, by the Ogooué Mining Company (Comilog) after the discharge into groundwater; and because of the growing agricultural sector (the population nowadays takes an interest in this sector of activity) with companies like Olam Gabon and the Seed Project
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