Analysis of the arsenic adsorption and desorption in iron oxyhydroxides (ferrihydrite and goethite) in a dynamic system
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Arsenic present in drinking water as a contaminant poses health risks. Iron oxyhydroxide granules were used as adsorbentsto remove arsenic in a dynamic system in aqueous media. The granules were prepared with calcium alginate as a supportmedium. The results of the arsenic adsorption tests correspond to pseudo-first-order kinetics. The adsorption isothermsat various temperatures correspond perfectly to the Langmuir model. The thermodynamic parameters showed that theadsorption process is exothermic and spontaneous. The performance of a column packed with pellets to remove arsenicin an aqueous medium in a dynamic system was analyzed. The rupture curves showed arsenic adsorption capacities ofapproximately 30 mg/g for rupture times of 7 hours on average, agreeing with the experimental results with the Thomasmodel. Desorption tests for the recovery of removed arsenic showed the reusability of the column for up to three cycles.
Abstract
Arsenic present in drinking water as a contaminant poses health risks. Iron oxyhydroxide granules were used as adsorbentsto remove arsenic in a dynamic system in aqueous media. The granules were prepared with calcium alginate as a supportmedium. The results of the arsenic adsorption tests correspond to pseudo-first-order kinetics. The adsorption isothermsat various temperatures correspond perfectly to the Langmuir model. The thermodynamic parameters showed that theadsorption process is exothermic and spontaneous. The performance of a column packed with pellets to remove arsenicin an aqueous medium in a dynamic system was analyzed. The rupture curves showed arsenic adsorption capacities ofapproximately 30 mg/g for rupture times of 7 hours on average, agreeing with the experimental results with the Thomasmodel. Desorption tests for the recovery of removed arsenic showed the reusability of the column for up to three cycles.