Abstract
Environmental application of three different talc deposits toward the removal of hexavalent chromium ions Cr(VI) from aqueous solution as simulated polluted water was investigated. Three talc samples (T1, T2 and T3) were used from Wadi Atshan area, Eastern desert, Egypt. The affecting parameters, such as pH, contact time, solution pH and the dosage, were studied during the progress of the adsorption process of chromium (IV). The results showed that a contact time of 65 min for T3, 80 min for T2, 85 min for T1 under optimum condition at pH 7 at 25 °C. The adsorption capacity for the removal of Cr(VI) using the three samples T1, T2 and T3 was evaluated to be 78%, 86% and 97%, respectively, under optimized conditions utilizing 1.0 g/L of the adsorbent. Characterization of the three talc samples was performed using XRF, XRD and FTIR analyses in order to assess the physicochemical properties of the adsorbents. This approach provided new class of adsorbent as highly efficient materials for Cr(VI) removal based on talc deposits which possess some privileges such as availability of the natural resources that makes the process to be low cost and simple.
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