Comparative Study of Removal of Chromium -IV Ion from Aqueous Solution Using Eucalyptus, Neem and Mango Leaves

The present work was focused on investigation of effect of solution concentration, contact time and pH variation on ability of the eucalyptus, neem and mango leaves in removing chromium ions form aqueous solution. The dried leaves were washed with deionised water, air-dried and ground using ball mill then sieved. The leaf powder was added to 1M stock metal ion solution made from potassium dichromate. The concentrations, contact time and pH of each stock solution were varied. These mixtures were shaken at a constant rate of 250 rpm, filtered and analyzed by Avanta Atomic Absorption Spectrophotometer. All the experiments were carried out in duplicated and the average value were used for further calculation. For Cr-VI, the maximum adsorption was obtained at pH 2 and 7, agitation rate of 150 rpm, particle size of 75 m, initial concentration of Cr ions of 5 mg/l and contact time 20 min.