Study of Hexavalent Chromium Ion Adsorption on the Surface of Activated Carbon Prepared from Safflower Plant Waste

Abstract

In this research, the adsorption of hexavalent chromium ions on the surface of activated carbon prepared in the laboratories of the Faculty of Sciences from safflower plant waste and activated with different ratios of potassium hydroxide (KOH:Carbon) (1:1-1:2-1:3-1:4) was studied. The activation process was carried out at a temperature of 700°C, where the adsorption capacity reached its maximum value when the activation ratio was (1:4) (KOH:Carbon). The isothermal adsorption curves were studied and it was found that the adsorption of hexavalent chromium ions on the activated carbon follows the Freundlich model. The optimal experimental conditions affecting the adsorption of hexavalent chromium ions on activated carbon, including contact time, solution pH, medium temperature, amount of carbon used, and concentration of hexavalent chromium ions, were studied. It was found that the adsorption is best in acidic media at room temperature, and that the amount of 0.05g of carbon gave the best adsorption value