Abstract
The aims of this study are to know the adsorption ability of white sand from Medan Indonesia to adsorb cadmium ions (Cd2+) from the solution at pH 4.5. The variables were on different size of white sand, the rpm of shaker and Cd concentrations. The first step was to determine the optimum contact time and adsorption capacity. The adsorption capacity on 70 ppm Cd ions with 40 mesh sand size and stirring speed 150 rpm is 38% after 100 minutes operation time. Impact of sand size 10 mesh, 20 mesh and 40 mesh is possible to increase the adsorption capacity. Increasing the rpm will impact to interaction stability the Cd ion on sand surface. White Sand has ability to interact with metal ions dissolve in solution.
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