Investigation on the Ability of a Natural Adsorbent Corn Stalk in Removing Heavy Metal Ions From Aqueous Solution
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The prospect in using a bio-adsorbent corn stalk to remove metal ions from solution in batch operation was investigated. Corn stalk with shapes variation has ability to remove single metal ion in aqueous solution over than 80%. In binary metal ions solution, the competition of Cd2+ and Cu2+ to adsorb on adsorbent surface at pH 4.5 was then studied. With concentration variation ratios such as: 20:40; 30:30 and 40:20 were found: Cd<Cu; Cd>Cu and Cd>Cu respectively. The total removal ability was almost the same at 62.5% for each concentration variation. The adsorption kinetic results are appropriate with the second order of kinetics equation model and diffusion equation model. It is indicated that the interaction of metal ions on corn stalk occurs chemically. The adsorption tends to take place on porous area of the adsorbent. The adsorbed diffuse to internal site of adsorbent. The ability of corn stalk to adsorb the metal ion shows its potential as a natural adsorbent.