Adsorption into iro-oxide coated sand is an interesting alternative for removal of
dissolved Cr(VI) in aqueous solution waste industry due to the material characteristics, the
availability this material in Indonesia and economic considerations. Many adsorption
experiments based on equilibrium research and less of them based on kinetics adsorption
research. The objective of this work was to study the appropriate kinetic model for adsorption
dissolved Cr(VI) in aqueous solution and the kinetic adsorption dependency upon
temperature. The experiment was carried out in a stirred batch flask. Iron-oxide coated sand
was contacted with Cr(VI) solution at constant temperature. Sample was drawn at certain
times and the remaining heavy metal concentration was measured by Atomic Absorption
Spectrophotometer (AAS). The results showed that the pseudo-first-order model was the
most appropriate model for explaining the adsorption of Cr(VI) solution into iron-oxide coated.
The results also indicated that temperature had significant effect to the rate constant of
pseudo-first-order adsorption model ( k1) and maximum capacity of adsorption (qe).
Keywords : iron oxide coated sand, adsorption, kinetic model
