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This study researched about making activated carbon from waste tires, and the characteristics of adsorbing heavy metals (Cu2+, Cd2+, Pb2+) from a water solution using the activated carbon. As for pore structure, meso- or bigger pores were developed relatively more than micro-pores, and the BET surface area was shown as 70.705 m2/g. Heavy metal adsorption of activated carbon produced from waste tires was more superior than other commercial activated carbon. The reason for this is that the primary adsorption mechanism was replacement and ion exchange of sulfur (S) and zinc (Zn) which exist in the carbon black on the adsorption action site. An important variable of the adsorption action was the pH of the adsorption solution, whereas the temperature had little effects. In this study the adsorption solution was made for its pH to be 1.8, 3.0, and 5.0, and the temperature was changed to 15℃, 25℃, and 35℃ while performing the adsorption experiment. The capacity of adsorption equilibrium about heavy metal by activated carbon from waste tire, increased as the pH and temperature of the solvent increased. The adsorption of heavy metal is an endothermic reaction, and it is noticeable that chemical adsorption is more predominant than physical adsorption. Also under the same conditions the strength of adsorptive power was Pb2+ > Cu2+ > Cd2+ in order and Pb2+ and Cu2+ showed a similar tendency. The adsorption equilibrium isotherm of Cu2+, Cd2+, and Pb2+ was well delineated by Sips and Freudlich formula, and the Freudlich formula was more suitable. In conclusion, the study showed that the activated carbon from waste tires had high affinity and selectivity for bivalent heavy metal ion in the solution, and it is also considered to be commercially applied to the pre-treatment of wastewater.

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