| Title |
Adsorption Treatment Characteristics of Cadmium Ion Containing Wastewater Using Waste Tire as an Adsorbent |
| Authors |
백미화 ( Mi Hwa Baek ) ; 김동수 ( Dong Su Kim ) |
| Keywords |
Adsorption; Cadmium ion; Waste tire; Wastewater treatment |
| Abstract |
Adsorption features of Cd(2+) on waste tire particles have been investigated for the purpose of enhanced wastes recycling along with the development of an economic process for wastewater treatment. The isoelectric point of waste tire particles was found to be ca. pH 7 and the adsorbed amount of Cd(2+) was increased with pH under experimental conditions. The variation of the adsorption behavior of Cd(2+) with pH was well explained by the change of the electrokinetic potential of waste tire particles according to the pH. Adsorption of Cd(2+) was observed to reach its equilibrium within 45 minutes after the adsorption started under experimental conditions and followed the Freundlich model well. Kinetic analysis showed that the adsorption reaction of Cd(2+) was second order and thermodynamic estimation substantiated the endothermic behavior of Cd(2+) adsorption. As the amount of adsorbent increased, more adsorption of Cd(2+) was accomplished and the adsorption capacity of adsorbent was found to be enhanced by its pre-treatment with NaOH. Also, the adsorption of adsorbate was promoted as the ionic strength of wastewater was increased. |