Kinetic and Thermodynamic study of Cd (II), Co (II), Zn (II) removal from aqueous solution by Kiwi Tree Leaves

Abstract

In this study, a perfect adsorbent presented for removal of the heavy metals Co2+, Cd2+ and Zn2+ from aqueous solution and waste water by using activated carbon prepared from agricultural waste, kiwi tree leaves. Studies agree with, Langmuir adsorption isotherm. The values of constants for the Thermodynamic and kinetic isotherms were obtained. The kinetic isotherm experiment data could be well described with the pseudo-second order kinetic model and, Thermodynamic studies indicated that the adsorption processes were exothermic and spontaneous in nature. The result of experiments showed that Cd2+, Co2+ and Zn2+ metal ions removal increased with increasing pH, amount of adsorbent and, decreased with increasing the temperature and initial concentration of solutions. It was demonstrated that the developed method based on Kiwi tree leaves is safe, easy, inexpensive, fast and trusty for eliminate of toxic metal ions from wastewater.

Keywords

• heavy metals
• low-cost adsorbent
• adsorption isotherms
• agricultural waste