Thermodynamics and Isotherm Studies of Adsorption of Cadmium (II) on Zinc Oxide Nanoparticle

Cadmium as heavy and toxic metal is commonly found in water resource. It has made significant environmental issue. In this research, zinc oxide nanoparticle was prepared by sol-gel method, it was also evaluated with XRD, SEM techniques. Factors relevant to absorption processes such as the concentration of initial ion and temperatures were investigated. As a result, increasing the concentration and temperature, lead to increase, and decrease the absorption respectively. Thermodynamics of adsorption of cadmium (II) on zinc oxide nanoparticle at different temperatures were studied. Therefore, thermodynamic factors were shown that the absorption process was spontaneous, exothermic and reversible. The obtained absorption isotherms obviously showed that Langmuir model preferable than other models.