Adsorption of nickel on flyash in natural and acid treated forms.

Abstract

Studies on removal of Ni2+ by adsorption on flyash and acid treated flyash have been carried out at room temperature (30+/-1 degrees C). The adsorption isotherm of Ni2+ on flyash and acid treated flyash was obtained in a batch reactor. Various parameters such as pH, initial concentration of adsorbate and adsorbent dose were studied. The experimental adsorption data fitted reasonably well to Langmuir, Freundlich and Redlich - Peterson isotherms for both the adsorbents. The adsorption follows Lagergren first order kinetic model. The monolayer adsorption model are found to be 41.7 and 62.9 mg/g respectively. Acid treated flyash has been observed to have greater adsorptive capacity than flyash in natural form.