Effect of Temperature on Removal of Ni(II) from Aqueous Solutions by Adsorption onto Fire Clay

Abstract

The removal of Ni(II) from aqueous solutions by adsorption on fire clay has been studied as a function of temperature. The amount of Ni(II) removed is highly dependent on temperature and favours high temperature, thus showing endothermic nature of the process. Also the initial concentration of adsorbate affects the extent of
adsorption significantly. The various rate parameters of the adsorption
process have been determined at different temperatures. Activation
energy of the process was found to be 34.59 kJ mol^–1. The
uptake of Ni(II) exhibited Langmuir type adsorption behaviour
which was also confirmed by regression analysis. The various
thermodynamic parameters have been calculated to reflect the
nature of the adsorption process.