Isotherm and Kinetic Studies of Pb(Ii) Adsorption on Raw and Modified Diatomite by Using Non-Linear Regression Method

Abstract

This study presents the evaluation of the original diatomite (D-O) and manganese oxide modified (D-mn) diatomite used as adsorbents for Pb (II) removal from aqueous solution. The experimental data were fitted to the non-linear two parameter equation of Langmuir, Freundlich, Dubinin-Radushkevich, and non-linear three parameter equation of Redlich-Peterson, Sips and Toth Isotherms. The correlation coefficient (R-2), standard error (S.E) and Chi-square (x(2)) values were used to select the best theoretical isotherm. Adsorption mechanism of Pb(H) ion onto the D-O was explained by heterogeneous adsorption model while homogenous adsorption model was used to explain the adsorption on D-mn. Also, both adsorbents were observed to comply better with the three-parameter isotherms. Pseudo first-order, pseudo second-order, Elovich and intraparticle diffusion equations were used to describe the adsorption rate of Pb(II). The experimental data were well fitted by the pseudo second-order kinetic model. Thermodynamic parameters such as free energy (Delta G degrees), enthalpy (Delta H degrees) and entropy (Delta S degrees) showed spontaneous and endothermic in nature of adsorption for both of adsorbents.