TY - JOUR AU - Ayawei, N. AU - Ekubo, A. T. AU - Wankasi, D. AU - Dikio, E. D. PY - 2015/04/16 Y2 - 2024/03/29 TI - Equilibrium, Thermodynamic and Kinetic Studies of the Adsorption of Lead(II) on Ni/Fe Layered Double Hydroxide JF - Asian Journal of Applied Sciences JA - AJAS VL - 3 IS - 2 SE - Articles DO - UR - https://www.ajouronline.com/index.php/AJAS/article/view/2369 SP - AB - <p>Ni/Fe-CO<sub>3</sub> layered double hydroxide of ratio 3:1 was synthesis by co-precipitation method for the adsorption of lead ions in aqueous solution. The synthesized layered double hydroxide (Ni/Fe-CO<sub>3</sub>) was then characterized by Powder X-ray Diffraction (PXRD), Fourier Transform Infrared (FT-IR) and  SEM/EDX analysis. The experimental data fitted both Langmuir and Freundlich isotherms with regression correlation coefficient values of 0.9993 and 0.9998 respectively. The essential thermodynamic parameters of DH<sup>o</sup>, DS<sup>o</sup>, DH<sub>x</sub> and E<sub>a</sub> were calculated to be -5.0496KJ/mol, 15.2J/molK, 12.6KJ/mol and -0.89KJ/mol respectively, thus showing the exothermic nature of the process and the randomness of the system. The low activation energy (E<sub>a</sub>) value is consistent with physical adsorption. The isosteric heat of adsorption DH<sub>x</sub> was calculated to be 12.6KJ/mol. The results also fitted pseudo-second order model (R<sup>2</sup>=1).</p> ER -