@article{Ayawei_Ekubo_Wankasi_Dikio_2015, title={Equilibrium, Thermodynamic and Kinetic Studies of the Adsorption of Lead(II) on Ni/Fe Layered Double Hydroxide}, volume={3}, url={https://ajouronline.com/index.php/AJAS/article/view/2369}, abstractNote={<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>}, number={2}, journal={Asian Journal of Applied Sciences}, author={Ayawei, N. and Ekubo, A. T. and Wankasi, D. and Dikio, E. D.}, year={2015}, month={Apr.} }