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Equilibrium, Thermodynamic and Kinetic Studies on the Adsorption of lead(II) from Solution by "Agbani Clay"

Author Affiliations

  • 1Department of Chemistry (Industrial), University of Ibadan, Ibadan, Oyo State, NIGERIA
  • 2 Projects Development Institute (PRODA), Emene Industrial Layout, Enugu, NIGERIA
  • 3 Dept of Chemical Engineering, Enugu State University of Science and Technology (ESUT), Enugu, NIGERIA

Res. J. Engineering Sci., Volume 1, Issue (6), Pages 9-17, December,26 (2012)


This paper describes the adsorption of Lead(II) ions from solution by Agbani clay obtained from Nkanu west local government area, Enugu state, Nigeria. The aim of this study was to investigate the potential of Agbani clay as a low-cost adsorbent for Lead(II) ions from industrial wastewaters. The adsorption experiment was performed using batch technique to investigate the effect of pH, initial metal ion concentration, temperature and time. All these parameters proved to be useful in the description of the adsorption process. An optimum pH of adsorption was achieved at 6.0. Equilibrium isotherm models showed the Freundlich isotherm with the best fit as indicated by the regression coefficient R2 value of 0.9891, this was followed by the Temkin isotherm, (0.9121) and the least the Langmuir isotherm (0.8687). Kinetic studies revealed the Pseudo-second order with the best fit of 0.9982, although a good fit was also obtained (0.9924) by the Pseudo-first order model. Thermodynamic analysis showed a spontaneous adsorption process as negative values of ΔG° were obtained at all temperatures. The positive enthalpy change ΔH° , (14.37KJ/mol) indicated an endothermic process and an increase in adsorption with increase in temperature was observed. A highly disordered process was indicated by the positive entropy change ΔS° (62.75J/molK). The results showed the applicability of Agbani clay as a low cost adsorbent for lead(II) ions from aqueous solution.


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