Scientific publications
2009Journal articleEnglishOpen access
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Scientific publications
Joseph Ketcha Mbadcam
Kouotou Daouda
The present paper reports the removal of cyanide ions from aqueous solutions using Cu/PAC, Ni/PAC, Cu/Clay and Ni/Clay adsorbents at pH=11. At this pH, the cyanide is completely dissociated into its ions. Equilibrium data fitted Langmuir and Freundlich isotherms well. The applicability of the isotherm equation to describe the adsorption process was judged by the correlation coefficients, R 2 , values. The Langmuir model yielded the best fit with R 2 values equal to or higher than 0.960, as compared to the Freundlich model. The fact that 1/n values range from 0.20 to 0.58 indicates that the adsorption of cyanide ions onto these metal supported adsorbents is also favored by the Freundlich model.