Performance evaluation of calcium sulfate in adsorption process of metal ions from aqueous solutions

To evaluate the performance of the adsorption process of some metal cations from aqueous solutions on the calcium sulfate,a study was carried out on two metal cations of different valence including ni(ii) and la(iii). a series of experiments was conducted to study the influence of certain parameters such as the mass of the adsorbent,the contact time and the initial metal concentration on the adsorption capacity. the results of this study show that the adsorption of ni(ii) ions on the calcium sulfate is best described by the langmuir model with a correlation coefficient of 0,976,while that of the la (iii) ions is described by the freundlich model with a correlation coefficient of 0,875. the adsorption process follows the pseudo-second order kinetic model for both the metal cations. therefore,the calcium sulfate produced during the wet process manufacture of phosphoric acid demonstrates a favorable adsorption characteristic to the removal of metal cations (ni(ii) and la(iii)). © 2017,university of mohammed premier oujda morocco.