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In this study, we applied the modified cationic resin Amberlite®IRC-50 as a biopolymer adsorbent in the technique of adsorption of cationic dyes such as methyl blue (BM) and Safranin (SF) contained in wastewater models. During this technique, we studied the effects of the adsorbent dose and the neutral pH = 6.5 on the adsorption performance, knowing that the mass transfer mechanism was studied using a mass of 0.1 g of the adsorbent Amberlite®IRC50 and a concentration of 20 mg/L for the two colorants MB and SF. The results obtained with regard to the adsorption of these dyes from the present resin have shown that the modification of the surface of the cationic resin Amberlite®IRC-50 has a significant effect on the absorption and its increase has also shown that this process is more compatible with the pseudo-kinetics of the linear second degree model.

In order to optimize and reduce the rate of inorganic micropollutants discharged by various metal facilities, according to wastewater treatment standards and environmental protection, we have proceeded by studying the adsorption of heavy metals such as nickel using sea shells-Mehdia-Morocco as a natural adsorbent. After the preparation of the support, we are interested in the analysis of the physico-chemical parameters influencing the removal of heavy metals such as the kinetics (6.5 to 50 mg.L-1), the initial concentration of the nickel solutions (10 mg.L-1) and the pH of the solution (5.5 to 9.5). All the results obtained show that the adsorption process is favourable to physisorption and monolayer. First, the adsorption amount was found to be 4.05 mg.g−1. Among others, the adsorption process is expressed by the second order kinetic law (R2 = 0.999, 1 / n = 0.37). Moreover, the thermodynamic parameters after using Van't Hoff's equation showed that the studied process has an endothermic, stable and spontaneous effect (ΔG ° = −0.37 Kj.mol−1, ΔH° = 47.31 Kj.mol−1 et ΔS° = 150.56 J.mol−1). Finally, the linear isothermal models of Langmuir (R2 = 0.925), Freundlich (R2 > 0.96) and Temkin (R2 = 0.891), show that the binding and elimination of nickel by this shell is rapid with the increase of the above-mentioned parameters.