Synthèse et caractérisation des matériaux modifiés : application à l’élimination des micropolluants

Abstract

The objectives of the study were to find the type and species of material which gives optimum adsorption of pollutants, provide an explanation of the mechanism involved in the adsorption process. Adsorption of benzoic and salicylic acid onto organo-montmorillonites and heterostructured montmorillonite was conducted at initial acid concentrations of 10, 30, 50 and 100 mg/L at initial pH of 3 and 4. Langmuir, Freundlich and Toth models were used in analyzing the equilibrium data and selectivity sequence derived from the Langmuir and Toth calculation was Mt162CEC > Mt161CEC > PCH-HCl > Mnt-Na. Mt16-2CEC had high adsorptive capacities of 145 mg/g and 155 mg/g, respectively for benzoic and salicylic acid. The adsorption capacity of acid was largely influenced by the CEC of the sample. The adsorption mechanism was based on the hydrophobic-hydrophobic interactions and electrostatic interactions. These results are important in selecting the most effective and suitable adsorbent for benzoic and salicylic acid removal from polluted environments.