Etude de la fonctionnalisation de la surface de quelques supports adsorbants

Abstract

The commercial activated carbon of Merck was treated with KOH (10%), H2SO4 (96%) and K2CO3 (30%) and the commercial activated carbon of Riedel de Haen with NaOH (2N), citric acid (1M) and ammonium oxalate (10%) at different temperatures and time of impregnation and adsorption tests were performed on nickel and methylene blue by treated and untreated activated carbon of Merck and blue bemacid E-TL by treated and untreated activated carbon of Riedel de Haen for coal. Activated carbon treated with a higher percentage of the disposal after the adsorption tests compared untreated coal were characterized for their surface chemistry by infrared spectroscopy, X-ray diffraction and their structures and pHzpc and porous morphology by scanning electron microscopy (SEM), iodine index and the specific surface area by the methylene blue method. Activated carbon from Merck and Riedel de Haen were treated compared to untreated for adsorption of nickel, methylene blue and blue bemacid, experiments and studied in a batch system as a function of pH of the solution, time contacting and the dose of the adsorbent. Adsorption isotherms were studied at room temperature on each of the adsorbents, the experimental data obtained and reproduced by simulating the equations of Langmuir isotherms, Freundlich and Temkin their linear model. The typical Langmuir adsorption monolayer is one that best matches the experimental adsorption isotherms with improvement rates 82, 12 and 25% for nickel, methylene blue and blue bemacid respectively. The pseudo second order model better represents the adsorption of nickel by Merck activated carbon treated with H2SO4 and methylene blue with coal treated with KOH and untreated blue adsorption with activated charcoal bemacid HR NaOH treated and untreated.