Optimisation de la synthèse de nouveaux matériaux : application à l’élimination des polluants organiques

Abstract

In this thesis, we are interested in synthesizing innovative materials that can be used as efficient and cost-effective adsorbents. First, the Ziziphus jujuba stones and orange peels were used as precursors to be treated with phosphoric acid to prepare adsorbents in powder form. Then, the two materials obtained previously (ZJS-H3PO4 and OP-H3PO4) were encapsulated using sodium alginate to obtain materials in the form of beads (BZJS and BOP). All synthesized materials were carefully characterized by different methods such as XRD, FTIR, TGA, BET, SEM, and XRF. In addition, the application of the materials obtained as adsorbents in the batch system was studied by removing basic dye methylene blue (MB). Adsorption kinetics, equilibrium studies, and the influences of different factors such as initial pH, contact time, initial concentration, ionic strength, and temperature have been explored. As a result, high adsorption capacities were obtained, confirming the efficiency of the used encapsulation process. At the end of this research, the best adsorbent of the prepared adsorbents (BZJS1) was used to employ dynamic adsorption applications (fixed and semi fluidized bed), showing interesting results. Keywords: Ziziphus jujuba, orange peels, H3PO4, encapsulation, adsorption, batch, fixed bed, semi fluidized bed, methylene blue.