Driza, MerouaneBrahim, AyaBOUSSALAM, Smail2025-07-072025-07-072025http://dspace.univ-temouchent.edu.dz/handle/123456789/6462In this thesis, sepiolite/palladium (Pd) nanocomposites were prepared using a green chemistry approach. In the first part, the nanoparticles (Pd) were synthesized in the presence of sepiolite in aqueous solution using a medicinal plant extract (henna). In the second part, the nanocomposites thus prepared were used as catalytic support for the purification of water loaded with cationic dye (methylene blue). The influence of different parameters such as mass, concentration, and intensity were studied. The experiment using Pd/Sep (3 mg, 10–5 mol/l, 120 min, 75 W lamp) clearly stands out for its high efficiency with the minimum amount of photocatalyst, thus demonstrating remarkable catalytic performance.frThesis