Biosynthèse et Application des Nano-composites d’Oxyde de Nickel (NiO)

Abstract

In this work sepiolite / nickel oxide (NiO) nano-composites were prepared by a green method . In the first part, NiO nanoparticles are synthesized in the presence of sepiolite in aqueous solution by the bioreduction of nickel sulfate with the extract of a medicinal plant (Mantha Aquatica). In the second part, the nano-composites as prepared are used as a catalytic support for the purification of water loaded with cationic dye (methylene blue). The influence of different parameters such as temperature, mass and contact time were studied. The study of the kinetics as a function of concentration showed that the percentage removal of methylene blue increases as the mass of the catalyst increases. The values of ΔG° and ΔH° show that the degradation process is spontaneous and endothermic.