Metal oxide nanoparticles play a very important role in various fields as they exhibit interesting optical, electronic and magnetic properties. Moreover the combination of two or more metal oxides can lead to materials with multi-functional properties. Aim of my research work was to control of size, shape and homogeneity for mixed metal oxide nanoparticles, studies on their optical and magnetic properties and explore some possible applications. During my doctorate research, I have synthesized core-shell nanoparticles CuO@NiO and SiO2@NiO core-shell nanoparticles by homogeneous precipitation method, binary mixed metal oxide nanoparticles SnO2-MgO, TiO2-MgO, NiO-ZnO, NiO-CuO and NiO-MgO and aluminate nanoparticles (CoAl2O4, NiAl2O4 and CuAl2O4) by sol-gel method. The synthesized nanoparticles have been characterized using different analytical techniques as XRD, TGA, CHN analysis, FT-IR, FE-SEM, EDXA, TEM, SAED, surface area analyser, UV-Vis DRS and SQUID. Some possible applications have also been explored such as catalytic reduction of 4-nitrophenol (4-NP), photocatalytic degradation of methylene blue (MB), adsorption of MB, and destructive adsorption of paraoxon. The CuO@NiO core-shell nanoparticles show better efficiency in the reduction of 4-NP compared to that of pure NiO and CuO nanoparticles. The NiO@SiO2 core-shell nanoparticles act as better adsorbent for MB compared to pure NiO nanoparticles and silica spheres. The SnO2-MgO nanoparticles act as an efficient photocatalyst towards the photodegradation of MB. The reactivity of the metal aluminate nanoparticles was investigated using the destructive adsorption of paraoxon and catalytic reduction of p-nitrophenol.
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