Journal of Industrial and Engineering Chemistry, Vol.81, 99-107, January, 2020
Superparamagnetic NiO-doped mesoporous silica flower-like microspheres with high nickel content
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Morphology oriented synthesis of metal oxide doped silica structures have fascinating properties which needed to be explored extensively. In this work, NiO doped silica microsphere with beautiful flower-like morphology has been achieved by adopting a facile surfactant-assisted synthetic route using CTAB- ammonia in H2O.ethanol mixed solvent media. The sol.gel synthesis with effective variations of Ni/Si ratios up to 7.0, followed by a simple hydrothermal treatment and subsequent calcination leads to the formation of NiO.silica mesostructures with high nickel content. Detailed structural and elemental characterizations by using powder X-ray analysis (XRD), scanning electron (SEM) and transmission electron microscopy (TEM), N2 adsorption.desorption, X-ray photoelectron spectroscopy (XPS) revealed that single cubic phase NiO doped mesoporous silica microspheres (for Ni/Si = 5:1 and 7:1) with good surface area (169 and 205 m2 g-1 for sample with Ni/Si = 7:1 and 5:1, respectively) and pore width 3.5 nm, have been formed with 3D flower- like shape and 500-600 nm particle size. These NiO.silica microspheres containing high Ni content up to 76 wt% have shown excellent paramagnetic properties at room temperature.
Keywords:Nickel oxide;Metal-doped mesoporous silica material;Microsphere;Superparamagnetism;Nanostructure
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