Abstract
Gamma irradiation technique has been applied to produce non-stoichiometric nickel oxide nanoparticles (of approximately 23 nm) from gels prepared at pH about 8.2. Characterization techniques so far discussed in this investigation revealed that the sol product prepared before irradiation corresponded to Ni(OH)<sub>2</sub>, which was transformed under gamma irradiation to NiO. The present investigation has proven the efficiency of gamma rays in inducing changes in structure and morphology of the sols prepared before irradiation. The synthesised NiO nanoparticle was found to be an efficient photocatalyst for degradation of acid red G under UV light irradiation. And, finally the radiolytic mechanism production of NiO nanoparticles in aerated solutions is suggested according to the experimental result.
Highlights
IntroductionNanostructured materials have been extensively explored for the fundamental scientific and technological interests in accessing new classes of functional materials with unprecedented properties and applications
Nanostructured materials have been extensively explored for the fundamental scientific and technological interests in accessing new classes of functional materials with unprecedented properties and applications.nickel oxide (NiO), a well characterized oxide of nickel exists in two forms in nature: (i) rhombohedral, black in colour and is antiferromagnetic; (ii) cubic form, green in colour and paramagnetic in [1]
The morphology and the particles size of NiO were determined by transmission electron microscopy (TEM; Hitachi H-800), and selected area electron diffraction (SAED)
Summary
Nanostructured materials have been extensively explored for the fundamental scientific and technological interests in accessing new classes of functional materials with unprecedented properties and applications. The synthesis of metal oxides nanoparticles by gamma irradiation offers some advantages compared to those from conventional methods because it provides fully reduced and highly pure nanoparticles. The latter are free from byproducts or chemical reducing agents. The size of nanoparticles is influenced by certain parameters such as the choice of solvents and stabilizer, the precursor to stabilizer ratio, pH during synthesis, and absorbed dose This technique could hopefully, simplify the experimental process, which is an interesting strategy to produce new catalysts [2728]. The phototocatalytic activity of the synthesized NiO was performed towards the degradation of acid red G, which was chosen as a pollutant model
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