Synthesis of nickel oxide nanoparticles as an agent for antibacterial and wastewater remediation applications by calcination

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Abstract In this paper, a nickel complex with the general formula [Ni(HST)(OAc)] (HST: 1-salicylaldehydethiosemicarbazone, OAc: acetate) was subjected to thermal decomposition to produce nanoparticles at three different temperatures. The semiconductor nanoparticles have a particle size of 22.18 nm and a band gap of 2.68 eV. Furthermore, it was observed that the nanoparticles exhibiting a zeta-potential value of −26.1 are stable in colloidal media. The produced nanoparticles have the potential to be used as wastewater treatment agents under optimized conditions, as evidenced by the photocatalytic activity on methylene blue degradation with a 69.30% decomposition. Although all the synthesized compounds exhibit high antibacterial activity with low minimal inhibitory concentration values, the nanoparticles obtained by calcination at 400 °C had the highest activity, which is consistent with the literature.