Document Type : Research Article


1 Department of Physics, Maharaja’s College, Ernakulam 682011, Kerala, India

2 Christ (Deemed to be University) Bangalore 560029, India


Green synthesis of nanoparticles has attracted great interest  in recent years because it  offers  a cost effective  and environment friendly method for the synthesis of nanoparticles. Calcium oxide (CaO) nanoparticles have potential applications in  catalysis, wastewater treatment  and biomedicine.  In the present study, CaO  nanoparticles are synthesized by an eco-friendly green synthesis via thermal decomposition of  eggshells which is a common waste material from households  and restaurants. The  synthesized nanoparticles were subjected to characterization using X-ray diffractogram (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared (FTIR) spectroscopy, photoluminescence (PL) spectroscopy and  UV-vis spectroscopy. The structural studies confirmed the formation of cubic, crystalline and irregularly shaped nanoparticles. FTIR and EDX spectroscopy indicated intensive peaks attributed to the presence of  calcium and oxygen  atoms in the prepared samples. The PL emission spectra of CaO nanoparticles consisted of a broad peak for an excitation wavelength of 320 nm. The antibacterial activity of green synthesized  CaO  nanoparticles was investigated using gram-positive Staphylococcus aureus and gram-negative E.coli bacteria. The studies showed that the prepared nanoparticles exhibit  antibacterial  property.

Graphical Abstract

A Study of the Structural, Optical and Antibacterial Properties of Green Synthesized Calcium Oxide Nanoparticles


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