Zn-MnO Nanocomposites Derived from Cocos Nucifera: A Multi-Analytical Characterisation and Antimicrobial Study

Structural and morphological properties of nanocomposites make them suitable for biogenic and bioscience applications, in batteries and sensors. The synthesis of Zn-MnO nanocomposites through a green route helps to mitigate ecological deterioration. In the present study, a nano Zn-MnO composite material was synthesized via a green route using the Cocos nucifera shell extract as a reducing and capping agent. The synthesized material was calcined at ۴۵۰, ۵۵۰, and ۶۵۰ ℃, and subsequently characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-Ray analysis (EDAX), ultraviolet visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and Zeta potential. Antimicrobial activity was also evaluated. XRD patterns revealed that as the calcination temperature increased, the peaks became sharper, representing the increased crystallinity and crystalline size: ۱۵, ۱۶ and ۱۹ nm, respectively. Peculiar peaks were observed in the UV-Vis spectra with slight variation at ۲۷۲, ۲۷۸, and ۲۸۸ nm. Optical conductivity was found to be ۲.۴۶۶ x ۱۰۹ S-۱. Zeta potential values were determined to be -۹, -۱۰, and ۱۶ mV, respectively. The band intensity in Raman spectra increased as the calcination temperature rose, suggesting greater phonon coupling and improved crystallinity. FTIR spectral analysis confirmed that Zn–MnO nanoparticles have interacted with organic substances that contain nitrogen, including proteins or amino acid residues, which are likely products of biological agents used in synthesis. Antimicrobial studies showed a maximum inhibition zone of ۲۲ mm against S. aureus and ۱۹ mm against A. niger. Minimum inhibitory concentration (MIC) results indicated effective bacterial inhibition at ۲.۵% and fungal inhibition at ۵% concentrations.

کلیدواژه ها:

Nano Zn-MnO composite ، Cocos nucifera ، Zeta potential ، Antimicrobial activity