Biosynthesis of pure and MnSO4 (II) doped CeO2 nanoparticles: Electrochemical studies and its antibacterial activity

Abstract

Cerium oxide (Nanoceria) nanoparticles were synthesized by green synthesis method using Manganese Sulphate (MnSO4)as a dopant with various concentrations. Different physicochemical methods were used to analyse the nanoparticles, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Field emission scanning electron microscopy (FE-SEM), Energy dispersive X-ray analysis (EDAX), UV–Visible spectrophotometer (UV–Vis), and Photoluminescence (PL) investigations for optical activity. The cubic fluorite structures of the CeO2 nanoparticles were determined by XRD with a typical crystallite size of 18 nm for undoped CeO2 and 12 nm for MnSO4/CeO2. FTIR spectroscopy analysis the presence of CeO2 phase by examining structural bond vibrations with intense bands. FE-SEM images divulges the prepared nanoparticles have a cubic structure and are uniformly allocated with small clusters. The optical activity of the synthesised sample was evaluated, and it reveals UV absorption from 200 to 1200 nm. The band value was estimated using the optical spectrum. While PL Studies reveals a broad intensity peak at 340 nm with increase in doping concentration. Furthermore, the aim of the present study is capacitive characteristics were analysed by Cyclic voltammetry (CV) which deliver prominent capacitance value of 479 F/g at a scan rate 10 mV/s. Antibacterial activity of MnSO4/CeO2 nanoparticles have also been demonstrated against E. coli and Enterobacter (gram. −ve) bacteria were comparatively subjected than Bacillus subtilis (gram +ve) pathogenic bacteria.