Green synthesis of manganese dioxide nanoparticles: photocatalytic and antimicrobial investigations

In the present study, we report the green synthesis of manganese dioxide (MnO2) nanoparticles using Lyngbya Majuscula by the single-step co-precipitation method. The green synthesised MnO2 nanoparticles were characterised by a mix of microscopy, and spectroscopic methods such as X-Ray diffraction analysis, Fourier transform infrared Spectroscopy, Field emission scanning electron microscope, and High-Resolution Transmission Electron Microscopy, analysis. The photocatalytic degradation ability of the as-prepared sample was investigated against the methylene blue (MB) dye under different light sources such as LED, UV, and sunlight irradiation. According to the photocatalytic degradation analysis, the green synthesised MnO2 nanoparticles show high photocatalytic degradation under UV light irradiation. Similarly, the antibacterial activity of the green synthesised MnO2 nanoparticles are investigated against the Trichodermaviride, Micrococcus Luteus, Staphylococcus Aureus, Aspergillus Niger, and Pseudomonas Aeruginosa. Furthermore, the green synthesised MnO2 nanoparticles show high efficacy of the agar well diffusion method in eradicating dangerous microorganisms.