Biosynthesis of Manganese Nanoparticle Mn-NPs by the Fungus Aspergillus niger

Abstract The fungus isolate Aspergillus niger was obtained from the soil and in different sits from the University of Tikrit, where it was used in the preparation of manganese nanoparticles (Mn-NPs), so the results proved that the manganese solution at a concentration of (4Mm) changes color to pale yellow, and the color change is considered a preliminary indicator of the susceptibility of the fungus for the synthesis of nanoparticles. The ultraviolet and visible absorption spectrum of a solution of manganese nanoparticles was studied. It was found that it lies within the wavelengths of 421 nm and 451 nm, respectively. The results of the examination by the XR-D X-ray diffraction device confirmed the presence of nanoparticles in the solution, and the manganese nanoparticles appeared as clear particles in the transmission electron microscope (SEM) images. The results showed the size distribution of manganese nanoparticles, Mn-NPs, where they were distributed in the suspended sample at a rate of (87.39) nm, which was proportional to their density inside the solution.