Characterization and Photocatalytic Activity of Aloe Vera Extract-Stabilized MnMoO₄ Nanoparticles for Methylene Blue Degradation

The green hydrothermal synthesis of manganese molybdate (MnMoO4) nanoparticles utilizing aloe vera extract as a stabilizing and reducing agent is shown in this work. Using Fourier-transform infrared (FTIR) spectroscopy, the MnMoO4 nanoparticles were characterized. The results showed notable absorption bands connected to Mo=O and Mo–O bonds, indicating the synthesis of the intended compound. A strong absorption peak at 443 nm was found by UV-vis spectroscopy, which is crucial for photocatalytic applications. The predicted energy bandgap of 2.54 eV suggested efficient light absorption for energy conversion. Reduction in transmission below 443 nm in the transmission spectra indicates effective absorption of light, and complimentary actions that boost photocatalytic activity are shown by the computations of the extinction coefficient and refractive index. By breaking down methylene blue (MB) dye in the presence of UV light, the produced nanoparticles' photocatalytic activity was assessed, and a degradation efficiency of 41.67% was obtained. This suggests that MnMoO₄ nanoparticles have a great deal of promise for use in environmental applications, such as wastewater treatment, and as efficient photocatalysts for dye degradation, which would promote clean technologies.