Zinc molybdate nanoparticles with molybdate synthesized through green method with different salt precursors using Moringa Oleifera leaf extract. Those nanoparticles had structural, vibrational and morphological properties, which determined by X-ray diffraction (XRD). The crystalline size of synthesized zinc molybdate was 24.9 nm. Fourier transform infrared spectroscopy (FTIR) spectroscopy and field emission scanning electron microscopy (FE-SEM) clearly showed the attachment of molybdate with ZnO. The synthesized nano material also characterized through UV-visible spectroscopy which had 4.40 eV band gap energy. Those nanoparticles also characterized via thermogravimetric analysis (TGA-DTA) and photo luminance spectroscopy (PL). ZnMoO₄ had photocatalytic property via methylene blue dye. After 190 minutes, dye converted into colourless from blue colour. The degradation efficiency was around 92.8 %. It also showed their antibacterial effect via Escherichia coli and Streptococcus aureus bacterial strains. In presence of light and air, nanoparticles of ZnMoO₄ inhibit the growth of cells of E.coli and S. aureus both bacterial strains because ROS (reactive oxygen species) generation. Because of formation of singlet oxygen (O₂^*-), hydrogen oxide radical (-OH^*) and hydrogen peroxide (H₂O₂), ZnMoO₄ showed photo-degradation reaction against aq. solution of methylene blue dye at 6 pH with constant time interval. With time the activity of ZnMoO₄ also decreased because generation of a layer of hydrogen oxide (-OH) on nano material surface, which could be washed with ethanol and distilled water. After dry, that catalytic Zinc molybdate nanoparticles could be again reuse in next catalytic reaction.

Bhawana Jain

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