The present study has focused the synthesis of Fe 3 O 4 -ZnO and citric acid/glycine-modified Fe 3 O 4 -ZnO nanocomposites by coprecipitation followed by sol-gel method. The structural elucidation of modified Fe 3 O 4 -ZnO nanocomposites has revealed by XRD, SEM-EDX, FT-IR, and UV-Vis spectrophotometer studies. The analytical studies have revealed that the average crystallite size found to be 10-47 nm with spherical shape on smooth surface. The band gap energy range has found to be 1.52 to 3.12 eV. The catalytic activity of synthesized nanocomposites has undergone the oxidation of benzaldehyde, and the antibacterial activity has done using gram-negative bacteria Escherichia coli. The experimental results have concluded that the citric acid-iron oxide nanocomposite has showed the higher yield in oxidation reaction and the citric acid-iron oxide nanocomposite has showed higher efficiency in antibacterial activity comparatively.
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