This paper reports the use of Simbang Darah (Iresine herbstii) leaf extract to synthesize ZnFe 2 O 4 spinel ferrite nanoparticles via hydrothermal method. Biochemical compounds in Simbang Darah leaf extract act as a capping agent and a stabilizer to form nanostructures. XRD patterns and FTIR spectrums confirm the formation of the cubic spinel crystal structure of ZnFe 2 O 4 nanoparticles. SEM and TEM characterization revealed that ZnFe 2 O 4 spinel ferrite morphology has a uniform spherical shape in nanoscale. EDX results showed that the compositional mass ratios were relevant as expected from the synthesis. ZnFe 2 O 4 nanoparticles have an absorption edge in the visible region with Eg values within the range 2.05-2.11 eV in the DRS UV-Vis analysis. The as-prepared samples exhibit paramagnetic behavior according to the magnetic hysteresis curve. ZnFe 2 O 4 nanoparticles were proven effective in direct red 81 dye photodegradation (99.66%) after exposure to solar light irradiation for two hours. On top of that, ZnFe 2 O 4 nanoparticle exhibited antibacterial activity against S. aureus and E. coli.
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