SPECTROSCOPIC STUDIES OF THE IRON NANOPARTICLES (Fe-NPs) DERIVED FROM EUCALYPTUS LEAVES EXTRACT AND ULTRASONIC WAVE ASSISTED METHOD
Keywords:
Iron nanoparticles, eucalyptus leaves extract, ultrasonic wave, green synthesis, X-ray Absorption Spectroscopy, X-Ray Photoemission SpectroscopyAbstract
This study aimed to investigate the characteristics of iron nanoparticles (Fe-NPs) synthesized using a green synthesis and ultrasonic wave irradiation. According to the availability of eucalyptus leaves in northeastern Thailand and many studies on non-chemical extract, the eucalyptus leaves extract was applied as a reducing reagent. The Fe-NPs were synthesized by mixing the eucalyptus leaves extract and 0.1 M FeSO4 aqueous solution with an applied ultrasonic wave at a constant power of 1,000 W with a frequency of 20 kHz.The properties of the synthesized sample were characterized by various techniques such as field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), Fourier transform infrared (FT-IR), and X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). X-ray absorption spectroscopy (XAS) was also used to measure the oxidation state of the material. The mean diameter of the iron nanoparticles (Fe-NPs) derived from eucalyptus leaves extract and ultrasonic wave (Fe-NPs-EL-UL) 1,000 W was 29±5 nm, smaller than that of the iron nanoparticles (Fe-NPs) derived from eucalyptus leaves extract (Fe-NPs-EL). FT-IR analysis confirmed the covering of oxidized polyphenols on the surface of Fe-NPs. The surface chemical compositions and chemical states of the element of the synthesized sample were analyzed by XPS. The characteristic peak of Fe0 at around 706 eV was not detected. However, XRD showed amorphous material and XAS indicated the presence of Fe2O3 (Hematite).
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