Degradation of Acid Red 1 Catalyzed by Peroxidase Activity of Iron Oxide Nanoparticles and Detected by SERS

Abstract

Magnetic iron oxide nanoparticles (MIONPs) were synthesized using tannic acid and characterized by Raman, FTIR, UV, and DRX spectroscopy. In a heterogeneous Fenton-like reaction, the catalytic peroxidase-like activity of MIONPs in the degradation of Acid Red 1 (AR 1) dye was investigated. TEM/STEM was used to determine the quasi-spherical morphology and particle size (3.2 nm) of the synthesized MIONPs. The XRD powder patterns were indexed according to the reverse spinel structure of magnetite, and SEM-EDS analysis confirmed their chemical composition. At pH = 3.5, the decomposition of H2O2 in hydroxyl radicals by MIONPs results in high AR 1 degradation (99%). This behavior was attributed to the size and surface properties of the MIONPs. Finally, the Surface Enhanced Raman Spectroscopy (SERS) technique detected intermediary compounds in the degradation process.

Efficient Green Synthesis of (Fe3O4) and (NiFe2O4) Nanoparticles Using Star Anise (Illicium verum) Extract and Their Biomedical Activity against Some Cancer Cells

“…The EDS spectra of the MNPs fabricated using star-anise extract are shown in Figure 1 d, Figure 2 d and Figure 3 d. In the case of magnetite Fe 3 O 4 ( Figure 1 d), strong signal peaks at 6.2 keV and 0.6 keV for iron and at 0.5 keV for oxygen were observed. The presence of iron and oxygen verified the formation of magnetite Fe 3 O 4 MNPs [ 30 ]. Typical peaks of nickel, iron, and oxygen were noticed in the EDS spectra for the (2:1) and (4:1) spinel MNPs ( Figure 2 d and Figure 3 d).…”