Fe3O4-CdO Nanocomposite for Organic Dye Photocatalytic Degradation: Synthesis and Characterization

Abstract

In this study, pure CdO nanoparticles, magnetic Fe3O4 nanoparticles, and Fe3O4-CdO nanocomposites were prepared via a solution combustion method using cetyltrimethylammonium bromide (CTAB) as a template. These prepared nanomaterial samples were characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron microscopy (XPS), transmittance electron microscopy (TEM), and scanning electron microscopy (SEM) analysis. XRD patterns confirmed the purity and the crystalline nature of the prepared samples. FTIR and Raman spectra observed the metal-oxygen (M-O) bond formation. UV-vis DRS studies were performed to investigate the optical properties and the bandgap energy determination. The surface morphology and the size of the pure CdO nanoparticles, magnetic Fe3O4, and nanocomposites of Fe3O4-CdO were determined via TEM and SEM analysis. Under optimum experimental conditions, the Fe3O4-CdO nanocomposites were applied for photocatalytic activity against Methylene blue dye. Under visible light irradiation, Fe3O4-CdO nanostructures showed an efficient photocatalytic degradation of 92% against Methylene blue organic dye and showed excellent stability for multiple cycles of reuse.

Syzygium aromaticum Bud Extracted Core–Shell Ag–Fe Bimetallic Nanoparticles: Phytotoxic, Antioxidant, Insecticidal, and Antibacterial Properties

“…Moreover, it was noticed that in case of FeAg alloy, the Fe and Ag peaks are merged and coexist at 65.186 for Fe and 64.428 for Ag, which can be supported by the JCPDS card number 658448 [44]. This demonstrates the face-centered cubic structure of Ag and Fe NPs, clearly emphasizing that the XRD pattern is made up of diffraction peaks of both Ag and Fe NPs, thus implying the formation of Ag-Fe BMNPs in very close accordance with already reported work [45]. As labelled with stars, the other three peaks suggest the presence of silver oxide impurities in small quantities [46].…”

Heterojunction-Based Photocatalytic Degradation of Rose Bengal Dye via Gold-Decorated α-Fe2O3-CeO2 Nanocomposites under Visible-Light Irradiation

“…Many researchers have created heterojunction composites, including α-Fe 2 O 3 @TiO 2 , α-Fe 2 O 3 @ZnO, Fe 3 O 4 -ZnO/TiO 2 , α-Fe 2 O 3 @SnO 2 , Fe 3 O 4 -CdO, and TiO 2 -CeO 2 , in an attempt to harvest solar energy, reduce the charge carrier recombination rate, and increase the photocatalytic activity [35][36][37][38][39][40]. To improve electron-hole pair separation, rare-earth oxides can be combined with α-Fe 2 O 3 [41].…”