Exploration of Methylene Blue Degradation over ZnO Nanorods Mechanism using Scavenging Reagents

Abstract

Hierarchical porous flower-like ZnO structures containing ZnO nanorods were successfully synthesizedby precipitation process. The structure containing high aspect ratio nanorods was revealed by scanning electron microscopy(SEM). The EDS analysis revealed the ZnO nanostructures formation as confirmed by the Zn and O peaks. The Fourier-transform infrared spectroscopy(FTIR) spectrum indicated the Zn – O bond vibrational frequency. The typical hexagonal wurtzite ZnO nanostructure with 15 nm crystallite size and the characteristic parameters was perceived from the X-ray diffraction(XRD) data. A 10.13 m².g-1 surface area, 10.05 cm3/g pore volume and 18.25 nm pore diameter were estimated using nitrogen adsorption analysis. Bandgap energy of 3.229 eV was calculated from the optical analysis data. Under ultraviolet light irradiation, the prepared nanoparticles has effectively decolorized the methylene blue dye. The reaction obeyed the pseudo-first-order kinetics, and the degradation mechanism was proposed using radicals scavengers to determine the species involved in the photodegradation process such as isopropanol, p-benzoquinone, and dimethyl sulfoxide. The reactive oxygen atom in the mechanism of photodegradation , and the recyclability of ZnO photocatalysts were studied.

Green synthesis of ZnO-TiO2/RGO nanocomposites usingSenna surattensisextract: a novel approach for enhanced anticancer efficacy and biocompatibility

“…As observed, the bands of synthesized samples at 411.62 cm −1 and 589.78 cm −1 were related to Zn–O and Ti–O bands, respectively. 33,43,44 The peak observed at 730.70 cm −1 corresponds to the bending vibrations of the CC bonds in both the prepared ZnO-TiO 2 NCs and ZnO-TiO 2 /RGO NCs. The peaks detected at 1374.24 cm −1 and 1614.85 cm −1 were assigned to the stretching vibrations of C–O and C–H bonds, respectively, in agreement with an earlier study.…”

“…These values indicate that the bandgap energy ( E g ) of TiO 2 NPs was tailored after the addition of ZnO and RGO sheets due to the efficient charge transport and the creation of oxygen vacancies. 43 The UV findings indicate that the produced NCs may be used in photocatalytic and biological applications because of the increased absorption edge efficiency and reduced bandgap energy.…”

Efficient and Rapid Removal of Pb(II) and Cu(II) Heavy Metals from Aqueous Solutions by MgO Nanorods

“…Regarding heavy metal ion sensing, many adsorbents were used, such as metalorganic frameworks [34], carbon-based materials [35], inorganic-organic hybrid materials [36], and metal oxides [9]. To maintain thermal stability and structural order, the inorganic part of the nanocomposite plays an essential role due to its physicochemical properties [37]. Many searches were performed on the removal of Pb(II) and Cu(II) ions on various adsorbents such as biomaterials with adsorption capacity for Cu(II) (6.707 mg/g) and Pb(II) (18.79 mg/g) [15], chelating resins [38], and nanostructured lithium, sodium and potassium titanates [39].…”