New Electrospun ZnO:MoO3 Nanostructures: Preparation, Characterization and Photocatalytic Performance

Abstract

New molybdenum trioxide-incorporated ZnO materials were prepared through the electrospinning method and then calcination at 500 °C, for 2 h. The obtained electrospun ZnO:MoO3 hybrid materials were characterized by X-ray diffraction, scanning and transmission electron microscopies, ultraviolet (UV)-diffuse reflectance, UV–visible (UV–vis) absorption, and photoluminescence techniques. It was observed that the presence of MoO3 as loading material in pure ZnO matrix induces a small blue shift in the absorption band maxima (from 382 to 371 nm) and the emission peaks are shifted to shorter wavelengths, as compared to pure ZnO. Also, a slight decrease in the optical band gap energy of ZnO:MoO3 was registered after MoO3 incorporation. The photocatalytic performance of pure ZnO and ZnO:MoO3 was assessed in the degradation of rhodamine B (RhB) dye with an initial concentration of 5 mg/L, under visible light irradiation. A doubling of the degradation efficiency of the ZnO:MoO3 sample (3.26% of the atomic molar ratio of Mo/Zn) as compared to pure ZnO was obtained. The values of the reaction rate constants were found to be 0.0480 h−1 for ZnO, and 0.1072 h−1 for ZnO:MoO3, respectively.

Nb/Starch-Doped ZnO Nanostructures for Polluted Water Treatment and Antimicrobial Applications: Molecular Docking Analysis

“…The absorbance peak for ZnO is seen at 374 nm, while the absorbance of Nb/st-integrated ZnO samples was not significantly different (only minor fluctuations (1–4 nm) in absorption spectra of doped ZnO were observed). Additionally, codoped ZnO samples showed a blue shift when compared to pure ZnO QDs. ,, The quantum confinement effect (QCE) is said to cause a blue shift in the band gap when the size of the particle is decreased in the metal oxide process. However, QCE is not the only reason; doping can disrupt symmetry and result in defects of lattice centers, which changes band architecture and cause major variations in optical characteristics .…”

“…Additionally, codoped ZnO samples showed a blue shift when compared to pure ZnO QDs. 7 , 55 , 56 The quantum confinement effect (QCE) is said to cause a blue shift in the band gap when the size of the particle is decreased in the metal oxide process. However, QCE is not the only reason; doping can disrupt symmetry and result in defects of lattice centers, which changes band architecture and cause major variations in optical characteristics.…”

Biodegradable packing food films based on PBAT containing ZnO and MoO3

“…The choice of molybdenum trioxide (MoO 3 ) and zinc oxide (ZnO) metal oxide nanoparticles was because these fillers are able to act on the microstructure of the polymer matrix, modulating optical and thermal properties and maintaining its biodegradability, without promoting microplastics formations being environmentally correct. It can also be pointed out their potential to promote electrical conductivity, antibacterial effect and water, vapor and UV barrier, which is very useful for the film industry (packaging, bags, coatings and agricultural wrappers, filters, catalysts, sanitizers, among others) 22–26 …”

“…It can also be pointed out their potential to promote electrical conductivity, antibacterial effect and water, vapor and UV barrier, which is very useful for the film industry (packaging, bags, coatings and agricultural wrappers, filters, catalysts, sanitizers, among others). [22][23][24][25][26] Thus, in this work we have prepared composites based on PBAT matrix and MoO 3 and ZnO metal oxide particles to produce new packing materials with good properties, with possible antimicrobial effect, due to the characteristics of both nanoparticles used and no microplastics formation. Then, the novelty of this work is the generation of materials with acceptable and specific properties to substitute polymer matrix that are not biodegradable polymers.…”

MoO3 Nanobelt-Modified HMCM-49 Zeolite with Enhanced Dispersion of Mo Species and Catalytic Performance for Methane Dehydro-Aromatization

“…Nanostructured MoO 3 materials have attracted extensive attention in photoelectric materials [ 20 ], heterogeneous catalysis [ 21 , 22 ], biochemical sensing [ 23 ], photothermal therapy [ 24 ], and other aspects because of its unique physical and chemical properties. The Ce-doped nano-MoO 3 modification of ZSM-5 catalyst shows excellent SCR performance [ 25 ], the ordered mesoporous α-MoO 3 nanocrystalline applied to thin film pseudocapacitors exhibits excellent capacitive charge storage performance [ 26 ].…”