An Investigation on the Synthesis of Molybdenum Oxide and Its Silica Nanoparticle Composites for Dye Degradation

Abstract

The molybdenum oxide (MoO3) and MoO3@SiO2 nanoparticles were successfully prepared using the chemical bath deposition (CBD) method. The photocatalytic activities of molybdenum oxide (MoO3), SiO2, and MoO3@SiO2 nanoparticles composite have shown a synergistic photocatalytic effect of SiO2 combined with MoO3. The first-order degradation rate constants for MoO3, SiO2, and MoO3@SiO2 nanocomposite were 10.3 × 10−3 min−1, 15.1 × 10−3 min−1, and 16.3 × 10−3 min−1, respectively. The MoO3@SiO2 composite showed degradation efficiencies in the methylene blue solution close to 100% after 60 min of UV irradiation. The X-ray diffraction (XRD) showed that the MoO3 powder has a hexagonal crystal structure and the silica is the tridymite type of SiO2. The crystallite size was about 94 nm, 32 nm, and 125 nm for MoO3, silica, and MoO3@SiO2, respectively, as calculated by the Scherrer equation. The scanning electron microscopy (SEM) images revealed that the MoO3 powder consisted of a uniform hexagonal structure; the silica showed a rod-like micro-flake morphology and the MoO3@SiO2 composite had the appearance of coral-like structures.

Anabaena sp. A‐1 mediated molybdenum oxide nanoparticles: A novel frontier in green synthesis, characterization and pharmaceutical properties

“…The MoONPs exhibit a uniform hexagonal rod‐like morphology. The regular faceted surface of each hexagonal rod is clearly visible, as depicted in Figure 6 (Kamoun et al, 2020). EDS shows the elemental composition of MoONPs as shown in Figure 7.…”

Behavior of Silica Nanoparticles Synthesized from Rice Husk Ash by the Sol–Gel Method as a Photocatalytic and Antibacterial Agent

“…From the obtained data, it can be concluded that the SiO2 NPs prepared from rice husk ash can be used as a powerful photodegradation catalyst for toxic dyes. The experimental data of kinetic behavior for photocatalytic degradation of MO using SiO2 NP photocatalyst were fitted by the first-order relation as follows [68]:…”

“…This is explained by the charge transfer from a bonding orbital of Si-O to a 2p nonbonded orbital of nonbridging oxygen [24]. According to the literature, oxygen defects or metal/metal The experimental data of kinetic behavior for photocatalytic degradation of MO using SiO 2 NP photocatalyst were fitted by the first-order relation as follows [68]:…”

Synthesis and Characterization of Highly Photocatalytic Active Ce and Cu Co-Doped Novel Spray Pyrolysis Developed MoO3 Films for Photocatalytic Degradation of Eosin-Y Dye

“…In general, it appears in three different structures such as orthorhombic (α), monoclinic (β), and hexagonal crystallographic phases. The α phase is the most stable state among them, where the phase stability and crystal structure are dictated by the MoO 6 octahedra, which are made up of six 'O' atoms and one 'Mo' atom [5][6][7][8][9]. From an application perspective, it has a variety of domains ranging from optoelectronic devices, chromism, energy storage, and catalysts.…”

“…MoO 3 thin films can be prepared using a variety of processes, which includes CVD, MOCVD, PVD, sol-gel, hydrothermal, atomic layer deposition, molecular-beam epitaxy (MBE), and spray pyrolysis [6][7][8][9][10][11][12][13]. Among these techniques, spray pyrolysis thin-film coating is a facile and low-cost approach to fabricate large-area thin-film structures.…”