Journal
NANOMATERIALS
Volume 10, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/nano10122409
Keywords
MoO3 nanoparticles; silica; nanoparticle composite; structural properties; photocatalytic properties; methylene blue
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Funding
- Deanship of Scientific Research-Research Center at King Khalid University in Saudi Arabia [GRP-95-41]
- European Union (EU) through the Education, Mobility, Research and Innovation (EMORI) program
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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 x 10(-3) min(-1), 15.1 x 10(-3) min(-1), and 16.3 x 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.
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