Structural control of V.sub.2O.sub.5 nanoparticles via a thermal decomposition method for prospective photocatalytic applications

Background Recently, transition-metal oxides have represented an exciting research topic, especially their fundamental and technological aspects. Here, vanadium pentoxide nanoparticles (V.sub.2O.sub.5-NPs) were synthesized through the thermal decomposition of ammonium meta-vanadate. In the current s...

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Bibliographic Details
Published inBeni-Suef University Journal of Basic and Applied Sciences Vol. 12; no. 1
Main Authors Ashery, Marwa H, Elnouby, Mohamed, EL-Maghraby, E. M, Elsehly, E. M
Format Journal Article
LanguageEnglish
Published Springer 01.12.2023
Subjects
Adsorption
Chemical reaction, Rate of
Diffraction
Methods
Methylene blue
Nanoparticles
Technology application
Transmission electron microscopes
Vanadium
Vanadium pentoxide
X-rays
Egypt
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Summary:Background Recently, transition-metal oxides have represented an exciting research topic, especially their fundamental and technological aspects. Here, vanadium pentoxide nanoparticles (V.sub.2O.sub.5-NPs) were synthesized through the thermal decomposition of ammonium meta-vanadate. In the current study, we investigated the photocatalytic activity of V.sub.2O.sub.5-NPs to develop and regulate the V.sub.2O.sub.5 structure for adsorption applications. Results The obtained nanoparticles were inspected by X-ray diffraction, scanning electron microscope, transmission electron microscope, and differential thermogravimetric analysis, which proved the formation of the nanorod structure. The ultraviolet-visible absorption spectra revealed a 2.26 eV band gap for V.sub.2O.sub.5-NPs that correlates with indirect optical transitions. The photocatalytic activity of the V.sub.2O.sub.5-NPs was investigated by methylene blue (MB) degradation in aqueous solutions. An initial concentration of 25 ppm, a temperature of 40 °C, 40 mg of adsorbent mass, and 1 h of contact time were the optimal conditions for the efficient removal of MB that could reach up to 92.4%. The mechanism of MB photocatalytic degradation by V.sub.2O.sub.5-NPs is explained. Conclusions The photodegradation data better fit with the Langmuir isotherm model. The thermodynamic parameters indicated that the adsorption was spontaneous and endothermic. The reaction kinetics followed the pseudo-second-order model. Thermally prepared V.sub.2O.sub.5-NPs offer a simple and efficient approach for selective MB removal from an aqueous medium. Graphical abstract
ISSN:2314-8535
DOI:10.1186/s43088-023-00350-3