Structural control of V2O5 nanoparticles via a thermal decomposition method for prospective photocatalytic applications

Abstract

Background Recently, transition-metal oxides have represented an exciting research topic, especially their fundamental and technological aspects. Here, vanadium pentoxide nanoparticles (V2O5-NPs) were synthesized through the thermal decomposition of ammonium meta-vanadate. In the current study, we investigated the photocatalytic activity of V2O5-NPs to develop and regulate the V2O5 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 V2O5-NPs that correlates with indirect optical transitions. The photocatalytic activity of the V2O5-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 V2O5-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 V2O5-NPs offer a simple and efficient approach for selective MB removal from an aqueous medium. Graphical abstract

Controlled synthesis of MWCNTs/V2O5 nanocomposite by hydrothermal approach for adsorption and photodegradation processes

“…The photogenerated electrons react with oxygen and generate superoxide anions, which can oxidize the dye molecules (Eq.7.8) . Alternatively, the holes on the surface of V2O5 create hydroxyl radical, which could also mineralize the dye molecules (Eq.9.10) [22,30,37]. This result suggests that the nanocomposite improved degradation efficiency significantly agrees with previous studies [38,39].…”

“…To unveil the reaction mechanism between adsorbate and adsorbent, the temporary action of the dye adsorption process was studied by the pseudo-first-order and pseudo-second-order models, as described below [22]. The pseudo-first-order rate expression is obtained by [23]:…”

Recent advances in solar photovoltaic materials and systems for energy storage applications: a review

“…The life cycle analysis revealed that PV systems cannot be considered zero-emission technology due to the potential environmental effects imposed by land use, air quality, water use, the inclusion of hazardous materials, and possible noise/visual pollution; however, these effects can be mitigated by novel technologies such as hybrid power systems and/or floating PV systems [98][99][100]. Overall, future materials for solar photovoltaic devices must balance efficiency, cost, durability, toxicity, availability, and integration to provide a sustainable and cost-effective source of renewable energy [100][101][102][103][104][105][106][107][108].…”

Construction of novel potentiometric sensors modified with biogenically synthesized metal oxide nanoparticles for sensitive detection of the opioid agonist-antagonist nalbuphine hydrochloride in its injection

“…In recent years, nanobiotechnology has become a fundamental branch of current science and a new era in the field of materials science, attracting worldwide interest due to its numerous applications [ 1 ]. The conventional techniques for producing nanoparticles include thermal decomposition [ 2 ], microwave synthesis [ 3 ], electrochemical synthesis [ 4 ], ultraviolet irradiation [ 5 ], laser ablation [ 6 ], laser irradiation [ 7 ], and chemical reduction method [ 8 ]. The fabrication of progressive and clean nanomaterials using several conventional probs, on the other hand, has numerous limitations, such as the use of harmful organic reagents and solvents, the need to elevate the pressure and temperature, and the release of toxic and detrimental byproducts, all of which cause environmental issues [ [9] , [10] , [11] ].…”