Synthesis, characterization of V2O5 nanoparticles and determination of catalase mimetic activity by new colorimetric method

Abstract

This paper deals with an advanced colorimetric method used to determine the catalase mimetic activity of V2O5 nanoparticles by measuring the decrease in potassium permanganate concentration in a mixture containing V2O5 and hydrogen peroxide. The experiments were carried out in batch reactor at room temperature for 3 min at wavelength number of 525 nm. Vanadium pentoxide was synthesized by hydrothermal method (reflux) from ammonium metavanadate (NH4VO3) as a precursor and cetyltrimethylammonium bromide as a surfactant. The annealing of the product was carried out for 2 h, at temperatures of 250, 500 and 750 °C. In order to determine the structure and the chemical nature of the nanoparticles prepared, the characterization was carried out by X-ray diffraction and scanning electron microscopic techniques. Atomic force microscopic and thermal gravimetric investigations have shown the decomposition steps of V2O5 at different temperatures. UV–visible spectroscopic technique and Fourier transform spectrometry were used to further characterize the nanoparticles. Advanced colorimetric method was used to study the catalase mimetic activity of the newly synthesized vanadium pentoxide (V2O5) nanoparticles using hydrogen peroxide (H2O2) as substrate. V2O5 nanoparticles resulted in an increase in the catalase mimetic activity with increasing the annealing temperature of the V2O5 nanoparticles. The maximum activity was found at 500 °C, which subsequently decreased with further increase in the annealing temperature.

Preparation of V2O5 and SnO2 Nanoparticles and Their Application as Pollutant Removal

“…Therefore, the energy gap of V2O5.nH2O equal to 2.583 eV and that annealing at 500 o C (V2O5) equal to 3.875 eV respectively. These results are agreed with reference [11] which found equal to 2.63 eV and 3.48 eV at temperature 90 o C and 500 o C respectively..…”

“…The mechanism to remove BTB from aqueous solution by the nanoparticles can occur through the interaction between the partially positive charges on the metal in the nanoparticle, with a negative charge in the BTB to form an ionic bond be explained in figure (11). According to these mechanisms, MB can bond with nanoparticles from two sides (sulphur and nitrogen), while BTB can bond with nanoparticles only by one side (phenoxide).…”

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“…The energy gap of prepared V2O5.nH2O is 2.3 eV, while annealing at 400 °C (V2O5) is 3.0 eV. These findings are in agreement with those in [23].…”

V2O5, CeO2 and Their MWCNTs Nanocomposites Modified for the Removal of Kerosene from Water

“…Vanadium pentoxide (V 2 O 5 ) was prepared by hydrothermal methods (reflux) using ammonium metavanadate, ethanol (EtOH), nitric acid, cetyltrimethylammonium bromide (CTAB), and distilled water according to the reported method [34,35]. At first, 0.1 g of NH 4 VO 5 and 0.1 g of CTAB were dissolved in a mixture of distilled water and ethanol (100 mL) in the ratio of 7:3, respectively.…”

“…Then it was dried in an oven at 90 • C for 60 min and annealed at 500 • C for 4 h to obtain the vanadia nanoparticles. Equation (1) describes the chemical reactions used to prepare vanadium pentoxide [34].…”