Impact of adding vanadium pentoxide to Mn-doped magnetite for technological uses

Abstract

Nanocomposites containing different contributions of vanadium oxide (V2O5) and magnetite (Fe3O4) modified with manganese (Mn) ions were fabricated upon the formula of xMn0.4Fe2.6O4/(1-x)V2O5, whereas x = 0.0, 0.2, 0.4, 0.5, 0.6, 0.8, and 1.0. The obtained compositions were characterized upon their structure, morphology, besides their magnetic susceptibility. The TEM micrographs depicted that V2O5 was formed as rod shapes with diameters of 20–30 nm and length of 450 nm, while Mn–magnetite was configured in ellipsoidal shapes with dimensions 25–40 nm. Moreover, the Maximum height of the roughness(Rt) changed from 507.0 to 220.6 nm, while the skewness (Rsk) increased from 0.104 to 0.122 for (x = 0.2, and x = 1.0), respectively. Furthermore, Curie Weiss constant (θ) increased from 830 to 890 K and then decreased to 520 K, for x = 0.2, 0.5, and x = 1.0, respectively. The photo-activated antibacterial activity was examined and showed that the inhibition zone increased significantly by increasing the V2O5 content as well as it increased also from dark to light conditions. It was changed from 17.4 ± 1.1 and 16.9 ± 1.3 mm to 19.2 ± 1.4 and 18.9 ± 1.5 mm for pure V2O5 (x=0.0) against E. coli and S. aureus, respectively. The degradation of methylene blue (MB) was tested, and the efficiency of removal reached around 97.1% for the highest contribution of V2O5 after 35 min of visible light exposure. Hence, the fabricated nanocomposites can be suggested for a deep investigation to be highlighted for disinfection and water treatment applications.

Study the multiferroic properties of BiFeO3/Ni0.1Fe2.9O4 for heavy metal removal

“…As numbers of small polaron between states increased by increasing frequency [21]. Activation energy of prepared sample can be calculated from Arrhenius equation [22]:…”

“…Synthesis of nanocomposites overcomes these drawbacks of BiFeO 3 by combining ferromagnetic and ferroelectric materials [21]. As a result, it is expected that magnetoelectric effect of BFO can be enhanced by adding strong magnetic material as magnetite nanoparticles [Fe 3 O 4 ] doping with Ni which has great magnetic properties [22].…”

Fe3O4-ZnO:V Nanocomposites with Modulable Properties as Magnetic Recoverable Photocatalysts

“…The current photocatalytic system's drawbacks, which restrict its industrial relevance, include its low visible light consumption [12], quick charge recombination [13], and limited photogenerated electron [14] and hole migration capabilities [15]. Adjustments to the band edge, band gap tuning, and crystal structure may all be applied to boost visible light absorption for the photocatalytic process [13,16].…”