Pradeep Reddy Vanga

Photocatalytic activity of BiFeO3 nanoparticles synthesized through hydrothermal method

Multiferroic BiFeO3 (BFO) nanoparticles (Nps) were synthesized using hydrothermal method. From the X-Ray diffraction analysis (XRD), the synthesized Nps were found to having rhombohedral structure with R3c space group confirmed by Rietveld analysis. Fourier transform infrared spectroscopy (FTIR) analysis was carried out to identify the chemical bonds present in the BFO Nps. Photocatalytic properties of synthesized Nps were studied for the degradation of Methylene Blue (MB) dye under visible light of 150W.

Sol-gel synthesis and characterisation of (Nd, Cr) co-doped BiFeO3 nanoparticles

ABSTRACT Bi0.95Nd0.05Fe1–xCrxO3 (x = 0, 0.01, 0.03, 0.05) samples are synthesised by the sol-gel method. The variation in structure, magnetisation, electrical and photocatalytic properties by Cr doping at Fe site in Bi0.95Nd0.05FeO3 samples is analysed. X-ray diffraction pattern confirms the formation of rhombohedral structure in all the samples. The crystallite size is calculated using the Scherrer relation and found to be in nanometre range. Kubelka-Munk theory is used to determine the direct band gap of the samples from reflectance spectra. The saturation magnetisation is found to enhance the concentration of chromium. Arrott-Belov-Kouvel plot confirms the ferromagnetic nature in the samples. The leakage mechanisms are studied to understand the influence of Cr concentration on the BFO. A good correlation exists between the leakage current and ferroelectric behaviour. Photocatalytic tests show degradation of methylene blue dye in the presence of H2O2. A drastic decrease in photocatalytic activity is observed with the concentration of Cr.

The Effect of a 0.5 T Magnetic Field on the Photocatalytic Activity of Recyclable Nd-modified BiFeO 3 Magnetic Catalysts

Nd-modified BiFeO3 (Bi1-xNdxFeO3, BFO:Nd) nanostructures were synthesized via the hydrothermal method in order to determine their applicability for magnetic-field-assisted photocatalytic degradation of toxic dyes. The structural, optical, and magnetic features of the photocatalysts were investigated by powder X-ray diffraction, high-resolution transmission electron microscopy, ultraviolet-visible diffuse reflectance spectroscopy, and vibrating sample magnetometry. Magnetically induced acceleration of photocatalysis for the degradation of phenol red solutions under visible light illumination were tested in the absence and presence of a 0.5 T magnetic field. Among all the compositions, the highest degradation rate was at x = 0.10 where, in the presence of magnetic field, there was almost full degradation of the dye after 2 hours. The recyclability of the photocatalysts was also tested.

Effect of Cobalt Concentration on Bi0.95Ba0.05Fe1-xCoxO3

In the present work, we have reported the effect of cobalt concentration on Bi0.95Ba0.05Fe1-xCoxO3 (where x = 0.01, 0.03, 0.05) synthesis by solvothermal method. The structural properties are studied using X-ray diffraction by performing Rietveld analysis. The change in magnetic properties is associated with bond angle. The leakage current density mechanism is studied by measuring I-V characteristics.

Magnetic and optical studies of Fe and Co co-doped ZnO

Fe and Co co-doped ZnO nanoparticles were synthesized by hydrothermal method. Limit of substitution was identified using XRD. Magnetic measurements at room temperature for doped samples showed paramagnetic and ferromagnetic in nature. The reflectance spectra exhibited the absorption peaks corresponding to both dopant and host ions. Emission spectra show defect related peaks, suppression of visible spectra peaks is observed in doped samples.