Preparation and Characterization of Ba0.6K0.4BiO3 Nano Particles with High Visible Light Photo Catalytic Activity

Herein, we report the synthesis of a novel nano-structured photo catalyst Ba0.6K0.4BiO3 by Pechini method. Prepared catalyst is characterized using simultaneous thermogravimetric differential thermal analysis (TG–DTA), ray diffraction (XRD), Scanning electron microscopy (SEM), Ultra VioletDiffuse reflectance spectroscopy (UV-DRS) and Fourier-transform infrared spectroscopy (FT-IR). The XRD pattern suggests that Ba0.6K0.4BiO3 crystallizes in the cubic structure. The formation ofperovskite phase can be confirmed by the presence of metal-oxygen band in the FTIR spectrum. SEM image reveals the nano sized plate like structure of Ba0.6K0.4BiO3 with particle size in the range of 10-45 nm. The band gap is calculated from the DRS and is found to be 1.8eV. The band gap and crystalline nature suggest that this material can be used as a photo catalyst. The photo catalytic activity ofBa0.6K0.4BiO3 is evaluated for degradation of Malachite Green dye under visible light irradiation. The results reveal that 0.75 gL-1 Ba0.6K0.4BiO3 with initial concentration of Malachite Green 40 mgL-1irradiated for 30 minutes shows the highest photo catalytic activity. According to Langmuir- Hinshelwood kinetic model, the photo catalytic degradation of Malachite green dye follows pseudofirst- order kinetics.

کلیدواژه ها:

Ba0.6K0.4BiO3 ، Malachite Green dye ، Pechini Method ، Perovskites ، Photocatalytic degradation ،