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In this paper, the photocatalytic activity of multiferroics BiFeO3 (BFO) andBi0.8La0.2FeO3 (BLFO) nanocrystals with two different morphologies which weresynthesized by two different sol-gel (SG) and hydrothermal (HT) methods havebeen studied. All the obtained samples were characterized using X-raydiffractometer, Fourier transform infrared spectroscopy, transmission electronmicroscopy, UV-vis spectroscopy and vibrating sample magnetometer. Differentialthermal analysis (DTA) measurements were probed ferroelectric- paraelectricfirst-order phase transition (TC) for all samples. Addition of lanthanumdecreases the electric phase transition. For photocatalyst application ofbismuth ferrite, adsorption potential of nanoparticles for methylene blue (MB)organic dye was evaluated. The doping of La in the BFO structure enhanced thephotocatalytic activity and about 71% degradation of MB dye was obtained undervisible irradiation. The magnetic and ferroelectric properties of BLFOnanoparticles improve compared to the undoped BiFeO3 nanoparticles. Thenon-saturation at high applied magnetic field for as-prepared samples by HT isrelated to the size and shape of products. This work not only presents aneffect of lanthanum substitution into the bismuth ferrite structure on thephysical properties of BFO, but also compares the synthesis method and itsinfluence on the photocatalytic activity and multiferroics properties of allnanopowders.

Photocatalytic activity enhancement by addition of lanthanum into the BiFeO3 structure and the effect of synthesis method