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Enhanced Photocatalytic Activity of La3+ and Se4+ co-doped Bismuth Ferrites Nanostructures

Abstract

Photocatalysis is attracting huge interest by addressing current energy and environmental issues by converting solar light into chemical energy. For this purpose, we investigated the effect of La3+ and Se4+ co-doping on photocatalytic activity of BiFeO3. The BiFeO3 and Bi0.92La0.08FeO3 nanoparticles containing different Se4+ doping contents (BiFe(1-x)SexO3, x= 0.0, 0.02, 0.05) and (Bi0.92La0.08Fe(1-x)SexO3, x = 0.0, 0.02, 0.05, 0.075, 0.1), respectively, were synthesized with double solvent sol-gel route. The co-doped nanoparticles were characterized by X-ray diffractometry (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), and UV-vis diffuse reflectance spectroscopy (DRS), and their photocatalytic activity was studied by photocatalytic degradation of Congo red (CR) in aqueous solution under different wavelength of light illumination. The band-gap of the pure BiFeO3 was significantly decreased from 2.06 eV to 1.94 eV. It was found that the La3+ and Se4+ co-doping significantly affected the photocatalytic performance of pure BiFeO3. Moreover, with the increment of Se4+ doping into Bi0.92La0.08FeO3 up to an optimal value, the photocatalytic activity was maximized. In order to study the photosensitization process, photo-degradation of colourless organic compound (acetophenone) was also observed. On the basis of these experimental results, the enhanced photocatalytic activities of La3+ and Se4+ co-doping could be attributed to the increased optical absorption, the efficient separation and migration of photo-generated charge carriers with the decreased recombination of electron-hole resulting from co-doping effect. The possible photocatalytic mechanism of La3+ and Se4+ co-doped BiFeO3 was critically discussed.

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Publication details

The article was received on 28 Feb 2017, accepted on 11 May 2017 and first published on 11 May 2017


Article type: Paper
DOI: 10.1039/C7TA01847A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Enhanced Photocatalytic Activity of La3+ and Se4+ co-doped Bismuth Ferrites Nanostructures

    A. S. Irfan, L. Li, A. Saleemi and C. Nan, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA01847A

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