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Issue 9, 2018
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Phase-controlled synthesis of bismuth oxide polymorphs for photocatalytic applications

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Abstract

In this study, bismuth oxide polymorphs (α and β phases) were synthesized using a post-calcination method using Bi2O2CO3 nanoflakes as an intermediate. These samples were characterized by various spectroscopic techniques such as powder X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, UV-visible absorption, photoluminescence studies and microscopic analysis (scanning and transmission electron microscopy). The mechanism of the formation of β-Bi2O3 nanoparticles and the α-Bi2O3 coral-like morphology has been proposed. Furthermore, the photocatalytic performance of the bismuth oxide polymorphs was investigated via the degradation of organic dyes (rhodamine B, methylene blue, acid orange 7 and methyl orange) under simulated solar illumination. The results show that the β-Bi2O3 nanoparticles possess superior photocatalytic activity compared to the α-Bi2O3 coral-like morphology for the degradation of these dyes due to a higher photon adsorption (band gap of 2.2 eV for β-Bi2O3 and 2.56 eV for α-Bi2O3). However, the photocatalytic activity of these bismuth oxide polymorphs for the degradation of organic dyes followed the order of Rh B > AO 7 > MB > MO under identical experimental conditions. A plausible mechanism has been proposed for the photocatalytic activity.

Graphical abstract: Phase-controlled synthesis of bismuth oxide polymorphs for photocatalytic applications

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Publication details

The article was received on 09 May 2018, accepted on 29 Jun 2018 and first published on 09 Jul 2018


Article type: Research Article
DOI: 10.1039/C8QM00221E
Citation: Mater. Chem. Front., 2018,2, 1664-1673
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    Phase-controlled synthesis of bismuth oxide polymorphs for photocatalytic applications

    T. Selvamani, S. Anandan, L. Granone, D. W. Bahnemann and M. Ashokkumar, Mater. Chem. Front., 2018, 2, 1664
    DOI: 10.1039/C8QM00221E

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