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Issue 30, 2015
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Synthesis of bismuth oxyiodides and their composites: characterization, photocatalytic activity, and degradation mechanisms

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Abstract

Bismuth oxyiodides have been prepared using controlled hydrothermal methods. The products are characterized by SEM-EDS, XRD, XPS, FTIR, PL, EPR, and DRS. It is illustrated that BiOI, Bi4O5I2, Bi7O9I3, Bi5O7I, and BiOxIy/BiOpIq composites can be selectively synthesized through a facile solution-based hydrothermal method. UV-Vis spectra display the bismuth oxyiodide materials as indirect semiconductors with an optical bandgap of 1.86–3.316 eV. The photocatalytic efficiency of the powder suspension is evaluated by measuring the Crystal Violet (CV) concentration. This is the first study to demonstrate the superior activities of BiOI, Bi4O5I2, Bi7O9I3, Bi5O7I, and BiOxIy/BiOpIq composites as promising visible-light-responsive photocatalysts. The quenching effects of various scavengers and EPR indicate that the reactive O2˙ plays a major role and ˙OH and h+ play a minor role. The Bi7O9I3/Bi5O7I composite shows the highest photocatalytic activity reaching a maximum rate constant of 0.2225 h−1, which is 6 times higher than that of BiOI and Bi7O9I3 and 4 times higher than that of Bi5O7I.

Graphical abstract: Synthesis of bismuth oxyiodides and their composites: characterization, photocatalytic activity, and degradation mechanisms

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Publication details

The article was received on 29 Nov 2014, accepted on 23 Feb 2015 and first published on 24 Feb 2015


Article type: Paper
DOI: 10.1039/C4RA15072D
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RSC Adv., 2015,5, 23450-23463

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    Synthesis of bismuth oxyiodides and their composites: characterization, photocatalytic activity, and degradation mechanisms

    W. W. Lee, C. Lu, C. Chuang, Y. Chen, J. Fu, C. Siao and C. Chen, RSC Adv., 2015, 5, 23450
    DOI: 10.1039/C4RA15072D

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