Bismuth oxyiodide heterojunctions in photocatalytic degradation of phenolic molecules

Bismuth oxyiodide heterojunctions in photocatalytic degradation of phenolic molecules Bismuth oxyiodide composites were synthesized and tested as photocatalysts under visible light irradiation. Calcination of bismuth oxyiodide, BiOI, at 420 °C for various lengths of time led to composites with varying compositions of Bi7O9I3 and α-Bi5O7I. The ease of forming iodide-poor bismuth oxyhalides can be attributed to ready loss of the strongly reducing iodide ion. Thermogravimetric measurements show that BiOI is not thermally stable above 350 °C. The Bi7O9I3/α-Bi5O7I composites formed active visible-light photocatalysts for the degradation of phenol, p-chlorophenol, p-cresol, and 4-tert-butylphenol. Compared to BiOI, the rate constant for the photodegradation of phenol was 5–6 times higher over the Bi7O9I3/α-Bi5O7I composites. The excellent activity can be attributed to the efficient separation of photogenerated charge carriers at the intimately contacted heterojunctions of the in situ-generated composites. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Bismuth oxyiodide heterojunctions in photocatalytic degradation of phenolic molecules

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Publisher
Springer Netherlands
Copyright
Copyright © 2015 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-015-1976-7
Publisher site
See Article on Publisher Site

Abstract

Bismuth oxyiodide composites were synthesized and tested as photocatalysts under visible light irradiation. Calcination of bismuth oxyiodide, BiOI, at 420 °C for various lengths of time led to composites with varying compositions of Bi7O9I3 and α-Bi5O7I. The ease of forming iodide-poor bismuth oxyhalides can be attributed to ready loss of the strongly reducing iodide ion. Thermogravimetric measurements show that BiOI is not thermally stable above 350 °C. The Bi7O9I3/α-Bi5O7I composites formed active visible-light photocatalysts for the degradation of phenol, p-chlorophenol, p-cresol, and 4-tert-butylphenol. Compared to BiOI, the rate constant for the photodegradation of phenol was 5–6 times higher over the Bi7O9I3/α-Bi5O7I composites. The excellent activity can be attributed to the efficient separation of photogenerated charge carriers at the intimately contacted heterojunctions of the in situ-generated composites.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Apr 1, 2015

References

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