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2016 | OriginalPaper | Buchkapitel

23. Formation of BiOCl/Bi₂O₃ and Related Materials for Efficient Visible-Light Photocatalysis

verfasst von : Sandipan Bera, Wan In Lee

Erschienen in: Nanostructured Photocatalysts

Verlag: Springer International Publishing

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Abstract

Novel heterojunction structures of BiOCl/Bi₂O₃ exhibit remarkable photocatalytic activities in decomposing organic compounds in gas or aqueous phase under visible-light irradiation, even though individual BiOCl and Bi₂O₃ show negligible catalytic efficiency. In this BiOCl/Bi₂O₃ system, the BiOCl with a band gap of 3.7 eV works as a main photocatalyst, while the Bi₂O₃ with a band gap of 2.6 eV plays a role as a sensitizer absorbing visible light. It is deduced that its photocatalytic activity is caused by the inter-semiconductor hole transfer between the valence band (VB) of Bi₂O₃ and BiOCl. Moreover, visible-light photocatalytic efficiency of BiOCl/Bi₂O₃ nanocomposite can be further enhanced by covering their surfaces with molecular WO₃ species. It is found that monolayer coverage of WO₃ maximizes the photocatalytic activity of WO₃/BiOCl/Bi₂O₃ system, whereas further increase of WO₃ concentration sharply decreases its activity, suggesting that the role of molecular WO₃ on the surface of BiOCl/Bi₂O₃ is to improve the adsorption of organic species as well as OH⁻ or H₂O. Furthermore, the surface coverage of WO₃ protects BiOCl/Bi₂O₃ system, thus notably extending its chemical- and photostability during photocatalytic reactions. BiOCl/Bi₃O₄Cl nanocomposites also exhibit considerable visible light photocatalytic efficiency. Herein the Bi₃O₄Cl plays a role as a sensitizer absorbing visible-light, and the significant visible-light photocatalytic activity of the BiOCl/Bi₃O₄Cl system originates from the hole (h⁺) transfer between the VB of Bi₃O₄Cl and BiOCl.

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Titel: Formation of BiOCl/Bi2O3 and Related Materials for Efficient Visible-Light Photocatalysis
verfasst von: Sandipan Bera
Wan In Lee
Verlag: Springer International Publishing
Buch: Nanostructured Photocatalysts
Print ISBN: 978-3-319-26077-8

Electronic ISBN: 978-3-319-26079-2

Copyright-Jahr: 2016
DOI: https://doi.org/10.1007/978-3-319-26079-2_23

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