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A conjugated composite of α-Fe2O3 and BiOBr with enhanced visible-light-induced photocatalytic activity.
- Source :
-
Journal of Molecular Catalysis A: Chemistry . Sep2016, Vol. 421, p16-28. 13p. - Publication Year :
- 2016
-
Abstract
- Owing to its nontoxic property, low cost and narrow band gap, alpha-iron(III) oxide (α-Fe 2 O 3 ) is a promising material as photocatalyst. However, it has shortcomings such as quick recombination and a short lifetime of the electron-hole pairs, which directly reduce the photocatalytic efficiency of α-Fe 2 O 3 and hinder its wide applications. In this study, a facile hydrothermal method was used to incorporate BiOBr with α-Fe 2 O 3 in an attempt to overcome the previously mentioned limitations of α-Fe 2 O 3 , and the synthesized composites were fully characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV–vis diffuse-reflection spectroscopy (DRS). The BiOBr/α-Fe 2 O 3 composite showed much higher visible-light-driven photocatalytic activity than the pure α-Fe 2 O 3 and BiOBr for Rhodamine B (RhB) degradation. Specifically, the composite synthesized at 100 °C for 18 h with a mass ratio of BiOBr to α-Fe 2 O 3 5:10 performed the best. This work also explored the chemical mechanism and pathway of RhB degradation, and the roles of the oxidative species with the presence of BiOBr/α-Fe 2 O 3 composites in the photocatalytic oxidation process, including holes (h + ), hydroxyl radicals ( OH), and superoxide radicals ( O 2 − ). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13811169
- Volume :
- 421
- Database :
- Academic Search Index
- Journal :
- Journal of Molecular Catalysis A: Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 116404848
- Full Text :
- https://doi.org/10.1016/j.molcata.2016.05.004