Abstract
The BiNbO4 powders were prepared by a solid-state reaction method at 900 and 1300°C, and respectively characterized by X-ray powder diffraction and ultraviolet-visible diffuse reflection. It was found that BiNbO4 undergo an irreversible orthorhombic-triclinic phase transition, the powder calcined at 900°C is orthorhombic phase while the powder calcined at 1300°C is triclinic phase. The band gap of the orthorhombic phase (3.4 eV) is broader than that of the triclinic phase (3.0 eV). The photocatalytic activities of BiNbO4 were systematically investigated on the degradation of methyl orange. The orthorhombic phase shows higher photocatalytic activity than the triclinic one. The dosage of the photocatalysts and the pH value in the solution greatly influenced the degradation rate. The electronic structures of both phases were studies by the first-principal calculations.
Original language | English |
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Pages (from-to) | 565-568+572 |
Journal | Gongneng Cailiao/Journal of Functional Materials |
Volume | 38 |
Issue number | 4 |
State | Published - Apr 2007 |
Keywords
- Band structure
- BiNbO
- Methyl orange
- Photocatalytic