Enhanced Visible Light-Driven Photocatalysis by Eu3+-Doping in BaNb2V2O11 with Layered Mixed-Anion Structure

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• 作者：Lin Qin ; Peiqing Cai ; Cuili Chen ; Han Cheng ; Jing Wang ; Sun Il Kim ; Hyo Jin Seo
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 23, 2016
• 年：2016
• 卷：120
• 期：24
• 页码：12989-12998
• 全文大小：783K
• 年卷期：0
• ISSN：1932-7455

文摘

Europium- (Eu-) doped BaNb₂V₂O₁₁ powders with layered mixed-anion structure were prepared through the solid state method successfully. The obtained powders were characterized using X-ray powder diffraction (XRD), structural refinement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet visible (UV–vis) absorption spectra, and photoluminescence (PL) measurements. The experimental results demonstrate that BaNb₂V₂O₁₁ powders could absorb the UV–vis light effectively with the band gap energy of 2.219 eV. The introduction of Eu³⁺ in the host contributes to the decrease of the band gap energy (2.137 eV). Moreover, the photocatalytic activities of the obtained powders were evaluated through the photocatalytic degradation of the methylene blue (MB) solutions under visible light irradiation as a function of time. All the results indicate that the BaNb₂V₂O₁₁ powders can be used as a potential visible-light-driven photocatalyst. Notably, due to the introduction of Eu³⁺, the photocatalytic degradation rate of MB solutions could be improved dramatically. The influence of the existence of Eu³⁺ on the photocatalytic properties is further discussed in detail based on the crystal structure characteristic.