Photocatalytic Property of Eu/BiVO4 Photocatalyst by Citric Acid Sol-Gel Method

doi:10.3724/SP.J.1077.2013.12195

Abstract

Abstract:

Eu³⁺-doped BiVO₄ photocatalyst was synthesized by complexing Sol-Gel method using citric acid as chelate, and characterized with X-ray photoelectron spectroscope(XPS), X-ray diffraction(XRD), scanning electron microscope(SEM), specific surface area (BET) and UV-Vis diffuse reflectance spectroscope(DRS). The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange (MO) solution under visible light. It revealed that pure BiVO₄and all the Eu³⁺ dopedsamples were monoclinic phase and no peaks of any other phases or impurities were detected. It was also found that doping Eu³⁺ increased the amount of V⁴⁺ and oxygen vacancies. In addition, the light absorption edges of Eu³⁺ doped BiVO₄ had extended a red shift compared with that of pure BiVO₄. However, Eu³⁺ doping had little influence on morphology and specific surface area. The appropriate amount of Eu³⁺ doping could signifcantly increase the photocatalytic activity and the highest photocatalytic degradation rate was about 95% when the Eu³⁺ doping amount was 0.2%, which was more 62% than that of pure BiVO₄ under 50 min visible light irridation.

Key words: BiVO₄, photocatalyst, Eu³⁺ doped, methyl orange solution

CLC Number:

O643

WANG Min, LIU Qiong, SUN Ya-Jie, CHE Yin-Sheng, JIANG Chen-Zhi. Photocatalytic Property of Eu/BiVO₄ Photocatalyst by Citric Acid Sol-Gel Method[J]. Journal of Inorganic Materials, 2013, 28(2): 153-158.

Figures/Tables 6

Fig. 1 Eu4d XPS spectra of 0.2% Eu-BVO sample

Fig. 2 Bi4f (a), V2p (b,b’), and O1s (c,c’) XPS spectra of BVO and 0.2% Eu-BVO samples

Fig. 3 XRD patterns of BiVO4 photocatalysts doped with different Eu2+ (calcined at 500℃ for 5 h)

Fig. 4 SEM images of BVO (a, b); 0.2% Eu-BVO (c, d, e) and EDS spectrum of 0.2% Eu-BVO (f)

Fig. 5 UV-Vis diffuses reflectance spectra of different contents of BiVO4 catalysts

Fig. 6 Photocatalytic activity of Eu3+-doped BiVO4 with different amounts of Eu3+

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Photocatalytic Property of Eu/BiVO₄ Photocatalyst by Citric Acid Sol-Gel Method

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