溶胶-凝胶法制备Eu3+掺杂BiVO4及其可见光光催化性能

doi:10.3724/SP.J.1077.2013.12195

摘要/Abstract

摘要：

采用柠檬酸络合溶胶-凝胶法制备了Eu³⁺掺杂BiVO₄新型光催化剂, 通过XPS、XRD、SEM、BET和UV-Vis等手段对其进行表征和分析。并以甲基橙为模拟污染物, 考察了 BiVO₄的可见光催化活性。结果表明, Eu³⁺掺杂前后BiVO₄均为单斜白钨矿型, 无其他杂质相生成, 且由于掺杂Eu³⁺, 晶体中V⁴⁺和氧空缺增多。掺杂后样品光吸收性能发生红移, 但掺杂对其形貌和比表面积改变较小。Eu³⁺掺杂有效提高了BiVO₄的可见光催化活性, 当Eu³⁺掺杂量为0.2mol%时, BiVO₄光催化效率最高, 50 min内对甲基橙溶液的脱色率达95%, 比纯BiVO₄提高了62%左右。

关键词: 钒酸铋, 光催化剂, Eu³⁺掺杂, 甲基橙

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

中图分类号:

O643

王敏, 刘琼, 孙亚杰, 车寅生, 姜承志. 溶胶-凝胶法制备Eu³⁺掺杂BiVO₄及其可见光光催化性能[J]. 无机材料学报, 2013, 28(2): 153-158.

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.

图/表 6

图1 0.2% Eu-BVO样品Eu4d XPS能谱图

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

图2 BVO和0.2% Eu-BVO样品的Bi4f、V2p 和 O1s 的XPS能谱图

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

图3 不同Eu2+掺杂量BiVO4光催化剂的XRD图谱(500℃煅烧5 h)

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

图4 催化剂样品的SEM照片和EDS图谱

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

图5 不同掺杂比例的BiVO4光催化剂的紫外-可见漫反射光谱图

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

图6 不同Eu3+掺杂量BiVO4 的光催化活性

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

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溶胶-凝胶法制备Eu³⁺掺杂BiVO₄及其可见光光催化性能

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

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