Synthesis and properties of Tb modified BiVO<sub>4</sub>/BiOCl composite photocatalysts

Liu Jingjing; Zhang Zelan; Zhao Wei

doi:10.7513/j.issn.1004-7638.2021.04.007

Volume 42 Issue 4

Aug. 2021

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Liu Jingjing, Zhang Zelan, Zhao Wei. Synthesis and properties of Tb modified BiVO4/BiOCl composite photocatalysts[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 39-46. doi: 10.7513/j.issn.1004-7638.2021.04.007

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Liu Jingjing, Zhang Zelan, Zhao Wei. Synthesis and properties of Tb modified BiVO₄/BiOCl composite photocatalysts[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 39-46. doi: 10.7513/j.issn.1004-7638.2021.04.007

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Synthesis and properties of Tb modified BiVO₄/BiOCl composite photocatalysts

doi: 10.7513/j.issn.1004-7638.2021.04.007

College of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, Sichuan, China

Received Date: 2021-06-04
Publish Date: 2021-08-10

Abstract

Abstract

BiVO₄/BiOCl composite photocatalysts with different contents of Tb were prepared by liquid phase precipitation method, and the catalysts were characterized by XRD and EDS. The photocatalytic performance of the photocatalysts was evaluated by degradation of rhodamine B under irradiation of the simulated sunlight. The effects of Tb content, photocatalytic time, catalyst dosage, rhodamine B concentration on the photodegradation efficiency of the samples were studied by single factor experiments, and the optimal scheme was determined by orthogonal tests. The results show that the pure BiVO₄ belongs to monoclinic phase, and the samples with Tb content of 2% and 4% are mixture of monoclinic BiVO₄/BiOCl phases. The samples with Tb content of 6%～12% are mixture of monoclinic BiVO₄/tetragonal BiVO₄/BiOCl phases. It indicates that the introduction of Tb can promote the transformation of BiVO₄ from monoclinic phase to tetragonal phase. Compared with that of the pure BiVO₄, the photodegradation efficiency of all samples containing Tb is improved greatly, and the optimal molar fraction of Tb is 10%. At the rhodamine B concentration of 5 mg/L, the catalyst dosage of 25 mg, and the photocatalytic time of 2 h, the photodegradation efficiency of the sample with 10% Tb can reach 100%. The improved photocatalytic performance may be attributed to the electron capture effect of Tb and the formation of monoclinic BiVO₄/tetragonal BiVO₄/BiOCl miscible p-n heterostructures, which effectively improve the separation and transmission of photoinduced carriers and suppress the recombination of electron-hole pairs. It has great potential and application value in the treatment of polluted wastewater.
- BiVO₄,
- Tb,
- photocatalytic,
- degradation,
- liquid phase precipitation

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References(34)

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