CN-122006735-A - CBO/BVO/BMO heterojunction photocatalyst and preparation method and application thereof

Abstract

The invention relates to the technical field of photocatalysts, in particular to a CBO/BVO/BMO heterojunction photocatalyst and a preparation method and application thereof. The preparation method of the CBO/BVO/BMO heterojunction photocatalyst comprises the steps of uniformly mixing a Bi source, a V source and CuBi 2 O 4 with a solvent, performing hydrothermal reaction to obtain a CuBi 2 O 4 /BiVO 4 composite material, uniformly mixing a Bi source, a Mo source and a CuBi 2 O 4 /BiVO 4 composite material with the solvent, and performing solvothermal reaction to obtain the CBO/BVO/BMO heterojunction photocatalyst. Compared with the monomer catalysts (CuBi 2 O 4 、BiVO 4 and Bi 2 MoO 6 ), the CBO/BVO/BMO heterojunction photocatalyst has the advantages that the conduction band and valence band are changed, the visible light absorption range is widened, the separation efficiency of photon-generated carriers is enhanced, and the photocatalytic degradation effect on tetracycline hydrochloride is good.

Inventors

• WANG MENG
• FU ZHONGHUI
• MENG QINGQIANG
• DENG YIPING
• CHEN XIANGDONG

Assignees

• 东北农业大学

Dates

Publication Date

20260512

Application Date

20260130

Claims (10)

1. 1. The preparation method of the CBO/BVO/BMO heterojunction photocatalyst is characterized by comprising the following steps of: Step 1, uniformly mixing a Bi source, a V source and CuBi 2 O 4 with a solvent, and then carrying out hydrothermal reaction to obtain a CuBi 2 O 4 /BiVO 4 composite material; And 2, uniformly mixing the Bi source, the Mo source and the CuBi 2 O 4 /BiVO 4 composite material with a solvent, and then performing solvothermal reaction to obtain the CBO/BVO/BMO heterojunction photocatalyst.
2. 2. The method for preparing the CBO/BVO/BMO heterojunction photocatalyst according to claim 1, wherein in the step 1, the Bi source is Bi (NO 3 ) 3 ·5H 2 O; the V source is NH 4 VO 3 ; the mole ratio of the Bi source to the V source is 1:1, and the solvent is a mixture of ethylene glycol and water in a volume ratio of 1:2-2:1.
3. 3. The method for preparing the CBO/BVO/BMO heterojunction photocatalyst according to claim 1, wherein in the step 1, the hydrothermal reaction is carried out at a temperature of 150-180 ℃ for a time of 10-16 h.
4. 4. The preparation method of the CBO/BVO/BMO heterojunction photocatalyst according to claim 1, wherein the mass percentage of CuBi 2 O 4 in the CuBi 2 O 4 /BiVO 4 composite material is 3% -13%.
5. 5. The method for preparing the CBO/BVO/BMO heterojunction photocatalyst according to claim 1, wherein in the step 2, the Bi source is Bi (NO 3 ) 3 ·5H 2 O; the Mo source is Na 2 MoO 4 , and the molar ratio of the Bi source to the Mo source is 2:1.
6. 6. The method for preparing the CBO/BVO/BMO heterojunction photocatalyst according to claim 1, wherein in the step 2, the solvent is a mixture of ethylene glycol and ethanol in a volume ratio of 1:2-2:1.
7. 7. The method for preparing the CBO/BVO/BMO heterojunction photocatalyst according to claim 1, wherein in the step 2, the solvothermal reaction is carried out at a temperature of 150-180 ℃ for a time of 10-16 h.
8. 8. The preparation method of the CBO/BVO/BMO heterojunction photocatalyst according to claim 1, wherein the mass percentage of the CuBi 2 O 4 /BiVO 4 composite material in the CBO/BVO/BMO heterojunction photocatalyst is 10% -30%.
9. 9. A CBO/BVO/BMO heterojunction photocatalyst prepared by the preparation method according to any one of claims 1 to 8.
10. 10. The use of the CBO/BVO/BMO heterojunction photocatalyst of claim 9, in the degradation of a contaminant by a photocatalyst, wherein the contaminant is tetracycline hydrochloride.

Description

CBO/BVO/BMO heterojunction photocatalyst and preparation method and application thereof Technical Field The invention relates to the technical field of photocatalysts, in particular to a CBO/BVO/BMO heterojunction photocatalyst and a preparation method and application thereof. Background Tetracycline hydrochloride (TC) is a widely used antibiotic, and its residue in an aqueous environment may not only lead to the transmission of resistance genes, but may also have adverse effects on the ecosystem. Photocatalytic technology is an advanced oxidation technology that can utilize strong oxidative radicals generated by photo-generated carriers, such as hydroxyl radicals (OH) and superoxide radicals (O 2-), to degrade organic contaminants. In the process of photocatalytic degradation of tetracycline hydrochloride, the photocatalyst generates electron-hole pairs by absorbing light energy, and the carriers can undergo oxidation-reduction reaction with tetracycline hydrochloride molecules adsorbed on the surface of the catalyst, so that the degradation of the tetracycline hydrochloride molecules is realized. In the research of photocatalytic degradation of tetracycline hydrochloride, the development of a high-performance photocatalyst is a key for improving degradation efficiency. At present, single metal oxide photocatalysts are widely studied, but have obvious limitations that on one hand, the visible light absorption range of the single photocatalysts is narrow, the solar energy utilization rate is low, and on the other hand, the photo-generated electrons and holes are very easy to be combined, so that the carrier separation efficiency is low, and further the improvement of the photocatalytic activity is limited. In addition, the chemical stability of part of single photocatalyst is poor, the recycling performance is poor, and the practical application requirement is difficult to meet. To overcome the defects of a single photocatalyst, the construction of heterojunction photocatalysts has become a research hotspot in recent years. By compounding two or more semiconductor materials to form a heterojunction, the energy band structure of the photocatalyst can be optimized, the visible light absorption range is widened, meanwhile, a built-in electric field is constructed by utilizing the energy level difference between semiconductors, and the separation and migration of photo-generated carriers are promoted, so that the photocatalytic performance is remarkably improved. However, when the existing heterojunction photocatalyst (such as a binary heterojunction) is used for degrading tetracycline hydrochloride, the problems of insufficient carrier separation efficiency, limited active species generation amount, poor adaptability to complex water environment and the like still exist, and the degradation efficiency and stability of the existing heterojunction photocatalyst still have a large improvement space. Therefore, a novel heterojunction photocatalyst with a wide visible light response range, high carrier separation efficiency, excellent degradation activity and stability is developed, is used for efficiently degrading tetracycline hydrochloride in water environment, and has important practical significance and application value for solving the problem of antibiotic pollution and protecting ecological environment. Disclosure of Invention Based on the above, the invention provides a CBO/BVO/BMO heterojunction photocatalyst, a preparation method and application thereof, and provides a new technical scheme for efficiently removing tetracycline hydrochloride in water environment. In order to achieve the above object, the present invention provides the following solutions: According to one of the technical schemes, the preparation method of the CBO/BVO/BMO heterojunction photocatalyst comprises the following steps: Step 1, uniformly mixing a Bi source, a V source and CuBi 2O4 with a solvent, and then carrying out hydrothermal reaction to obtain a CuBi 2O4/BiVO4 composite material; And 2, uniformly mixing the Bi source, the Mo source and the CuBi 2O4/BiVO4 composite material with a solvent, and then performing solvothermal reaction to obtain the CBO/BVO/BMO heterojunction photocatalyst. In a preferred embodiment of the present invention, in step 1, the Bi source is Bi (NO 3)3·5H2 O; the V source is NH 4VO3; the molar ratio of the Bi source to the V source is 1:1, and the solvent is a mixture of ethylene glycol and water in a volume ratio of 1:2-2:1. In the step 1, a mixture of ethylene glycol and water in a volume ratio of 1:2-2:1 is used as a solvent, so that the high viscosity of the ethylene glycol is utilized to slow down the nucleation and growth speed of the BiVO 4, and a monoclinic scheelite phase BiVO 4 with uniform particle size and high crystallinity is formed. The ratio of glycol to water is lower than the ratio, the viscosity of the solvent is lower, the crystal growth rate is faster, and the uniformity of the p