Preparation method of visible light-responsive Fe3O4 quantum dot-modified BiOCl/BiVO4

A technology of visible light and quantum dots, applied in chemical instruments and methods, light water/sewage treatment, chemical/physical processes, etc., can solve the problem of low utilization rate of sunlight, achieve low cost, excellent photocatalytic activity, and facilitate batch production The effect of production

Inactive Publication Date: 2019-02-15
HOHAI UNIV
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] However, like the photocatalyst titanium dioxide, BiOCl only responds to the ultraviolet region and has a low utilization rate of sunlight.

Method used

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  • Preparation method of visible light-responsive Fe3O4 quantum dot-modified BiOCl/BiVO4
  • Preparation method of visible light-responsive Fe3O4 quantum dot-modified BiOCl/BiVO4
  • Preparation method of visible light-responsive Fe3O4 quantum dot-modified BiOCl/BiVO4

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preparation example Construction

[0029] Visible light-responsive Fe 3 o 4 Quantum dot modified BiOCl / BiVO 4 A preparation method comprising the steps of:

[0030] 1) Preparation of BiOCl / BiVO by one-step hydrothermal method 4 catalyst of light

[0031] BiCl 3 and NH 4 VO 4 Mix in deionized water, add ethanolamine solution after stirring, transfer to a hydrothermal kettle for hydrothermal reaction; the reacted powder is washed, centrifuged, and dried to obtain BiOCl / BiVO 4 catalyst of light;

[0032] 2) Preparation of visible light-responsive Fe 3 o 4 Quantum dot modified BiOCl / BiVO 4

[0033] FeCl 3 ·6H 2 O and the BiOCl / BiVO prepared in step 1) 4 Photocatalysts were mixed and added to deionized water, and stirred to form solution A; meanwhile, the same molar mass of FeCl 2 4H 2 O is dispersed in deionized water, stirred to form solution B, drop B solution into A solution; and continue to add concentrated ammonia water to A solution while stirring; finally, the solid powder is collected by a m...

Embodiment 1

[0041] Embodiment 1: Synthesis of BiOCl / BiVO by one-step hydrothermal method 4 p-n heterojunction.

[0042] Take 0.3153g of BiCl 3 Dissolve in 50ml of water to form solution A, and stir for 30min under magnetic stirring. Another 0.17 g of NH 4 VO 4 Dissolve in 30ml (50°C) deionized water to form solution B, add solution B dropwise to solution A (with constant stirring at room temperature) at a rate of 10mL / min, and quickly add 1.5mL (1mol / L) ethanolamine, adjust the pH to 6.5-7.5. Then transfer to a hydrothermal kettle for hydrothermal reaction, and react at 160°C for 10h. The reacted powder was washed three times with water and ethanol respectively, centrifuged at 100rpm for 5min, and dried in a blast drying oven at 60°C for 12h to obtain BiOCl / BiVO 4 p-n heterojunction.

Embodiment 2

[0043] Embodiment 2: wet chemical method synthesis Fe 3 o 4 QDs-BiOCl / BiVO 4 p-n heterojunction.

[0044] First take 0.2315g BiOCl / BiVO 4 The p-n heterojunction was dispersed in 20mL deionized water, ultrasonically dispersed for 30min, and then FeCl was added at molar ratios of 3:10, 1:5, 1:10, and 1:20, respectively. 3 ·6H 2 O, BiOCl / BiVO 4 p-n heterojunction and FeCl 3 ·6H 2 The O mixed solution was sonicated for 10-20min, then transferred to a 75-85°C water bath, and kept stirring for 25-35min to form solution C. At the same time, FeCl 2 4H 2 O was dissolved in deionized water for 10 min, and solution D was formed after stirring, and solution D was quickly transferred to solution C. And under continuous stirring, 2mL of concentrated ammonia water was quickly added, and then continued to stir in a water bath at 80°C for 30min. Finally, the solid powder is collected by a magnet, washed three times with water and ethanol, and dried in a blast drying oven at 60°C for...

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Abstract

The invention discloses a preparation method of visible light-responsive Fe3O4 quantum dot-modified BiOCl/BiVO4 and belongs to the technical field of preparation of semiconductor materials. The preparation method comprises the following steps: 1) preparation of a BiOCl/BiVO4 photo-catalyst with a one-step hydrothermal method; 2) preparation of the visible light-responsive Fe3O4 quantum dot-modified BiOCl/BiVO4: mixing FeCl3.6H2O and the BiOCl/BiVO4 photo-catalyst prepared in the step 1), adding into deionized water, stirring to form a solution A; meanwhile, dispersing FeCl2.4H2O of the same molar mass in deionized water, stirring to form a solution B, and dropwise adding the solution B in the solution A; continuously adding concentrated ammonia water in the solution A while stirring for areaction; collecting through a magnet, washing and then drying to obtain the visible light-responsive Fe3O4 quantum dot-modified BiOCl/BiVO4. The preparation method disclosed by the invention has thebenefits that a Fe3O4QDs-BiOCl/BiVO4p-n heterojunction is prepared by utilizing the simple and quick method, the heterojunction shows excellent photo-catalytic activity when used for degrading a variety of antibiotics under visible light, and a sample has relatively strong magnetism and is easy to recover and reuse; meanwhile, the preparation method reduces the energy consumption and the reactioncost, is convenient for mass production, non-toxic and harmless, and environmentally-friendly.

Description

technical field [0001] The invention belongs to the technical field of semiconductor material preparation, in particular to visible light-responsive Fe 3 o 4 Quantum dot modified BiOCl / BiVO 4 method of preparation. Background technique [0002] Photocatalytic technology can directly convert solar energy into chemical energy and electrical energy through semiconductor photocatalytic materials, and can achieve complete mineralization and degradation of toxic and harmful organic pollutants in the environment. It is considered to be the most potential solution to the energy and environmental problems of human society. One of the technical solutions. We know that in the solar spectrum, ultraviolet light only accounts for 5%, while the proportion of visible light is as high as 45-50%. Therefore, the development of practically applicable visible light-responsive semiconductor photocatalysts is a hot issue in the field of photocatalysis research. [0003] In recent years, vario...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/128C02F1/30C02F101/30
CPCB01J23/002B01J27/128B01J35/0033B01J35/004C02F1/30C02F2101/308C02F2305/10
Inventor 陆光华江润仁杨皓涵包旭辉章夏冬
Owner HOHAI UNIV
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