Preparation method of Ag3PO4/BiVO4 heterojunction composite photocatalyst

A composite light and catalyst technology, applied in the field of photocatalysis, can solve the problems of easy photocorrosion and decomposition into silver, poor chemical stability, and high consumption of precious metal element silver, etc., achieve good photocatalytic activity, improve catalytic activity, and benefit large-scale The effect of large-scale industrial production

Inactive Publication Date: 2015-01-21
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, due to its own poor chemical stability, it is easy to decompose into simple silver by light corrosion during the application process, and at the same time, it needs to consume a large amount of precious metal element silver during the preparation process, thus limiting its practical application. Therefore, a simple and effective A method to reduce the amount of noble metal element silver in the process of photocatalytic reaction and improve the Ag 3 PO 4 The chemical stability of the current Ag 3 PO 4 Research hotspots of photocatalytic system

Method used

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  • Preparation method of Ag3PO4/BiVO4 heterojunction composite photocatalyst
  • Preparation method of Ag3PO4/BiVO4 heterojunction composite photocatalyst
  • Preparation method of Ag3PO4/BiVO4 heterojunction composite photocatalyst

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Embodiment 1

[0033] BiVO 4 Preparation of photocatalyst

[0034] (1) Weigh 4.85g bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) under magnetic stirring, be dissolved in the mixed solution that the volume ratio of 30ml ethylene glycol and water is 1: 1, add the HNO that 3ml wt% is 67 3 Solution, magnetic stirring 30min, the gained solution is marked as A; Take by weighing 1.17g ammonium metavanadate (NH 4 VO 3 ), dissolved in 30ml of a mixed solution with a volume ratio of 1:1 to water, added 2.1ml of ethylenediamine solution, and magnetically stirred for 30min, and the resulting solution was marked as B.

[0035] (2) Slowly add solution B to solution A, stir magnetically for 30 minutes, transfer it to a 100ml hydrothermal reaction kettle, perform hydrothermal reaction at 160°C for 16 hours, cool to room temperature naturally, vacuum filter the product, and use deionized water and Rinse each with absolute ethanol three times, bake at 70°C for 8 hours, calcined at 400°C for 2 hours, ...

Embodiment 2

[0038] Ag 3 PO 4 with BiVO 4 Ag3PO with a molar ratio of 1:5 4 / BiVO 4 Preparation of Composite Photocatalyst

[0039] (1) Weigh 2 mmol of BiVO prepared above 4 Powder, added to 50ml of deionized water, ultrasonically dispersed for 20min, added 1.2mmol of silver nitrate (AgNO 3 ), and magnetically stirred for 30 min.

[0040] (2) Weigh 0.4mmol disodium hydrogen phosphate dodecahydrate (Na 2 HPO 4 12H 2 O) Dissolve in 50ml deionized water, stir to dissolve.

[0041] (3) Na 2 HPO 4 12H 2 The O solution was added dropwise to the above (1) solution, stirred magnetically for 5 h under the condition of avoiding light, the product was vacuum filtered, washed with deionized water and ethanol three times each, and baked at 70° C. for 8 h.

[0042] Ag prepared by this method 3 PO 4 / BiVO 4 Composite photocatalyst, where Ag 3 PO 4 with BiVO 4 The molar ratio is 1:5, by figure 1 It can be seen that for Ag 3 PO 4 / BiVO 4 Composite photocatalyst, Ag appeared near 2θ=3...

Embodiment 3

[0044] Ag 3 PO 4 / BiVO 4 Catalytic Activity Experiment of Composite Photocatalyst

[0045] Weigh 0.1 g of photocatalyst and add it into 100 ml (10 mg / L) Rhodamine B (RhB) solution, and stir for 45 min in the dark, so that the dye reaches adsorption equilibrium on the surface of the catalyst. Use 300W xenon lamp as the light source for photocatalytic reaction (add 400nm filter to remove ultraviolet light). Under the condition of magnetic stirring, 4ml of the reaction solution was taken every 5min, filtered with a disposable syringe filter, and the supernatant was taken to measure the absorbance of the solution with a UV-visible spectrophotometer to detect the change of the solution concentration.

[0046] Depend on image 3 It can be seen that whether pure BiVO 4 、Ag 3 PO 4 Or the composite photocatalysts of the two have strong absorption (>380nm) in the visible light region, indicating that they all have visible light catalytic activity. Have Figure 4 It can be seen ...

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Abstract

The invention relates to a preparation method of an Ag3PO4/BiVO4 heterojunction composite photocatalyst, and belongs to the technical filed of photocatalysis in environment treatment. The Ag3PO4/BiVO4 heterojunction composite photocatalyst is prepared through the steps of preparing BiVO4 and preparing an Ag3PO4/BiVO4 composite photocatalyst. Compared with Ag3PO4/BiVO4 heterojunction composite photocatalysts in the prior art, the product prepared in the invention has the advantages of combination of the stability of the BiVO4 photocatalyst with the high activity of Ag3PO4, maintenance of high visible photocatalytic activity, and reduction of the amount of the precious metal element silver.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis in environmental treatment, in particular to an Ag 3 PO 4 / BiVO 4 Preparation method of heterojunction composite photocatalyst. Background technique [0002] Environmental pollution and energy shortage are the major challenges that humans need to solve at present, and they are major issues that must be considered first in the implementation of sustainable development strategies in my country and the world. Photocatalytic technology is widely used in clean energy production due to its low cost and environmental friendliness Therefore, the development of high-efficiency visible light-responsive semiconductor photocatalysts is the key to the photocatalytic process. At present, the important factor that limits the wide application of photocatalysis in clean energy production and environmental purification is the photocatalyst. Visible light activity is low. [0003] BiVO 4 It has three cryst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/198
Inventor 齐雪梅吴江李忺吴强谷苗莉龙慧敏
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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