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Block-shaped Ag2MoO4@Ag@AgBr ternary complex and preparation method and application thereof

A ternary composite, block-shaped technology, applied in the field of material chemistry, can solve the problems of less research, and achieve the effects of simple preparation method, balanced morphology and low cost

Active Publication Date: 2017-01-04
XUCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Ag 2 MoO 4 It belongs to a wide bandgap semiconductor material with a direct band gap of 3.31eV. It is an environmentally friendly semiconductor material with simple synthesis, low toxicity, good stability, and long service life. It has been used in many fields, but There are relatively few researches on photocatalysis. In addition, compared with the current similar research, there are some improvements in the synthesis method. The traditional method is to carry out high temperature and high pressure reaction in the reactor, which is in terms of safety and energy consumption. There are certain defects

Method used

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  • Block-shaped Ag2MoO4@Ag@AgBr ternary complex and preparation method and application thereof
  • Block-shaped Ag2MoO4@Ag@AgBr ternary complex and preparation method and application thereof
  • Block-shaped Ag2MoO4@Ag@AgBr ternary complex and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0055] Preparation of Cube Ag 2 MoO 4 @Ag@AgBr ternary complex, the specific steps are as follows:

[0056] 1. In 20mL ethylene glycol, add 2mmol silver nitrate and 1.2g PVP successively to dissolve to obtain a mixed solution of silver nitrate and PVP; in 50mL ethylene glycol, add 1mmol sodium molybdate and stir to dissolve; mix silver nitrate and PVP Add the solution dropwise to the sodium molybdate solution, adjust the pH to about 6.7 with ammonia water, stir it magnetically for 10 minutes, transfer it to a round bottom flask, and react in a constant temperature oil bath at 60°C for 12 hours. The product was washed with distilled water and absolute ethanol for more than 2 times, and dried at a constant temperature of 70°C for 12 hours to obtain the intermediate product square-shaped Ag 2 MoO 4 @Ag.

[0057] The resulting intermediate product, square-shaped Ag 2 MoO 4 For scanning electron micrographs of @Ag see figure 1 , X Ray diffraction pattern (XRD) see figure...

Embodiment 2

[0073] Preparation of Cube Ag 2 MoO 4 @Ag@AgBr ternary complex, the specific steps are as follows:

[0074] 1. In 20mL ethylene glycol, add 2mmol silver nitrate and 1.2g PVP in order to dissolve; in 50mL ethylene glycol, add 1mmol sodium molybdate to dissolve with magnetic stirring, and add the mixed solution of silver nitrate and PVP dropwise to the sodium molybdate solution , adjust the pH to about 6 with ammonia water, transfer to a round-bottomed flask after magnetic stirring for 10 minutes, and react for 10 hours in a constant temperature oil bath at 55°C. The product was washed with distilled water and absolute ethanol for more than 2 times, and dried at a constant temperature of 70°C for 12 hours to obtain the intermediate product square-shaped Ag 2 MoO 4 @Ag.

[0075] The resulting intermediate product, square-shaped Ag 2 MoO 4 For scanning electron micrographs of @Ag see Figure 9 , X-ray diffraction pattern (XRD) see Figure 10 .

[0076] 2. Take 0.3757g of ...

Embodiment 3

[0079] Preparation of Cube Ag 2 MoO 4 @Ag@AgBr ternary complex, the specific steps are as follows:

[0080] 1. In 20mL ethylene glycol, add 2mmol silver nitrate and 1.2g PVP in order to dissolve; in 50mL ethylene glycol, add 1mmol sodium molybdate to dissolve with magnetic stirring, and add the mixed solution of silver nitrate and PVP dropwise to the sodium molybdate solution , the pH was adjusted to about 8 with ammonia water, the mixture was stirred by magnetic force for 10 minutes, then transferred to a round bottom flask, and reacted in a constant temperature oil bath at 75°C for 14 hours. The product was washed with distilled water and absolute ethanol for more than 2 times, and dried at a constant temperature of 70°C to obtain a square Ag 2 MoO 4 @Ag.

[0081] The resulting intermediate product, square-shaped Ag 2 MoO 4 For scanning electron micrographs of @Ag see Figure 13 , X Ray diffraction pattern (XRD) see Figure 14 .

[0082] 2. Take 0.3757g of the inte...

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Abstract

The invention relates to a block-shaped Ag2MoO4@Ag@AgBr ternary complex, a preparation method thereof and application of the block-shaped Ag2MoO4@Ag@AgBr ternary complex to photocatalysis. With sodium molybdate and silver nitrate being raw materials and ethylene glycol being a reaction medium, the pH value of a system is controlled to be 6-8 on the condition that PVP is added, a reaction is carried out, and then block-shaped Ag2MoO4@Ag is obtained; next, based on the principle of ion exchange, with CTAB being a bromine source and ethyl alcohol being a solvent, a reaction with the Ag2MoO4@Ag is carried out, and then the final product, namely the block-shaped Ag2MoO4@Ag@AgBr ternary complex, is obtained. The final product has a single appearance and is even in size; when the final product is used as a catalyst to degrade RhB(15mg / L) dye solution, the degrading rate reaches 91% within 35 minutes under visible light, and complete degrading is achieved within 20 minutes under sunlight. in addition, under the visible light, a catalytic cycle reaction is carried out four times on the ternary complex, and the catalysis effect is not influenced greatly, which shows that the block-shaped Ag2MoO4@Ag@AgBr ternary complex has high catalytic activity and stability.

Description

technical field [0001] The invention belongs to the technical field of material chemistry and relates to a square Ag 2 MoO 4 @Ag@AgBr ternary composite and its preparation method and application in photocatalysis. Background technique [0002] Environmental pollution is one of the major issues affecting human survival and development. Photocatalytic technology has high catalytic activity and stability, low price, and environmental friendliness, and has great potential in the field of environmental pollution control. Commonly used TiO 2 Photocatalysts have disadvantages such as low quantum efficiency and inability to effectively utilize visible light, while the built-in electric field of the heterojunction can inhibit photoinduced charge recombination and improve quantum efficiency. If TiO 2 Form a heterojunction with a narrow-band semiconductor, and the sensitization of the narrow-band semiconductor can expand the TiO 2 The response spectrum range is expected to overcom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/132C02F1/30C02F1/32C02F101/38C02F101/34
CPCC02F1/30C02F1/32B01J27/132C02F2305/10C02F2101/38C02F2101/34C02F2101/308B01J35/39
Inventor 张艳鸽瞿佳华王雄李品将杨晓刚法文君郑直杨风岭
Owner XUCHANG UNIV
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