Silver vanadate/silver carbonate p-n heterojunction composite photocatalyst as well as preparation method and application thereof

A photocatalyst, silver carbonate technology, applied in the field of chemistry, can solve the problems of small flat-band potential difference of semiconductor, unable to form built-in electric field, unable to further improve the separation of photogenerated electron-hole pairs, etc., to achieve stable photocatalytic performance, convenient The effect of industrialized utilization and good practical application prospect

Active Publication Date: 2020-04-10
HUNAN AGRICULTURAL UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, after the formation of the heterojunction, due to the small difference in the semiconductor flat band potential on both sides of the heterojunction interface, an effective built-in electric field cannot be formed at the semiconductor contact interface.
Therefore, the weak built-in electric field cannot further improve the separation of photogenerated electron-hole pairs

Method used

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  • Silver vanadate/silver carbonate p-n heterojunction composite photocatalyst as well as preparation method and application thereof
  • Silver vanadate/silver carbonate p-n heterojunction composite photocatalyst as well as preparation method and application thereof
  • Silver vanadate/silver carbonate p-n heterojunction composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0036] A silver vanadate / silver carbonate p-n heterojunction composite photocatalyst, the silver vanadate / silver carbonate p-n heterojunction composite photocatalyst uses silver carbonate as a carrier, and the silver vanadate is modified on the silver vanadate.

[0037] In this embodiment, the mass percentage of silver carbonate in the silver vanadate / silver carbonate composite photocatalyst is 50%, and the mass percentage of silver vanadate is 50%.

[0038] In this embodiment, silver carbonate has a rod-like structure and is a p-type semiconductor; silver vanadate has a nano-particle structure and is an n-type semiconductor.

[0039] A kind of preparation method of the silver vanadate / silver carbonate composite photocatalyst of above-mentioned present embodiment, comprises the following steps:

[0040] (1) Dissolve 1.0499 g of silver nitrate in 20 mL of deionized water under dark stirring conditions, and continue stirring for 20 minutes to obtain a silver nitrate solution.

[...

Embodiment 2

[0049] A silver vanadate / silver carbonate composite photocatalyst is basically the same as the silver vanadate / silver carbonate composite photocatalyst in embodiment 1, the difference is only: vanadic acid in the silver vanadate / silver carbonate composite photocatalyst of embodiment 2 The mass percentage of silver is 33%, and the mass percentage of silver carbonate is 67%.

[0050] A preparation method of the above-mentioned silver vanadate / silver carbonate composite photocatalyst of the present embodiment is basically the same as the preparation method in Example 1, the difference is only that the quality of silver nitrate used in Example 2 is 1.5913g, sodium bicarbonate The mass of 0.2675g,.

[0051] The silver vanadate / silver carbonate composite photocatalyst prepared in Example 2 is named VC-12.

[0052] figure 1 The silver vanadate / silver carbonate composite photocatalyst (VC-12) that the embodiment of the present invention 2 makes, the rod-shaped silver carbonate (Ag ...

Embodiment 3

[0054] A silver vanadate / silver carbonate composite photocatalyst is basically the same as the silver vanadate / silver carbonate composite photocatalyst in embodiment 1, the difference is only: vanadic acid in the silver vanadate / silver carbonate composite photocatalyst of embodiment 3 The mass percentage of silver is 25%, and the mass percentage of silver carbonate is 75%.

[0055] A preparation method of the silver vanadate / silver carbonate composite photocatalyst of the above-mentioned present embodiment is basically the same as the preparation method in Example 1, the difference is only that the quality of silver nitrate used in Example 2 is 2.1304g, sodium bicarbonate The mass of 0.4008g,.

[0056] The silver vanadate / silver carbonate composite photocatalyst prepared in Example 3 is named VC-13.

[0057] Ag in the silver vanadate / silver carbonate composite photocatalyst VC-11 that embodiment 1~3 makes, VC-12, VC-13, comparative example 1 2 CO 3 and Ag in Comparative Exa...

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Abstract

The invention discloses a silver vanadate/silver carbonate p-n heterojunction composite photocatalyst as well as a preparation method and application thereof. The silver vanadate/silver carbonate p-nheterojunction composite photocatalyst is prepared by taking silver carbonate as a carrier, and the silver carbonate is coated with silver vanadate. The composite photocatalyst has the advantages of high photo-induced electron-hole separation efficiency, high photocatalytic activity, strong light absorption capability, good stability, corrosion resistance and the like, and is a novel visible lightcatalyst, and the preparation method has the advantages of simple and convenient synthesis method, low raw material cost, low energy consumption, short time consumption, easily-controlled conditionsand the like, and is suitable for popularization and application. The composite photocatalyst disclosed by the invention can be used for degrading antibiotic wastewater and dye wastewater, has the advantages of stable photocatalytic performance, strong corrosion resistance and high pollutant degradation efficiency, and has a very good practical application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemistry, in particular to the technical field of photocatalysis, and relates to a silver vanadate / silver carbonate p-n heterojunction composite photocatalyst and its preparation method and application. Background technique [0002] The degradation of refractory organic substances by semiconductor photocatalytic materials has gradually attracted widespread attention in the field of environmental restoration. However, most photocatalysts are limited by their weak absorption of visible light and high recombination rate of photogenerated carriers. Therefore, the research on improving the visible light utilization and stability of photocatalysts has become of great significance. As a modification method, heterojunction can improve the migration and separation of photogenerated electron-hole pairs of composite materials and expand the range of light absorption, thereby solving the original shortcomings of ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/232C02F1/30C02F101/30C02F101/38C02F103/34
CPCB01J35/004B01J27/232C02F1/30C02F2101/308C02F2101/38C02F2101/40C02F2305/10C02F2103/343C02F2305/023Y02W10/37
Inventor 孙海波秦普丰吴志斌郭佳茵罗帅柴友正黄驰岳戴之健
Owner HUNAN AGRICULTURAL UNIV
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