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High-performance photocatalyst for water treatment and preparation method thereof

A photocatalyst, high-performance technology, applied in the field of water treatment, can solve problems such as difficult to optimize performance and poor performance, and achieve the effect of improving water treatment performance and improving separation efficiency

Inactive Publication Date: 2015-08-12
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Current research has found that the recombination of electrons and holes in bismuth vanadate crystals is one of the reasons for its poor performance, and it is also the main problem in its practical application.
The construction of heterojunction is one of the main means to improve the separation of photogenerated electrons and holes in catalysts. At present, the heterostructure of photocatalysts is mostly built by soaking-calcining method. The heterojunction constructed by this method will be randomly formed on the surface of the photocatalyst. Its performance is difficult to optimize

Method used

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  • High-performance photocatalyst for water treatment and preparation method thereof
  • High-performance photocatalyst for water treatment and preparation method thereof

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Embodiment 1

[0029] (1) 50mmol Bi(NO 3 ) 3 ·5H 2 O dissolved in 10 mL 4.0M HNO 3 In, then add 50mmol NH 4 VO 3 Dissolve to 10mL 2.0M NaOH solution, then mix the two solutions, adjust the pH to 1.0 with NaOH solution after mixing, react the mixed solution by hydrothermal reaction for 12 hours, and centrifuge the obtained crystals to obtain monoclinic bismuth vanadate ( figure 1 a).

[0030] (2) Disperse 0.1 g of monoclinic bismuth vanadate prepared in step (1) to 2 g / L AgNO 3 In the solution, the visible light source was used to treat the solution for 4 hours to achieve the deposition of metal particles Ag on the {010} crystal plane, and then selectively construct the metal-semiconductor heterojunction on the {010} crystal plane ( figure 1 b);

[0031] (3) Disperse 0.1 g of monoclinic bismuth vanadate prepared in step (1) into 50 mL of 1.456 g / L Co(NO 3 ) 2 and 4g / L NaIO 3 In the mixed solution, simulated sunlight was used to treat the solution for 4 hours to achieve the depositi...

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Abstract

The invention relates to a water treatment method, and specifically relates to a high-performance photocatalyst for water treatment and a preparation method thereof. The catalyst is prepared by constructing an Ag-BiVO4 metal-semiconductor heterojunction on the monoclinic bismuth vanadate crystal face {010}, constructing a Co3O4-BiVO4<p-n> heterojunction on the monoclinic bismuth vanadate crystal face {110}, or constructing an Ag-BiVO4 metal-semiconductor heterojunction and a Co3O4-BiVO4<p-n> heterojunction on the monoclinic bismuth vanadate crystal face {010} and {110} respectively. The operation is simple and practical, no expensive equipment is required, and the reagents are environment-friendly.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a high-performance photocatalyst for water treatment and a preparation method thereof. Background technique [0002] Water treatment plays a vital role in human health. At present, there are many methods for water treatment, including ultraviolet irradiation and so on. However, there are many problems in these methods, such as the generation of toxic by-products, the consumption of energy and so on. Photocatalytic water treatment technology is currently recognized as an environmentally friendly water treatment technology. Compared with other techniques, it has no selectivity, no need to add chemical reagents, etc. Existing studies have confirmed that titanium oxide has excellent photocatalytic properties. However, due to its wide energy band width, titanium oxide can only absorb and utilize ultraviolet light, which brings great limitations to its application. [0003] In order to ...

Claims

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Application Information

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IPC IPC(8): B01J23/68B01J23/89C02F1/30C02F101/38
Inventor 王鹏张盾
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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