Use of bismuth oxyhalide

A bismuth oxyhalide and photocatalytic technology, which is applied in the fields of dye degradation, photolysis of water to produce hydrogen, bactericidal materials, degradation of organic harmful gases, and photocatalytic materials. It can solve the problems of low quantum yield, photochemical corrosion, and poor photocatalytic activity of powders. And other issues

Inactive Publication Date: 2007-08-22
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these works are very effective, their quantum yield is not high, and it is difficult to be used in photocatalytic cracking of water to produce hydrogen. Therefore, finding new high-efficiency photocatalysts has become one of the most important topics in this field.
According to the discovered photocatalytic materials, their systems can be classified into oxides, sulfides, oxysulfides, nitrides and oxynitrides, among which oxides often have better (photo) chemical stability; sulfides and Although oxysulfide can show relatively ideal visible light response characteristics, it is prone to photochemical corrosion as a photocatalytic material; nitride and oxynitride also have good visible light absorption characteristics, and the photocatalytic effect of the material itself is not ideal, but in After loading noble metals or their oxides with strong electron affinity, the photocatalytic activity can be dramatically improved, such as (GaN) loaded with Rh-Cr nanocomposite oxides. x (ZnO) 1-x The hydrogen production rate of solid solution powder photocatalytic cracking of water in response to visible light can reach the order of mmol / h, while the photocatalytic activity of unsupported powder is extremely poor

Method used

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  • Use of bismuth oxyhalide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Bi 2 o 3 The powder is dissolved in the corresponding concentrated halogen acid, adjusted to pH = 3 with dilute ammonia water, and filtered several times until no X is detected - After ions (tested with silver nitrate solution), the precipitate is dried at 80°C to obtain the finished nano photocatalytic powder.

[0042] The specific process of the loaded BiOX (X=Cl, Br, I) photocatalytic material can be: take 2g of BiOX (X=Cl, Br, I) catalyst powder and put it into a beaker containing 100ml of deionized water, add 10ml of methanol Hole sacrificial agent and appropriate amount of AgNO 3 or H 2 PtCl 6 ·6H 2 O, under a 300W mercury lamp for 85-10 hours while vigorously stirring, after several times of filtration, washing, and drying, the photocatalytic material loaded with nano-Ag or Pt particles can be obtained.

[0043] The experiment of photocatalytic degradation of organic substance methyl orange shows that the UV photocatalytic performance of BiOX (X=Cl, Br) is ...

Embodiment 2

[0048] Bi of the stoichiometric ratio 2 o 3 and BiX 3 (X=Cl, Br, I) was placed in a quartz tube, vacuumized and packaged, and heated at 550° C. for 12 hours. After cooling, open the tube and grind to get the finished photocatalytic powder.

[0049] Photocatalytic degradation of dye methyl orange, photolysis of water to produce hydrogen, degradation of harmful substance formaldehyde and bactericidal test results are about 40% of those in Embodiment 1, which may be due to the smaller specific surface area of ​​the sample prepared by the same phase method.

Embodiment 3

[0051] Take 100ml of deionized water in a beaker, use the corresponding halogen acid to adjust the pH of the solution to less than 1, then heat the solution to about 70°C, while stirring continuously, slowly add 1mol of bismuth nitrate-halogen acid solution, and at the same time slowly add 15% NaOH solution to neutralize the HNO produced by hydrolysis 3 , maintain the pH value at around 2, and the whole process lasts for about 1 hour. During this period, the temperature was kept constant at about 75°C, continued to stir for 10 minutes, cooled, filtered, washed, and dried at 80°C to obtain the finished photocatalytic powder.

[0052] The performance test result is basically the same as that of Example 1.

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Abstract

The present invention belongs to the field of photocatalyst material technology, and is especially use of bismuth oxyhalide. Bismuth oxyhalide as photocatalyst material is prepared through one solid phase or liquid phase process. It has the chemical composition of BiOX, where, X=Cl, Br or I; and laminated crystal confuration formed with [Bi2O2] and [X] structural layers stacked alternately in the C axis direction. Bismuth oxyhalide has excellent photocatalytic performance. It is used in degrading organic dye and harmful organic gas, killing bacteria and photolyzing water to produce hydrogen. Supporting nanometer Ag, Pt or other metal particle with powerful electron affinity can raise the photocatalytic performance greatly.

Description

technical field [0001] The invention relates to the application of a bismuth oxyhalide material, in particular to its photocatalytic application, and belongs to the field of photocatalytic materials, especially the fields of dye degradation, hydrogen production by photolysis of water, degradation of organic harmful gases, bactericidal materials and the like. Background technique [0002] Since 1972 Fujishima and Honda discovered in TiO 2 Since the phenomenon of photoresponsive hydrogen production on the surface of electrode materials, photocatalysis has attracted worldwide attention as a potential technology to solve environmental pollution and energy crisis. In the process of semiconductor photocatalysis, light irradiation excites electrons in the valence band to transition to the conduction band, that is, photogenerated electrons are formed on the conduction band and photogenerated holes are formed on the valence band; Under the influence of the environment, complex oxida...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/08B01J27/13A61L9/22C01B3/04
CPCY02E60/364Y02E60/36
Inventor 黄富强王文邓林信平
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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