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Composite photocatalyst for photolyzing water and degrading pollutants and preparation method thereof

A technology of catalyst and composite light, which is applied in the field of photocatalyst and inorganic semiconductor photocatalysis, can solve the problems of complex catalyst synthesis process, long preparation cycle, low application prospect, etc., achieve good scalability, realize removal, and increase specific surface area Effect

Inactive Publication Date: 2018-11-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis process of the above-mentioned catalyst is complicated, the preparation cycle is long, and the obtained material is a simple metal oxide, and it cannot completely split water, so it has a low application prospect.

Method used

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  • Composite photocatalyst for photolyzing water and degrading pollutants and preparation method thereof
  • Composite photocatalyst for photolyzing water and degrading pollutants and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This example involves a preparation method of a composite photocatalyst with ordered mesoporous morphology and its photolysis water activity test:

[0038] Step 1, weigh 0.5464g of citric acid monohydrate and 0.1241g of ethylene glycol and dissolve in 15ml of deionized water; the pH value of the complex solution is 2.0;

[0039] Step 2, take by weighing 0.4851g bismuth nitrate pentahydrate Bi(NO 3 ) 3 ·5H 2 O as bismuth source, 0.3830g yttrium nitrate hexahydrate Y (NO 3 ) 3 ·6H 2 O as yttrium source, 0.2340 g ammonium metavanadate NH 4 VO 3 As a vanadium source, add it to the solution obtained in step 1 in sequence, stir magnetically for 30 minutes and disperse ultrasonically for 30 minutes to form a uniform suspension; weigh 0.334 g of the prepared silica template (SBA-15) (TEM image see figure 1 ),from figure 1 It can be seen that the prepared SBA-15 has a good mesoporous channel structure with a pore diameter of about 6 nm and a wall thickness of about 5 nm....

Embodiment 1-1

[0061] This example is a modification example of Example 1, which only involves changing the calcination temperature and time: specifically, in Step 3 of Example 1: evaporate the suspension obtained in Step 2 to dryness in a water bath at 80°C, and place it in an oven at 80°C After drying for 12 hours, grind and collect, put it into a porcelain crucible with a volume of 50ml, raise the temperature in a muffle furnace at a rate of 1°C / min to 600°C and keep it calcined for 12 hours. After cooling, take it out and grind it to obtain a dry powder solid The same; other steps and test conditions remain unchanged. The average hydrogen and oxygen production rates obtained in the test were 128.3 μmol / h and 59.4 μmol / h, respectively.

Embodiment 1-2

[0063] This example is a modification example of Example 1, which only involves changing the calcination temperature and time: specifically, in Step 3 of Example 1: evaporate the suspension obtained in Step 2 to dryness in a water bath at 80°C, and place it in an oven at 80°C After drying for 12 hours, grind and collect, put it into a porcelain crucible with a volume of 50ml, raise the temperature in a muffle furnace at a rate of 1°C / min to 400°C and keep it calcined for 6 hours. After cooling, take it out and grind it to obtain a dry powder solid The same; other steps and test conditions remain unchanged. The average hydrogen and oxygen production rates obtained in the test were 5.4 μmol / h and 8.7 μmol / h, respectively.

[0064] Through experimental characterization, the results show that composite structures and solid solutions can be formed at 400°C, but the low activity is due to the low temperature and time, and the crystallinity is not high enough.

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Abstract

The invention provides a composite photocatalyst for photolyzing water and degrading pollutants and a preparation method thereof. The composite photocatalyst can realize efficient transformation fromsolar energy to chemical energy, and is mainly prepared by compounding a mesoporous template and photocatalytic active components in the aspect of a nano-scale; the photocatalytic active components are nanoparticles of compound metal salt; the compounding is realized by uniformly dispersing the photocatalytic active components in a pore channel framework of the mesoporous template; the compoundingis realized through the following steps: complexing a soluble metal salt precursor and a complexing agent and dispersing into a pore channel of the mesoporous template; then carrying out high-temperature calcination under a limited area environment. The catalyst provided by the invention is mainly used for photocatalytically decomposing water to produce hydrogen or photocatalytically degrading organic pollutants including VOC (Volatile Organic Compound), s-VOC (semi-Volatile Organic Compound) and the like in the water or air under sunlight. The catalyst provided by the invention has good stability and good dispersity; platinum or other co-catalysts are loaded, so that the composite photocatalyst has very high activity on photocatalytic complete decomposition on the water and photocatalytic degradation on organic matters.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a composite photocatalyst for photolysis of water and degradation of pollutants and a preparation method thereof. The invention provides a preparation of a composite photocatalyst compounded with a porous material, in particular a composite photocatalyst with a certain mesoporous morphology, which is used in the technical field of inorganic semiconductor photocatalysis. Background technique [0002] Photocatalysis is a new technology that uses light energy (solar energy) to realize the energy conversion from solar energy to hydrogen energy and the removal of organic pollutants in wastewater with the help of a suitable catalyst. Because it can provide an ideal solution for today's increasingly serious energy problems and environmental problems, and has the advantages of low cost, mild reaction conditions, easy operation, and no secondary pollution, it is a new type of energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03C01B3/04
CPCC01B3/042B01J29/0341C01B2203/0277B01J35/39Y02E60/36
Inventor 江治黄政文上官文峰
Owner SHANGHAI JIAO TONG UNIV
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