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Preparation method of manganese oxide yttrium semiconductor photocatalytic powder

A semiconductor and photocatalytic technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of fast speed, short reaction cycle and simple operation

Inactive Publication Date: 2013-01-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the preparation of yttrium manganate semiconductor photocatalytic materials by microwave hydrothermal assisted solid phase method.

Method used

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  • Preparation method of manganese oxide yttrium semiconductor photocatalytic powder
  • Preparation method of manganese oxide yttrium semiconductor photocatalytic powder
  • Preparation method of manganese oxide yttrium semiconductor photocatalytic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The pH of the precursor solution of the yttrium manganate semiconductor photocatalytic powder prepared in this example is 8.

[0027] Step 1: getting concentration is the uniform solution A of yttrium nitrate of 0.1mol / L, and concentration is the uniform solution B of potassium permanganate and 50% manganese nitrate solution C of 0.1mol / L;

[0028] Step 2: According to the molar ratio of Y / Mn: 1:1.5, Mn 7+ :Mn 2+ The molar ratio is: 1:4 Add solutions B and C to solution A, add deionized water and stir evenly, so that the concentration of yttrium nitrate is 0.0625mol / L; adjust to pH 8 to form a uniform co-precipitation precursor D ;

[0029] Step 3: Pour the co-precipitation precursor D into the microwave hydrothermal reaction kettle, control the filling degree to 40%, seal the reaction, first keep it at 100°C for 5 minutes, then keep it at 125°C for 5 minutes, then keep it at 150°C for 10 minutes, and then Incubate at 175°C for 15 minutes, and finally at 200°C for 30...

Embodiment 2

[0032] The pH of the precursor solution of the yttrium manganate nanopowder prepared in this example is 14.

[0033] Step 1: getting concentration is the uniform solution A of yttrium nitrate of 0.1mol / L, and concentration is the uniform solution B of potassium permanganate and 50% manganese nitrate solution C of 0.1mol / L;

[0034] Step 2: According to the molar ratio of Y / Mn: 1:1.5, Mn 7+ :Mn 2+ The molar ratio is: 1:4 Add solutions B and C to solution A, add deionized water and stir evenly, so that the concentration of yttrium nitrate is 0.0625mol / L; adjust to pH 14 to form a uniform co-precipitation precursor D ;

[0035] Step 3: Pour the co-precipitation precursor D into the microwave hydrothermal reaction kettle, control the filling degree to 40%, seal the reaction, first keep it at 100°C for 5 minutes, then keep it at 125°C for 5 minutes, then keep it at 150°C for 10 minutes, and then Incubate at 175°C for 15 minutes, and finally at 200°C for 30 minutes. After the re...

Embodiment 3

[0038] Step 1: getting concentration is the uniform solution A of yttrium nitrate of 0.1mol / L, and concentration is the uniform solution B of potassium permanganate and 50% manganese nitrate solution C of 0.1mol / L;

[0039] Step 2: According to the molar ratio of Y / Mn: 1:1.5, Mn 7+ :Mn 2+ The molar ratio is: 1:4 Add solutions B and C to solution A, add deionized water and stir evenly, so that the concentration of yttrium nitrate is 0.0625mol / L; adjust to pH 10 to form a uniform co-precipitation precursor D ;

[0040] Step 3: Pour the co-precipitation precursor D into the microwave hydrothermal reaction kettle, control the filling degree to 40%, seal the reaction, first keep it at 100°C for 5 minutes, then keep it at 125°C for 5 minutes, then keep it at 150°C for 10 minutes, and then Incubate at 175°C for 15 minutes, and finally at 200°C for 30 minutes. After the reaction is completed, cool to room temperature;

[0041] Step 4: Take out the material in the reaction kettle a...

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Abstract

The invention provides a preparation method of manganese oxide yttrium semiconductor photocatalytic powder. The method comprises dissolving yttrium nitrate, potassium permanganate and manganese nitrate into deionized water in accordance with a Y / Mn mole ratio of 1 : 1.5 and a Mn<7+> : Mn<2+> mole ratio of 1 : 4; adding sodium hydroxide into the solution in drops, adjusting a pH value to 8 to 14 and forming a uniform precursor solution; pouring the precursor solution into a hydrothermal reactor and sealing; putting into a microwave digestion system for microwave hydrothermal synthesis, cooling to room temperature, washing the product for several times with the deionized water and absolute ethyl alcohol, and then calcining under 1100 DEG C. By using a microwave hydrothermal method in addition to a solid-phase method, the preparation method can effectively reduce reaction temperature and improve powder activity. The manganese oxide yttrium powder prepared by the method has a narrow optical band gap (Eg=1.55 eV), and meanwhile, has an absorption wavelength of more than 800 nm, thereby being of great significance for exploring new types of semiconductor photocatalytic materials capable of responding to visible light.

Description

technical field [0001] The invention relates to a preparation method of semiconductor photocatalytic powder, in particular to a preparation method of yttrium manganate semiconductor photocatalytic powder. Background technique [0002] With the continuous development of science and technology, the problem of environmental pollution is becoming more and more serious, and the development of photocatalytic materials to deal with environmental pollution and purify the environment has attracted more and more attention. General photocatalytic materials are difficult to meet the needs of industry, so the development of new energy sources to protect the environment, degrade organic pollutants, and improve urban air quality have long been the main research topics in the field of catalysis. As far as the country is concerned, new energy sources with good prospects for energy development include water energy, wind energy, solar energy, hydrogen energy and biomass energy. Among them, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/34B01J23/32
Inventor 蒲永平刘丹石轩罗玥玥
Owner SHAANXI UNIV OF SCI & TECH
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