Preparation method of alkali metal tantalate composite visible-light photocatalyst for hydrogen production from photodissociation of water

A photocatalyst and alkali metal technology, which is applied in the field of preparation of alkali metal tantalate-based composite photocatalysts for the production of visible light from water splitting, can solve problems such as nitrogen doping of alkali metal tantalate, and achieve good visible absorption, high Visible light catalytic activity, the effect of good visible light catalytic activity

Inactive Publication Date: 2009-07-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing an alkali metal tantalate-based composite photocatalyst for hydrogen production by photolysis of visible light, which solves the problem of nitrogen doping

Method used

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  • Preparation method of alkali metal tantalate composite visible-light photocatalyst for hydrogen production from photodissociation of water
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  • Preparation method of alkali metal tantalate composite visible-light photocatalyst for hydrogen production from photodissociation of water

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Embodiment 1

[0022] Dissolve 0.2g of P123 surfactant in 20mL of 7molL -1 of hydrochloric acid solution. After stirring for 1h, take 1g of tantalum pentachloride and add it, and then stir for 1h. Ammonia solution with a mass concentration of 1.25% was added dropwise while stirring until the pH of the solution was pH=7. Stop stirring, and after precipitation, take all the precipitate and 60 mL of the solution, add 5 g of sodium hydroxide, and stir for 30 min to completely dissolve it. All of the above procedures were carried out in an ice bath. It was transferred to an 80mL reactor and subjected to hydrothermal treatment at 140°C for 10h. After cooling, the product was obtained, and the product was washed with deionized water several times to remove sodium hydroxide, and then dried at 60° C. for 24 hours. Then it is heat-treated for 1h under the condition of passing oxygen at 400°C (the heating rate of the furnace is 5Kmin -1 ), remove a small amount of P123 remaining in the product, an...

Embodiment 2

[0029] Dissolve 0.2g of CTAB surfactant in 20mL of 6molL -1 of hydrochloric acid solution. After stirring for 2h, take 1g of tantalum pentachloride and add it, and then stir for 1h. Ammonia solution with a mass concentration of 1.25% was added dropwise while stirring until the pH of the solution was pH=8. Stop stirring, and after precipitation, take all the precipitate and 60 mL of the solution, add 10 g of potassium hydroxide, and stir for 30 min to completely dissolve it. All of the above procedures were carried out in an ice bath. It was transferred to an 80mL reactor and subjected to hydrothermal treatment at 120°C for 15h. After cooling, the product was obtained, and the product was washed with deionized water several times to remove potassium hydroxide, and then dried at 60° C. for 24 hours. Then it is heat-treated for 1h under the condition of passing oxygen at 400°C (the heating rate of the furnace is 5Kmin -1 ), remove a small amount of CTAB remaining in the prod...

Embodiment 3

[0031]Add 0.2g of P123 into 60mL of deionized water (pH=6), stir for 1h and then add 0.8g of Ta 2 o 5 , and stirred for 1h. Then add 2g NaOH and stir for 30min. All the above steps are carried out in ice bath. It was transferred to an 80mL reactor and subjected to hydrothermal treatment at 140°C for 20h. After cooling, the product was obtained, and the product was washed with deionized water several times to remove sodium hydroxide. Then dry at 60°C for 24h, then heat-treat it at 400°C for 1h under the condition of oxygen flow (the heating rate of the furnace is 5Kmin -1 ), remove a small amount of P123 remaining in the product, and finally obtain pure sodium tantalate. Get the sodium tantalate of the hydrothermal synthesis of 0.5g, under 850 ℃ (heating rate 10Kmin -1 ), through ammonia gas 25mLmin -1 The flow rate, nitriding treatment 10h, obtain nitrogen-doped sodium tantalate, the nitrogen doping amount of this embodiment is 4wt%, its characterization and performance ...

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Abstract

The invention relates to a preparation method for an alkali tantalate based composite visible-light photocatalyst in hydrogen production by water splitting, in particular to a method that ammonia is used as the nitrogen source to perform nitrogen doping on the alkali tantalate at high temperature. The method has the following steps: (1) dissolving the tantalum-containing precursor in the surfactant acidic solution to produce a uniform tantalum salt solution; (2) adjusting the PH value to 6-9 and adding the hydroxide of an alkali metal to produce a suspension; (3) water-heating the produced suspension in a reaction kettle to produce the alkali tantalate crystal and (4) treating the crystal with the ammonia to produce the alkali tantalate, and then obtaining the nitrogen doped alkali tantalate. The photocatalyst treats the alkali tantalate by high-temperature ammonolysis, which realizes nitrogen doping to the alkali tantalate. The experiment shows that the alkali tantalate is nitrogen doped in the preparation process which has good visible light catalysis and solves the problem of nitrogen doping to the alkali tantalate.

Description

technical field [0001] The invention relates to a preparation method of an alkali metal tantalate-based composite photocatalyst for hydrogen production by photolysis of visible light, specifically a method for nitrogen-doping alkali metal tantalate at high temperature with ammonia gas as a nitrogen source. Background technique [0002] In the era of energy crisis, the development of new clean energy is very important, and the utilization of solar energy provides a new idea for clean energy. At present, the main way to utilize solar energy is thermal energy, and photochemical processes occur on photocatalysts to convert solar energy into electrical energy or hydrogen that can be used directly. The process of photocatalytic hydrogen generation is to use solar energy to excite photocatalytic materials to generate electrons and holes, and then undergo redox reactions with reactants respectively. Photocatalysts have shown broad application prospects in the fields of material sel...

Claims

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Application Information

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IPC IPC(8): B01J23/20B01J27/24C01B3/04
CPCY02E60/364Y02E60/36
Inventor 成会明王学文刘岗李峰逯高清
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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