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Co-modified Ni<2+> doped modified Ta3N5 photocatalytic hydrogen-producing material and preparation method thereof

A technology of hydrogen materials and photocatalysis, applied in the direction of physical/chemical process catalysts, hydrogen production, chemical instruments and methods, etc., can solve the problems of destroying the stability of material structures, achieve enhanced structural and chemical stability, and promote Separation and transport process, the effect of enhancing electron transport performance

Pending Publication Date: 2020-01-14
彭正宽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a Co-modified Ni 2+ Doped modified Ta 3 N 5 Photocatalytic hydrogen production material and its preparation method solve the problem of existing unmodified tantalum nitride Ta 3 N 5 The holes generated under the light will dissipate the N in themselves 3- Ions are oxidized to N 2- ion, making Ta 3 N 5 The matrix decomposes and destroys the structural stability of the material, and at the same time solves the problem of Ta 3 N 5 The generated photo-generated electrons and holes are easily recombined, reducing the problem of photo-generated electron-hole generation

Method used

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preparation example Construction

[0024] Co-modified Ni 2+ Doped modified Ta 3 N 5The preparation method of photocatalytic hydrogen production material comprises the following steps:

[0025] (1) Add an appropriate amount of absolute ethanol and distilled water as a mixed solvent into the reaction flask, the volume ratio of the two is 5-7:1, add 90-95 parts of TaCl 5 Stir until dissolved, slowly add NaOH while stirring to adjust the pH of the solution to 11-12, then add 3-6 parts of NiCl 2 , transfer the solution into an automatic hydrothermal reaction kettle, raise the temperature to 170-180°C, stir at a constant speed for 4-6 hours, cool the solution to room temperature, filter to remove the solvent, wash the solid product with distilled water, and place it in a blast dryer Heating to 80-90°C and fully drying to obtain a Ni-Ta precursor.

[0026] (2) Place the Ni-Ta precursor in an atmosphere resistance furnace, and feed air and high-purity O 2 , the volume ratio of the two is 10-15:1, the heating rate ...

Embodiment 1

[0031] (1) Preparation of Ni-Ta precursor 1: add an appropriate amount of absolute ethanol and distilled water as a mixed solvent into the reaction flask, the volume ratio of the two is 5:1, add 95 parts of TaCl 5 Stir until dissolved, slowly add NaOH while stirring to adjust the pH of the solution to 11, then add 3 parts of NiCl 2 , transfer the solution into an automatic hydrothermal reaction kettle, raise the temperature to 170°C, stir at a constant speed for 4 hours, cool the solution to room temperature, remove the solvent by filtration, wash the solid product with distilled water, and heat it to 80°C in a blast dryer Fully dried to obtain Ni-Ta precursor 1.

[0032] (2) Preparation of Ni 2+ Doping Ta 2 o 5 Compound 1: The Ni-Ta precursor 1 was placed in an atmosphere resistance furnace, and air and high-purity O 2 , the volume ratio of the two is 10:1, the heating rate of the atmosphere resistance furnace is 5 ℃ / min, rise to 750 ℃, heat preservation and calcination f...

Embodiment 2

[0037] (1) Preparation of Ni-Ta precursor 2: add an appropriate amount of absolute ethanol and distilled water as a mixed solvent into the reaction flask, the volume ratio of the two is 6:1, add 94 parts of TaCl 5 Stir until dissolved, slowly add NaOH while stirring to adjust the pH of the solution to 11, then add 3.5 parts of NiCl 2 , transfer the solution into an automatic hydrothermal reaction kettle, raise the temperature to 175°C, stir at a constant speed for 5 hours, cool the solution to room temperature, remove the solvent by filtration, wash the solid product with distilled water, and heat it to 85°C in a blast dryer Fully dried to obtain Ni-Ta precursor 2.

[0038] (2) Preparation of Ni 2+ Doping Ta 2 o 5 Compound 2: The Ni-Ta precursor 2 was placed in an atmosphere resistance furnace, and air and high-purity O 2 , the volume ratio of the two is 12:1, the heating rate of the atmosphere resistance furnace is 8°C / min, rise to 750°C, heat preservation and calcination...

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Abstract

The invention relates to the technical field of photocatalytic hydrogen production, and discloses a Co-modified Ni<2+> doped modified Ta3N5 photocatalytic hydrogen-producing material and a preparationmethod thereof. The hydrogen-producing material comprises the following formula raw materials: TaCl5, NiCl2, Co (OH) 2. The invention relates to a Co-modified Ni<2+> doped modified Ta3N5 photocatalytic hydrogen-producing material and a preparation method thereof, the doping of Ni<2+> can enhance the electronic conductivity of Ta3N5, the energy band structure and surface structure of Ta3N5 are optimized, the band gap energy of Ta3N5 is reduced, the ion defects produced by doping can capture the photogenerated carriers, the recombination efficiency of carriers is reduced, the photogenerated electrons and holes recombination is inhibited, surface ion defects can form more photocatalytic active sites, during the calcination process in ammonia atmosphere, metalloid nitrocobalt compounds are generated, which enhances the electron transport performance of Ta3N5 and promotes the separation and transport process of photo-generated carriers. At the same time, low valence nitrocobalt compounds can inhibit the autoxidation process of Ta3N5 and inhibit oxidation of N<3-> ions to N<2-> ions and avoid the decomposition of Ta3N5.

Description

technical field [0001] The technical field of photocatalytic hydrogen production of the present invention, specifically a Co-modified Ni 2+ Doped modified Ta 3 N 5 Photocatalytic hydrogen production material and its preparation method. Background technique [0002] With the increasing demand for energy and the seriousness of environmental pollution in countries around the world, the wide application of clean energy has become an inevitable trend. Renewable energy is a kind of energy whose raw materials can be regenerated, such as hydropower, wind power, solar energy, Material energy, geothermal energy and other energy; clean energy is an environmentally friendly energy, such as hydrogen energy, wind energy, etc., which has the advantages of less emission, less pollution and environmental protection; among them, hydrogen energy is a resource-rich, sustainable development , the most environmentally friendly energy, has the advantages of high combustion calorific value, good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24C01B3/04B01J35/39Y02E60/36
Inventor 彭正宽
Owner 彭正宽
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