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Preparation method of efficient photocatalyst nitrogen doped meso-porous niobium pentoxide

A technology of niobium pentoxide and photocatalyst, which is applied in the production of hydrogen, etc., can solve the problems of low sunlight utilization rate and low photon quantum yield, and achieve the effects of expanding the light response range, improving catalytic activity, and high recovery rate

Inactive Publication Date: 2013-05-08
NANTONG VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 The energy band gap is wide (about 3.2ev), and it needs to be irradiated by ultraviolet light to show photocatalytic activity, while ultraviolet light only accounts for about 6.5% of the total energy spectrum of sunlight, and the utilization rate of sunlight is low.
In addition, the recombination of photogenerated electrons and electron holes also leads to low photon quantum yield

Method used

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Examples

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Effect test

specific Embodiment 1

[0016] A method for preparing a nitrogen-doped mesoporous niobium pentoxide high-efficiency photocatalyst, comprising the following steps:

[0017] 1) Preparation of mesoporous niobium pentoxide, using m-Nb 2 o 5 To represent

[0018] a) Synthesis of m-Nb by self-assembly method 2 o 5

[0019] Weigh 0.1g of F127, dissolve it in 1.0g of absolute ethanol and treat it with a magnetic stirrer at a speed of 500-1000rpm for 10min. After the F127 is completely dissolved, add 0.1g of niobium pentachloride and stir vigorously for 20min. The color of the solution changes from light yellow to Become colorless and transparent, add 0.5mol / L CaCl dropwise 2 solution 0.5ml, and continue to stir for 10min to obtain Nb 2 o 5 Sol;

[0020] b) Nb 2 o 5 The sol was placed in a high-pressure reactor, aged at 60°C for 72 hours, dried at 40°C for 5 hours, put into a muffle furnace for heat treatment, and heated to 450°C at a rate of 5°C / min, kept for 5 hours and then naturally lowered to r...

specific Embodiment 2

[0023] A method for preparing a nitrogen-doped mesoporous niobium pentoxide high-efficiency photocatalyst, comprising the following steps:

[0024] a) Synthesis of m-Nb by self-assembly method 2 o 5

[0025] Weigh 2.0g of F127, dissolve it in 20.0g of absolute ethanol and treat it with a magnetic stirrer at a speed of 500rpm for 10min. After the F127 is completely dissolved, add 1.5g of niobium pentachloride and stir vigorously for 20min. The color of the solution changes from light yellow to Colorless and transparent, add 0.5mol / L CaCl drop by drop 2 solution 1.0ml, and continue stirring for 10min to obtain Nb 2 o 5 Sol;

[0026] b) Nb 2 o 5 The sol was placed in a high-pressure reactor, aged at 60°C for 72 hours, dried at 40°C for 5 hours, put into a muffle furnace for heat treatment, and heated to 450°C at a rate of 5°C / min, kept for 5 hours and then naturally lowered to room temperature , making m-Nb 2 o 5 product;

[0027] 2) Preparation of nitrogen-doped mesop...

specific Embodiment 3

[0029] A method for preparing a nitrogen-doped mesoporous niobium pentoxide high-efficiency photocatalyst, comprising the following steps:

[0030] 1) Preparation of mesoporous niobium pentoxide, using m-Nb 2 o 5 To represent

[0031] a) Synthesis of m-Nb by self-assembly method 2 o 5

[0032]Weigh 1.0g of F127 and dissolve it in 10.0g of absolute ethanol and treat it with a magnetic stirrer at a speed of 1000rpm for 10min. After the F127 is completely dissolved, add 1.0g of niobium pentachloride and stir vigorously for 20min. The color of the solution changes from light yellow to Colorless and transparent, add 0.5mol / L CaCl drop by drop 2 solution 0.5ml, and continue to stir for 10min to obtain Nb 2 o 5 Sol;

[0033] b) Nb 2 o 5 The sol was placed in a high-pressure reactor, aged at 60°C for 72 hours, dried at 40°C for 5 hours, put into a muffle furnace for heat treatment, and heated to 450°C at a rate of 5°C / min, kept for 5 hours and then naturally lowered to room ...

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Abstract

The invention discloses a preparation method of an efficient photocatalyst nitrogen doped meso-porous niobium pentoxide. The preparation method comprises a step of the preparation of meso-porous niobium pentoxide and a step of the preparation of nitrogen doped meso-porous niobium pentoxide. The preparation method can effectively develop the light response range of a niobium pentoxide photocatalyst, substantially enhance the catalytic activity of a photocatalyst under the condition of the sunlight, and further enlarge the application field of the niobium pentoxide photocatalyst. The efficient photocatalyst nitrogen doped meso-porous niobium pentoxide has the characteristics of rapid and effective decomposition of water, high recovery rate and no secondary pollution, and is an environmentally-friendly photocatalyst.

Description

technical field [0001] The invention relates to the field of semiconductor photocatalyst preparation, in particular to a method for preparing a nitrogen-doped mesoporous niobium pentoxide high-efficiency photocatalyst capable of decomposing water. Background technique [0002] Hydrogen energy is a green and non-polluting energy. It is a new generation of energy that is widely used after non-renewable energy such as coal, oil, and natural gas. It has the advantages of cleanness, high energy storage, abundant sources, and high use efficiency. Therefore, human society urgently needs to find a hydrogen production technology that can realize industrial production. [0003] Photocatalytic water splitting is an emerging technology that uses photocatalytic materials to absorb solar energy, convert solar energy into chemical energy, and then use it to split water to produce hydrogen. Its advantages are: (1) utilize cheap, abundant and clean solar energy. (2) Directly convert solar ...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/06
CPCY02E60/36
Inventor 黄徽何晓春王成刘瑞霞严进孙强
Owner NANTONG VOCATIONAL COLLEGE
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