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Preparation and application of nitrogen vacancy-modified oxygen-rich titanium dioxide nano composite material

A titanium dioxide, composite material technology, applied in the directions of carbon monoxide, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as low yield

Active Publication Date: 2018-10-26
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a nitrogen-vacancy modified oxygen-rich titanium dioxide nanocomposite (CNNA-OTiO 2 ) method of preparation;

Method used

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  • Preparation and application of nitrogen vacancy-modified oxygen-rich titanium dioxide nano composite material
  • Preparation and application of nitrogen vacancy-modified oxygen-rich titanium dioxide nano composite material
  • Preparation and application of nitrogen vacancy-modified oxygen-rich titanium dioxide nano composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Preparation of CNNA: Add 7.5g of melamine to 50ml of deionized water under magnetic stirring, and keep the system stirring at 50°C for 1h; add 2ml of nitric acid until a white solid precipitates, and heat to 100°C to evaporate water; finally, the white The solid material was put into a muffle furnace, heated to 550°C at a rate of 5°C / min, and calcined for 3 hours to obtain CNNA (g-C 3 N 4 );

[0032] (2) Synthesis of peroxotitanate complex: slowly add 3mL TBOT into 50mL cold water (5°C), immediately produce white precipitate; after repeated washing with deionized water, add the precipitate under magnetic stirring to 50ml deionized water and 25ml H 2 o 2 In the mixed solution, keep the temperature at 5°C and stir for 1 hour to obtain the orange peroxotitanate complex O 2 -TiO 2 ;

[0033] (3) CNNA(1%)-OTiO 2 Preparation of: Add 0.07 g of CNNA to the above orange peroxotitanate complex O 2 -TiO 2 , heated to 50°C for 4 hours; the reaction solution was dried o...

Embodiment 2

[0036] (1) Preparation of CNNA: Same as Example 1;

[0037] (2) Preparation of peroxotitanate complex: slowly add 3mL TBOT into 50mL cold water (5°C), and immediately produce a white precipitate; after repeated washing of the precipitate with deionized water, add the precipitate under magnetic stirring to 50ml deionized water and 50ml H 2 o 2 In the mixed solution, keep the temperature at 5°C and stir for 1 hour to obtain the orange peroxotitanate complex O 2 -TiO 2 ;

[0038] (3) CNNA(5%)-OTiO 2 Synthesis of: take 0.35g CNNA, add orange peroxotitanate complex O 2 -TiO 2 , heated to 50°C for 4 hours; the reaction solution was dried overnight in an air oven at 100°C to obtain a yellow solid substance CNNA(5%)-OTiO 2 ;

[0039] (4) Photocatalytic reduction performance: CNNA(5%)-OTiO 2 As a catalyst, under the irradiation of 300W xenon lamp, the amount of carbon monoxide produced can reach 12μmol / g.

Embodiment 3

[0041] (1) Preparation of CNNA: Same as Example 1;

[0042] (2) Preparation of peroxotitanate complex: Take 3 mL of TBOT and slowly add it to 50 mL of cold water (5°C), and immediately produce a white precipitate; after repeated washing of the precipitate with deionized water, dissolve the precipitate under magnetic stirring Add to 50ml deionized water and 35mlH 2 o 2 In the mixed solution, keep the temperature at 5°C and stir for 1 hour to obtain the orange peroxotitanate complex O 2 -TiO 2 ;

[0043] (3) CNNA(10%)-OTiO 2 Synthesis of: take 0.7g CNNA, add orange peroxotitanate complex O 2 -TiO 2 , heated to 50°C for 4 hours; the reaction solution was dried overnight in an air oven at 100°C to obtain a yellow solid substance CNNA(10%)-OTiO 2 ;

[0044] (4) Photocatalytic reduction performance: CNNA(10%)-OTiO 2 As a catalyst, under the irradiation of 300W xenon lamp, the amount of carbon monoxide produced can reach 11μmol / g.

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Abstract

The invention discloses a preparation method of a nitrogen vacancy g-C3N4 modified oxygen-rich titanium dioxide nano composite material. The preparation method comprises the steps of precipitating tetrabutyl titanate with cold water of 0-5 DEG C, washing repeatedly with deionized water, then adding the product into a mixed solution of deionized water and hydrogen peroxide under magnetic stirring,keeping the system at 0-5 DEG C and stirring for 0.5-1 hour, so as to obtain an orange peroxytitante complex, adding g-C3N4 into the orange peroxytitante complex, heating up to 40-50 DEG C and reacting for 3-4 hours, so as to obtain the CNNA modified oxygen-rich titanium dioxide composite material CNNA-OTiO2. Photocatalytic reduction performance experiments show that CNNA-OTiO2 has better catalytic activity in the reaction of photocatalytic reduction of carbon dioxide, so that the CNNA-OTiO2 has a good application prospect in the reaction of photocatalytic reduction of carbon dioxide.

Description

technical field [0001] The invention relates to a nitrogen vacancy g-C 3 N 4 (CNNA) modified oxygen-rich titanium dioxide (CNNA-OTiO 2 ) preparation method, mainly used in the photocatalytic reduction of carbon dioxide reaction. Background technique [0002] Since entering the 21st century, with the rapid development of industry and the rapid growth of population, human beings are facing two important problems of energy shortage and environmental pollution. Therefore, it is imminent to develop efficient green technologies that can be used for environmental governance and energy regeneration. Semiconductor photocatalysis technology can convert the inexhaustible solar energy into chemical energy and use it for people to meet people's needs for environmental and energy issues, so it is known as the most promising future technology. In recent years, using semiconductors as catalyst materials, CO 2 Technologies for conversion to hydrocarbons are in the spotlight. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B32/40
CPCC01B32/40B01J27/24B01J35/39
Inventor 佘厚德周华王龙龙李良善
Owner NORTHWEST NORMAL UNIVERSITY
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