Preparation method and application of carbon nitride-titanium dioxide heterojunction material for efficiently synthesizing ammonia through visible light

A technology of titanium dioxide and carbon nitride, which is applied in the field of nanomaterials and photocatalysis, can solve the problems of low utilization rate of photogenerated carriers, recombination of photogenerated electrons and holes, etc., to solve the problems of low charge utilization rate, poor adsorption capacity, Migration-promoting effect

Pending Publication Date: 2021-11-16
EAST CHINA UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

The biggest problem of carbon nitride as a photocatalyst is that its photogenerated electrons and holes recombine seriously, and the utilization rate of photogenerated carriers is low.

Method used

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  • Preparation method and application of carbon nitride-titanium dioxide heterojunction material for efficiently synthesizing ammonia through visible light
  • Preparation method and application of carbon nitride-titanium dioxide heterojunction material for efficiently synthesizing ammonia through visible light
  • Preparation method and application of carbon nitride-titanium dioxide heterojunction material for efficiently synthesizing ammonia through visible light

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Synthesis of Carbon Nitride Nanosheets

[0024] Put 2 g of urea evenly in the porcelain ark, place the porcelain ark in the air atmosphere of the muffle furnace and calcinate for 4 hours, the calcining temperature is 530°C, the heating rate is 2.3°C per minute, and the calcined product is ground into powder That is, carbon nitride nanosheets (CN) are obtained.

Embodiment 2

[0026] Synthesis of Carbon Nitride-TiO2 Heterojunction

[0027] 0.13 mL TiCl 4 Slowly add 7.5 mL of ethanol containing different amounts (100 mg, 300 mg, 500 mg) of CN dropwise, stir for 10 minutes, then add 0.8 mL of isopropyl titanate dropwise, and continue stirring for 2 hours to obtain a uniform solution. Place the above solution in a constant temperature and humidity box for 2 days at a temperature of 40°C and a humidity of 55%, then put it in a 70°C oven for aging for 1 day, and finally place it in a muffle furnace for calcination at 400°C for 8 hours, with a heating rate of 2°C / min, the obtained sample is a carbon nitride-titanium dioxide heterojunction (CN-TiO 2 ).

Embodiment 3

[0029] Synthesis of Carbon Nitride-TiO2 Heterojunction Rich in Oxygen Vacancies

[0030] The prepared carbon nitride-titanium dioxide heterojunction was placed in a tube furnace and calcined for 4 hours under an argon atmosphere. The calcination temperature was 300°C and the heating rate was 1°C / min. The obtained sample was rich in oxygen vacancies. The carbon nitride-titanium dioxide heterojunction (CN-OvTiO 2 ).

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Abstract

The invention provides a preparation method of a composite material with visible light ammonia synthesis performance. The material can be well applied to a visible light photocatalysis ammonia synthesis system. The preparation method comprises the following steps: synthesizing a carbon nitride (CN) material by taking urea as a precursor, taking titanium tetrachloride and isopropyl titanate as a titanium source, soaking a carbon nitride nanosheet in the titanium source, and then carrying out hydrolysis, aging, calcination and other steps to obtain the carbon nitride-titanium dioxide (CN-TiO2) heterojunction material. According to the method disclosed by the invention, the proportion of the two components in the heterojunction material can be simply controlled by controlling the amount of the added carbon nitride, and the concentration of oxygen vacancies in the heterojunction can be increased by calcining in an inert atmosphere. The prepared carbon nitride-titanium dioxide heterojunction (CN-OvTiO2) material rich in oxygen vacancies has relatively high visible light absorption efficiency, nitrogen capture capability and charge separation efficiency, and shows excellent photocatalytic synthesis ammonia activity and stability in a visible light pure water system.

Description

technical field [0001] The invention relates to a carbon nitride-titanium dioxide heterojunction material used for visible light synthesis of ammonia, and belongs to the field of nanometer materials and the field of photocatalysis technology. Background technique [0002] The development of photocatalysts for solar synthesis of ammonia has attracted extensive attention of chemists in recent years. Compared with industrial ammonia synthesis, photocatalytic nitrogen fixation ammonia synthesis is a green, environmentally friendly, non-toxic, and low-energy ammonia synthesis method. However, the efficiency of photocatalytic ammonia synthesis is still far below the requirements of practical applications, so it is necessary to develop efficient, stable, and inexpensive photocatalysts for ammonia synthesis. Among them, most of the solar spectrum is visible light. Therefore, the development of nitrogen-fixing photocatalysts with visible light response is the goal pursued by researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01C1/02
CPCB01J27/24B01J35/004B01J35/0013C01C1/026Y02P20/52
Inventor 张金龙吴仕群王灵芝岳文晖何承萱陈子钰潘礼汉
Owner EAST CHINA UNIV OF SCI & TECH
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