Carbon nitride for photocatalysis of sea water to separate out hydrogen and preparation method of carbon nitride

A carbon nitride and photocatalytic technology, applied in the field of carbon nitride, can solve the problems of enhancing photocatalytic performance, difficulty and so on

Pending Publication Date: 2019-08-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is precisely the excellent physicochemical stability of carbon nitride that makes it difficult to enhance its photocatalytic performance through surface modification.

Method used

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  • Carbon nitride for photocatalysis of sea water to separate out hydrogen and preparation method of carbon nitride
  • Carbon nitride for photocatalysis of sea water to separate out hydrogen and preparation method of carbon nitride
  • Carbon nitride for photocatalysis of sea water to separate out hydrogen and preparation method of carbon nitride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 500mg CN was placed in a mortar, and a total of 0.2mL deionized water was added dropwise several times during the grinding process. After fully grinding, add 1000mg KI and grind again, and finally stack it in a corundum boat, place it in a tube furnace, and heat it to 550°C at a heating rate of 5°C / min in a nitrogen atmosphere and keep it for 2h. After the obtained samples were naturally cooled to room temperature, they were ultrasonically stirred and dispersed in deionized water. Finally, it was centrifuged and washed three times with deionized water, and dried overnight in an oven at 60°C. The dried samples were fully ground and collected for later use. The sample is named KI-CN. The same reaction conditions as in Example 1 were used for hydrogen evolution in photocatalytic deionized water, simulated seawater, Yellow Sea, and South China Sea seawater, and the 4h hydrogen evolution amounts were 11.73, 13.5, 26.27, and 28.23 μmol, respectively.

Embodiment 2

[0024] 500mg CN was placed in a mortar, and a total of 0.2mL deionized water was added dropwise several times during the grinding process. After fully grinding, add 1000mg RbI and grind again, and finally stack it in a corundum boat, place it in a tube furnace, and heat it to 550°C at a heating rate of 5°C / min in a nitrogen atmosphere and keep it for 2h. After the obtained samples were naturally cooled to room temperature, they were ultrasonically stirred and dispersed in deionized water. Finally, it was centrifuged and washed three times with deionized water, and dried overnight in an oven at 60°C. The dried samples were fully ground and collected for later use. The sample was named RbI-CN. The same reaction conditions as in Example 1 were used for hydrogen evolution in photocatalytic deionized water, simulated seawater, Yellow Sea, and South China Sea seawater, and the 4h hydrogen evolution amounts were 12.84, 20.27, 34.91, and 34.02 μmol, respectively.

Embodiment 3

[0026] 500mg CN was placed in a mortar, and a total of 0.2mL deionized water was added dropwise several times during the grinding process. After fully grinding, add 1000mg of CsI and grind again, and finally stack it in a corundum boat, place it in a tube furnace, and heat it to 550°C at a heating rate of 5°C / min in a nitrogen atmosphere and keep it for 2h. After the obtained samples were naturally cooled to room temperature, they were ultrasonically stirred and dispersed in deionized water. Finally, it was centrifuged and washed three times with deionized water, and dried overnight in an oven at 60°C. The dried samples were fully ground and collected for later use. The sample is named CsI-CN. The same reaction conditions as in Example 1 were used for hydrogen evolution in photocatalytic deionized water, simulated seawater, Yellow Sea, and South China Sea seawater, and the 4h hydrogen evolution amounts were 7.9, 33.62, 46.38, and 43.21 μmol, respectively.

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Abstract

By calcining a series of alkali metal salt (KI, RbI, CsI, CsBr and CsCl), bulk phase g-C3N4 and trace deionized water as raw materials in a nitrogen atmosphere at 550 DEG C, carbon nitride is modified. The carbon nitride of the modified carbon nitride can be observed. By introducing water, the surface of the carbon nitride contains more hydroxyl, so that the hydrophilic performance of the materialis improved. In the modifying process, alkali metal cations are coordinated to carbon nitride to further affect charge distribution on the surface of the carbon nitride, so that separation of photo-induced electrons and cavities is achieved. The carbon nitride is finally applied to photocatalysis of sea water to separate out hydrogen. Compared with an effect of the bulk phase carbon nitride in deionized water, the hydrogen separation out effect of the modified carbon nitride in seawater is improved by 257.7 times. In addition, the hydrogen separation out stability is obviously improved. Accompanying drawing: a transmission electron microscope (TEM) of the CsI modified carbon nitride.

Description

technical field [0001] The invention relates to a carbon nitride that can be used for photocatalytic hydrogen precipitation in seawater and a preparation method thereof, belonging to the technical field of carbon nitride. Background technique [0002] Graphite carbon nitride (g-C 3 N 4 ), as an organic semiconductor catalyst, has been favored by researchers for its excellent physical and chemical stability, moderate band gap (about 2.7eV) and wide range of photocatalytic applications. However, it is precisely the excellent physicochemical stability of carbon nitride that makes it difficult to enhance its photocatalytic performance through surface modification. The halide anion of the alkali metal halide salt can easily take away the amino groups on the surface of carbon nitride, so that it has the potential to modify the surface of carbon nitride. Here, we modified carbon nitride under the condition of alkali metal halide salt, on the one hand, adjusted the lattice struct...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277B01J35/39Y02E60/36
Inventor 吴文婷赵雪东徐文明吴明铂李忠涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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