Photocatalyst as well as preparation method and application thereof

A photocatalyst and protonization technology, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve problems such as poor photocatalytic performance, achieve simple operation, reduce recombination centers, and improve interfacial transfer effects

Active Publication Date: 2022-04-12
SHENZHEN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the g-C of amorphous or semi-crystalline structure in the prior art 3 N 4 The defect of poor photocatalytic performance, thereby providing a kind of photocatalyst and its preparation method and application

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  • Photocatalyst as well as preparation method and application thereof
  • Photocatalyst as well as preparation method and application thereof
  • Photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] This embodiment relates to a photocatalyst, such as figure 1 As shown, it is prepared according to the following steps:

[0073] S1, BCN (block g-C 3 N 4 ) preparation:

[0074] 5 g of melamine was calcined at 500° C. for 4 hours at a heating rate of 10° C. / min under an air atmosphere in a muffle furnace to obtain a pale yellow product BCN.

[0075] S2, PCN (protonated crystal g-C 3 N 4 ) preparation:

[0076] The product BCN obtained in step S1 was ground to obtain powder A; 1 g of powder A was thoroughly ground in a glove box with 5.5 g KCl and 4.5 g LiCl, and then the mixture was heated to 550 ° C in a tube furnace under a nitrogen atmosphere and kept for 4 hours, to obtain mixture B; the cooled mixture B was washed with a large amount of boiling deionized water to the neutrality of the supernatant, filtered and centrifuged and then vacuum-dried at 80°C to obtain CCN (crystalline carbon nitride); 100 mg of CCN was ultrasonically dispersed in 50 ml of PH=2 hydr...

Embodiment 2

[0097] This embodiment relates to a kind of photocatalyst, and the difference between this embodiment and Embodiment 1 is that, in this embodiment, S4, MACPC (acidic carbon nanofiber / protonated crystallization g-C 3 N 4 Photocatalyst) preparation comprises the following steps:

[0098] Sonicate 5 mg of acidic carbon nanofibers in 2 mL of deionized water for 3 min to form a black suspension D; transfer 80 μl of suspension D to the protonated crystalline carbon nitride solution and continue to sonicate for 10 min to obtain a mixture E; Mixture E was transferred to a 35 ml quartz container and treated in a microwave instrument with a power of 50 W at 120 °C for 20 minutes to obtain product F; product F was washed several times with deionized water and then dried under vacuum at 80 °C , get MACPC. The acidic carbon nanofiber content in the obtained MACPC is 0.5%.

Embodiment 3

[0100] This embodiment relates to a kind of photocatalyst, and the difference between this embodiment and Embodiment 1 is that, in this embodiment, S4, MACPC (acidic carbon nanofiber / protonated crystallization g-C 3 N 4 Photocatalyst) preparation comprises the following steps:

[0101] Sonicate 8 mg of acidic carbon nanofibers in 2 mL of deionized water for 3 min to form a black suspension D; transfer 80 μl of suspension D to the protonated crystalline carbon nitride solution and continue sonication for 10 min to obtain a mixture E; Mixture E was transferred to a 35 ml quartz container and treated in a microwave instrument with a power of 50 W at 120 °C for 20 minutes to obtain product F; product F was washed several times with deionized water and then dried under vacuum at 80 °C , get MACPC. The acidic carbon nanofiber content in the obtained MACPC is 2%.

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Abstract

The invention relates to the field of catalysts, in particular to a photocatalyst and a preparation method and application thereof. The photocatalyst is formed by loading protonated crystal g-C3N4 on acidified carbon nanofibers in an electrostatic self-assembly manner, and the loading capacity of the acidified carbon nanofibers is 0.5-5%. The protonated crystal g-C3N4 can effectively reduce the recombination center of carriers, improve the interface transfer of charges and increase active sites of reaction, the acidified carbon nanofibers can improve the transfer of the carriers and can effectively avoid agglomeration of the one-dimensional nanorod structure of the crystal g-C3N4, and under light illumination, the one-dimensional nanorod structure of the crystal g-C3N4 can be converted into the one-dimensional nanorod structure of the crystal g-C3N4. Electrons and electron hole pairs excited from a valence band to a conduction band are firstly generated in g-C3N4, and the electrons can be transferred from the g-C3N4 to the carbon fiber and stored due to excellent conductivity and charge storage capability of the carbon fiber, so that the catalyst has relatively high catalytic activity.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a photocatalyst and its preparation method and application. Background technique [0002] With the increasing consumption of global fossil energy and environmental pollution, it is imperative to develop a renewable energy system that does not rely on fossil energy and reduce greenhouse gas emissions and water pollution. [0003] As a new type of clean and renewable energy, hydrogen energy has broad application prospects. The use of solar light decomposition to prepare hydrogen is a low-cost, simple, feasible and highly potential way, the core of which is to develop high-efficiency photocatalysts. [0004] It was found that graphitic carbon nitride (g-C 3 N 4 ) to heptazine ring (C 6 N 7 ) is constructed as a basic structural unit, has high chemical stability, strong visible light absorption and non-toxicity, and can be used as a photocatalyst. However, g-C with amorphous or semi-cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/22
CPCY02E60/36
Inventor 周双温达苏耀荣韩培刚何斌孟爱云
Owner SHENZHEN TECH UNIV
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