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S-P-doped g-C3N4 pipe-in-pipe and preparation method thereof

A g-c3n4, tube-in-tube technology, which is applied in the field of doped g-C3N4 preparation, can solve the problems of complex precursor pretreatment process and difficult removal of the template of the template method, and achieve great application value, uniform dispersion, and few types Effect

Active Publication Date: 2018-08-10
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For existing g-C 3 N 4 In the preparation process, the precursor pretreatment process is relatively complicated, and the template of the template method is difficult to remove. 3 N 4 Tube-in-tube provides a special preparation method with simple operation, good reproducibility, low cost, no need for any pretreatment of precursors, and no problem of template residue

Method used

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  • S-P-doped g-C3N4 pipe-in-pipe and preparation method thereof
  • S-P-doped g-C3N4 pipe-in-pipe and preparation method thereof
  • S-P-doped g-C3N4 pipe-in-pipe and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1.1 Mix 2.0g of melamine, 0.01g of ammonium dihydrogen phosphate and 0.01g of dibenzyl sulfide to obtain a uniform powder;

[0027] 1.2 Raise the mixture in step (1) to 650°C at a heating rate of 2°C / min, and calcinate at 650°C for 2 hours under an argon atmosphere;

[0028] 1.3 The calcined product is S, P doped g-C 3 N 4 Tube-in-tube product. figure 1 It is the SEM picture of the obtained product. It can be clearly seen from the figure that the product is a tube-in-tube structure formed by nesting inner tubes and outer tubes. The number of inner tubes is one or two, and the inner tube wall and the outer tube wall Partial contact, where the inner tube has an inner diameter of 100-200 nm and a wall thickness of 5-10 nm, the outer tube has an inner diameter of 300-800 nm and a wall thickness of 5-10 nm, and the length of the tube-in-tube is 2- 10 microns. Figure 4 and Figure 5 The XPS photos of the P2p orbital and S 2p orbital in the obtained product, respectively...

Embodiment 2

[0030] 2.1 Mix 2.0g of melamine, 0.005g of ammonium dihydrogen phosphate and 0.005g of dibenzyl sulfide to obtain a uniform powder;

[0031] 2.2 Raise the mixture in step (1) to 650°C at a heating rate of 2°C / min, and calcinate at 650°C for 2 hours under an argon atmosphere;

[0032] 2.3 The calcined product is g-C doped with S and P 3 N 4 Tube-in-tube product. The product is a tube-in-tube structure in which inner tubes and outer tubes are nested. The number of inner tubes is one or two, and the inner tube wall is partially in contact with the outer tube wall. The inner diameter of the inner tube is 50-100 nanometers , the wall thickness is 4-7 nanometers, the inner diameter of the outer tube is 200-600 nanometers, the wall thickness is 4-7 nanometers, and the length of the tube in the tube is 2-10 microns. After the BET test, the specific surface area of ​​the obtained product is 50 m 2 . g -1 .

Embodiment 3

[0034] 3.1 Mix 2.0g of melamine, 0.002g of ammonium dihydrogen phosphate and 0.002g of dibenzyl sulfide to obtain a uniform powder;

[0035] 3.2 Raise the mixture in step (1) to 650°C at a heating rate of 2°C / min, and calcinate at 650°C for 2 hours under an argon atmosphere;

[0036] 3.3 The calcined product is S, P doped g-C 3 N 4 Tube-in-tube product. The product is a tube-in-tube structure in which inner tubes and outer tubes are nested. The number of inner tubes is one or two, and the inner tube wall is partially in contact with the outer tube wall. The inner diameter of the inner tube is 10-50 nanometers , the wall thickness is 8-15 nanometers, the inner diameter of the outer tube is 300-900 nanometers, the wall thickness is 20-50 nanometers, and the length of the tube in the tube is 2-10 microns. After the BET test, the specific surface area of ​​the obtained product is 35 m 2 . g -1 .

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Abstract

The invention discloses an S-P-doped g-C3N4 pipe-in-pipe and a preparation method thereof. The preparation process comprises; mixing melamine, ammonium dihydrogen phosphate and dibenzyl sulfide to obtain a uniform mixture; and heating the mixture to a temperature of 550-700 DEG C, and calcining to obtain the product, wherein the obtained product has the special morphology of the pipe-in-pipe, andhas the component of S, P-doped g-C3N4. According to the present invention, the preparation process is simple and has good repeatability; and g-C3N4 has good stability, such that the prepared g-C3N4 pipe-in-pipe product has characteristics of controllable hollow degree and large specific surface area, and has great application values in the fields of microelectronics, catalysis, photocatalysis, electrocatalysis and the like.

Description

technical field [0001] The invention relates to an element doping method for preparing tubular g-C in a tube 3 N 4 The method belongs to doping g-C 3 N 4 Preparation technology field. Background technique [0002] Since 2009, Wang et al first discovered graphitic carbon nitride (g-C 3 N 4 ) can produce hydrogen under visible light, g-C 3 N 4 It has gradually become a research hotspot. The graphitic carbon nitride has good physical and chemical stability and can efficiently reduce water and carbon dioxide driven by visible light. g-C 3 N 4 by sp 2 Orbitally hybridized carbon and nitrogen atoms form a π-conjugated structure with a band gap of ~2.7 eV, corresponding to the visible light absorption wavelength of ~460 nm. It has been reported that pure g-C 3 N 4 The conduction band of is located at -1.23 eV (pH=7 NHE). Although g-C 3 N 4 is a good visible light-driven photocatalyst, but the bulk g-C 3 N 4 Due to the disadvantages of small specific surface area,...

Claims

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Application Information

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IPC IPC(8): C01B21/082B82Y40/00
CPCB82Y40/00C01B21/0605C01P2002/85C01P2004/03C01P2004/133C01P2006/12
Inventor 杨萍刘志国
Owner UNIV OF JINAN
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