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Preparation method, product and application of mesoporous graphite-phase carbon nitride composed of hollow spheres

A technology of graphite phase carbon nitride and carbon nitride, which is applied in the direction of chemical instruments and methods, nitrogen compounds, nitrogen and non-metallic compounds, etc., can solve the problems of complex preparation process, increase the specific surface area and improve the utilization rate , low-cost effect

Inactive Publication Date: 2019-02-12
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For traditional mesoporous g-C 3 N 4 The problem of complex preparation process, the purpose of the present invention is to provide a method for preparing mesoporous graphite phase carbon nitride composed of hollow spheres

Method used

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  • Preparation method, product and application of mesoporous graphite-phase carbon nitride composed of hollow spheres
  • Preparation method, product and application of mesoporous graphite-phase carbon nitride composed of hollow spheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) A cylinder with a height of 4 cm and a diameter of 3 cm at the bottom is placed in the center of a 300 ml crucible to form two separated raw material placement spaces at the bottom of the crucible and the top of the cylinder;

[0026] (2) Weighing 0.2g of a 20nm-diameter silica template evenly placed on the top of the cylinder, weighing 2g of melamine evenly placed on the bottom of the crucible, and cover the crucible lid;

[0027] (3) Place the crucible in a muffle furnace and calcinate at 550°C for 4h with a heating rate of 4°C / min;

[0028] (4) The obtained yellow product was treated with 4M NH 4 HF 2 24 hours of processing;

[0029] (5) The product in (4) was washed three times with deionized water and absolute ethanol, and then vacuum-dried at 80° C. for 12 h. The obtained yellow product was mesoporous carbon nitride composed of hollow spheres.

Embodiment 2

[0031] (1) A cylinder with a height of 4 cm and a diameter of 3 cm at the bottom is placed in the center of a 300 ml crucible to form two separated raw material placement spaces at the bottom of the crucible and the top of the cylinder;

[0032] (2) Weighing 0.2g of silica template with a diameter of 20nm is evenly placed on the top of the cylinder, weighing 2g of urea is evenly placed on the bottom of the crucible, and the crucible lid is covered;

[0033] (3) Place the crucible in a muffle furnace and calcinate at 520°C for 4h with a heating rate of 4°C / min;

[0034] (4) The obtained yellow product was treated with 4M NH 4 HF 2 Processing for 24 hours;

[0035] (5) The product in (4) was washed three times with deionized water and absolute ethanol, and then vacuum-dried at 80° C. for 12 h. The obtained yellow product was mesoporous carbon nitride composed of hollow spheres.

Embodiment 3

[0037] (1) A cylinder with a height of 4 cm and a diameter of 3 cm at the bottom is placed in the center of a 300 ml crucible to form two separated raw material placement spaces at the bottom of the crucible and the top of the cylinder;

[0038] (2) The silica template weighing 0.2g of diameter 20nm is evenly placed on the top of the cylinder, the cyanamide weighing 2g is evenly placed on the bottom of the crucible, and the crucible lid is covered;

[0039] (3) Place the crucible in a muffle furnace and calcinate at 550°C for 4h with a heating rate of 4°C / min;

[0040] (4) The obtained yellow product was treated with 4M NH 4 HF 2 Processing for 24 hours;

[0041] (5) The product in (4) was washed three times with deionized water and absolute ethanol, and then vacuum-dried at 80° C. for 12 h. The obtained yellow product was mesoporous carbon nitride composed of hollow spheres.

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Abstract

The invention discloses a preparation method of mesoporous graphite-phase carbon nitride composed of hollow spheres. A carbon nitride precursor is separated from a silicon dioxide template by utilizing a high-capacity crucible and a suitable cylinder, and afterwards, are combined by utilizing a method of vapor deposition, and the morphology of a final product is controlled through controlling theuse levels of a template agent and the precursor; secondly, the precursor is polymerized on the template through a method of high-temperature calcination, and next, the template is removed by using acorrosive agent; finally, washing is carried out by using deionized water and absolute ethyl alcohol and then drying is carried out in vacuum, so that the mesoporous graphite-phase carbon nitride g-C3N4 composed of the hollow spheres is obtained. The method provided by the invention is simple to operate and low in cost; moreover, the finally obtained carbon nitride is good in mesoporosity; furthermore, not only the specific surface area of the g-C3N4 is increased but also the reflection times of light in the g-C3N4 is increased by the morphology of the hollow spheres; and the utilization rateof the mesoporous graphite-phase carbon nitride to the light is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of photocatalytic materials, and in particular relates to a preparation method of mesoporous carbon nitride composed of hollow spheres and its product and application. Background technique [0002] Graphite carbon nitride (g-C 3 N 4 ), as a two-dimensional semiconductor material with a graphene-like structure, has shown great application prospects in photocatalytic hydrogen production from water, photocatalytic organic synthesis, and photocatalytic pollutant degradation. Regular bulk g-C 3 N 4 Although it has a certain photocatalytic ability, its application in the field of photocatalysis is severely restricted due to its shortcomings such as small specific surface area, wide band gap, and easy recombination of photogenerated electrons and carriers. [0003] It has been shown in the literature that the bulk g-C 3 N 4 Mesoporous g-C 3 N 4 Can greatly improve g-C 3 N 4 The specific sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/082B01J27/24
CPCC01B21/0605B01J27/24C01P2004/34C01P2004/03C01P2002/72B01J35/39
Inventor 何丹农王敬锋郭继鹏唐启航林琳金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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