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A three-dimensional macroscopic porous graphite phase carbon nitride photocatalyst and its preparation and application

A phase carbon nitride light, porous graphite technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of hindering the application of powder catalysts and restricting graphite phase carbon nitride powder catalysts Application prospects, low reuse rate, etc., to achieve good controllability, large specific surface area and visible light absorption performance, and low cost.

Active Publication Date: 2017-04-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high-cost filtration technology and complicated and time-consuming separation process will greatly hinder the application of powder catalysts. In addition, there is a large loss in the separation process of powder graphite phase carbon nitride, and the reuse rate is low, which also limits Application Prospect of Graphite Phase Carbon Nitride Powder Catalyst in Air Purification in the Future

Method used

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  • A three-dimensional macroscopic porous graphite phase carbon nitride photocatalyst and its preparation and application
  • A three-dimensional macroscopic porous graphite phase carbon nitride photocatalyst and its preparation and application
  • A three-dimensional macroscopic porous graphite phase carbon nitride photocatalyst and its preparation and application

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Effect test

Embodiment 1

[0027] Soak a cuboid melamine sponge with a mass of ~100mg and a size of approximately 4cm×1.5cm×1.5cm in 30mL of 0.5g mL -1 In the urea aqueous solution, the mass ratio of immersion is about 1:150. After 10min, the saturated sponge is taken out, and after freeze-drying, the melamine sponge loaded with urea is dried in N 2 Calcined at 550°C for 4h and cooled to room temperature, a three-dimensional macroscopic porous graphite phase carbon nitride catalyst was prepared. X-ray powder diffraction (XRD) characterization proves that this material is the carbon nitride of graphitic phase, see figure 1 shown. Scanning (SEM) and transmission electron microscopy (TEM) can observe the obvious porous structure, see figure 2 and 3 shown. N 2 The adsorption test also proves that it has an obvious stacked pore structure, and its specific surface area is calculated by BET method to be 78m 2 g -1 ,See Figure 4 shown. The ultraviolet-visible absorption spectrum proves that the three...

Embodiment 2

[0029] Soak a cuboid melamine sponge with a mass of ~100mg and a size of approximately 4cm×1.5cm×1.5cm in 30mL of 0.1g mL -1 In the melamine aqueous solution, the mass ratio of immersion is about 1:30, after 10min, take out the absorbent saturated sponge, after freeze-drying, dry the melamine sponge loaded with melamine in N 2 Calcined at 600°C for 1 h, cooled to room temperature, and a three-dimensional macroscopic porous graphite carbon nitride catalyst was prepared. The specific surface is about 40m 2 g -1 , the absorption sideband is about 700nm.

Embodiment 3

[0031] Soak a cuboid melamine sponge with a mass of ~100mg and a size of about 4cm×1.5cm×1.5cm in 30mL 0.3g mL -1 In the aqueous solution of thiourea, the mass ratio of immersion is about 1:90. After 10min, the saturated sponge is taken out. After freeze-drying, the melamine sponge loaded with thiourea is dried in N 2 Calcined at 500°C for 2 hours and cooled to room temperature, a three-dimensional macroscopic porous graphite carbon nitride catalyst was prepared. The specific surface is about 55m 2 g -1 , the absorption sideband is about 700nm.

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Abstract

The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a preparation method and application of three-dimensional macro-scale porous graphite phase carbon nitride. The synthesis of the three-dimensional macro-scale porous graphite phase carbon nitride comprises the following steps: sufficiently dipping a bulk commercial melamine sponge in aqueous solutions of carbon-nitrogen containing precursors, such as urea, thiourea, cyanamide, carrying out freeze-drying, and thermally polymerizing to obtain the three-dimensional macro-scale porous graphite phase carbon nitride. The three-dimensional macro-scale porous graphite phase carbon nitride prepared by the preparation method disclosed by the invention has a three-dimensional macro-porous structure, and shows the special three-dimensional macro-porous structure, has larger specific surface area and photo-absorption and better mechanical property, and has good photocatalysis hydrogen production property and photo-degradation organic pollutant property under visible light in comparison with the traditional powdery graphite phase carbon nitride. The three-dimensional macro-scale porous graphite phase carbon nitride catalyst is prepared by using the method, the preparation process is optimized, the method is economic, simple, and capable of producing in large scale, and has important application prospect.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a three-dimensional macroscopic porous graphite phase carbon nitride photocatalyst and its preparation and application. Background technique [0002] In recent years, problems such as environmental pollution and energy shortage have become increasingly serious. Photocatalytic technology can convert low-density solar energy into chemical energy, such as photocatalytic water production of hydrogen, pollutant degradation, organic oxidation and reduction, and air purification (typical literature : Chem.Rev.2010,110,6503; Chem.Rev.1995,95,69; Chem.Soc.Rev.2013,42,2568; Chem.Soc.Rev.2014,43,7787), so photocatalytic technology It is considered to be an ideal way to solve problems such as environmental pollution and energy shortage, showing great application prospects. [0003] Catalyst is the core of photocatalytic technology. At present, hun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C01B3/04C02F1/30
CPCY02E60/36
Inventor 黄正宏梁庆华杨全红
Owner TSINGHUA UNIV
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