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Surface-hydroxylated nano-pore carbon nitride photocatalytic material as well as preparation method and application thereof

A technology for hydroxylation of nanoporous carbon nitride photocatalytic materials, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., to achieve the effects of facilitating photodegradation, increasing crystallinity, and increasing specific surface area

Inactive Publication Date: 2015-07-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides a surface hydroxylated nanoporous carbon nitride photocatalytic material and its preparation method and application, which solves the problem of the low performance of existing organic photocatalytic materials in degrading gaseous organic pollutants and their preparation The process is complex, not environmentally friendly, and it is difficult to achieve industrialization and other difficulties

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  • Surface-hydroxylated nano-pore carbon nitride photocatalytic material as well as preparation method and application thereof
  • Surface-hydroxylated nano-pore carbon nitride photocatalytic material as well as preparation method and application thereof
  • Surface-hydroxylated nano-pore carbon nitride photocatalytic material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of surface hydroxylated nanoporous carbon nitride: Weigh 1.5g of melamine, 7.5g of potassium chloride, and 0.1g of sodium hydroxide, grind the mixed powder in a mortar for 10-30min, mix well, and place in a crucible. Seal the mouth of the crucible with aluminum foil, place it in a muffle furnace and heat it up to 550°C and keep it warm for 4 hours. The sintered powder is ground with a mortar, separated by suction filtration with deionized water, and dried at 80°C for 4 hours to obtain Yellow nanoporous carbon nitride.

[0032] Some structural studies were performed on the nanoporous carbon nitride product (labeled C3N4-KCl / 0.1 g NaOH) prepared by the above method. figure 1 Be the XRD figure of nanoporous carbon nitride material, the product that illustrates preparation is carbon nitride; BET analysis ( figure 2 ) shows that carbon nitride has about 69m 2 / g specific surface area, the nanopore size is mainly distributed around 7nm; scanning electron micros...

Embodiment 2

[0034] The influence of sintering temperature and holding time on the product: weigh twelve parts of 1.5g of melamine, 7.5g of potassium chloride and 0.1g of sodium hydroxide, and grind the mixed powder in a mortar for 10 to 30 minutes. In the crucible, seal the mouth of the crucible with aluminum foil, place it in a muffle furnace and raise the temperature to 400°C, 500°C, 550°C, and 600°C respectively, and keep warm at each temperature for 2h, 3h, and 4h respectively. After sintering The powder was ground with a mortar, washed with deionized water and separated by suction filtration. The separated sample was dried at 80°C for 4 hours to obtain a yellow nanoporous carbon nitride. Through the comparison and analysis of the test results of the products in this case, it can be seen that with the increase of the holding temperature and holding time, the yield is getting lower and lower. Merit.

Embodiment 3

[0036]The impact of the amount of alkali metal chloride on the product: Weigh four parts of 1.5g of melamine and 0.1g of sodium hydroxide, then add 0.15g, 1.5g, 7.5g, and 30g of potassium chloride to the four samples, and mix the raw materials Grind in a mortar for 10 to 30 minutes, mix well, place in a crucible, seal the mouth of the crucible with aluminum foil, put it in a muffle furnace to raise the temperature to 550°C and keep it warm for 4 hours, and use a mortar to sinter the powder Grind, wash with deionized water, and separate by suction filtration. The separated sample is dried at 80° C. for 4 hours to obtain yellow nanoporous carbon nitride. Through the analysis of the test results of the product of this case, it can be known that the crystallinity and specific surface area of ​​the product show a trend of rising first and then decreasing with the increase of the amount of alkali metal chloride. When the consumption of potassium chloride was 7.5g, the specific surfac...

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Abstract

The invention discloses a surface-hydroxylated nano-pore carbon nitride photocatalytic material as well as a preparation method and an application thereof. A nano-pore structure of the photocatalytic material mainly comprises mesopores with diameters of 5-30 nm and comprises micropores with diameters smaller than 2 nm, the specific surface area is 10-90 m<2> / g, and a hydroxyl group is grafted on the surface; during preparation, melamine, alkali chloride and alkali containing alkali metal or alkaline-earth metal elements are taken as raw materials and treated in an electric furnace at the temperature of 400 DEG C-600 DEG C for certain time, a product is subjected to washing, extraction filtration and separation, the yellow nano-pore carbon nitride photocatalytic material is obtained, and the alkali chloride in a washing solution is recovered. With adoption of the method, a little alkali is taken as a pore forming material, meanwhile, a catalyst forms a hydroxylation surface, no template agent and surfactant are required, the cost is reduced, the problems of complicated preparation process, non-environmental protection and low probability of industrialization promotion in the prior art are solved, and the product has excellent capability of photocatalytic degradation on gas-phase pollutants.

Description

technical field [0001] The invention relates to a nanoporous photocatalytic material and its preparation method and application, in particular to a method for preparing a nanoporous carbon nitride photocatalytic material with good crystallinity and surface hydroxylation under alkaline conditions and a method for degrading the gas phase Pollutant applications. Background technique [0002] The rapid development of modern industry has greatly improved people's living standards, and at the same time made human beings face environmental crisis and energy crisis. As a new research field, photocatalysis is expected to solve environmental pollution and energy shortage problems at the same time. Polymer semiconductor carbon nitride, due to its cheap, stable, metal-free visible light photocatalytic material, is widely used in photocatalytic conversion of solar energy, such as photolysis of water, degradation of liquid organic pollutants, CO 2 In terms of photoreduction, it has a goo...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01D53/86B01D53/72
Inventor 李云祥欧阳述昕叶金花胡慧林
Owner TIANJIN UNIV
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