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Synthesis and application of graphite phase carbon nitride-ammonium tungsten bronze composite photocatalyst

A graphite phase carbon nitride and phase carbon nitride technology, which is applied in the direction of physical/chemical process catalysts, optics, optical components, etc., can solve the problems of complex preparation process and unfavorable large-scale application, and achieve simple operation and improved photocatalysis Activity, effect of promoting mutual transfer

Pending Publication Date: 2020-02-18
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent "A New Multifunctional Film" (ZL201610058215.8) discloses a titanium dioxide multifunctional film modified on the surface of tungsten bronze potassium / fluorine, which can degrade pollutants in the air, absorb ultraviolet rays and have good infrared heat shielding effects. However, during the preparation of the material, hydrogen gas needs to be introduced in a high-temperature environment, and the preparation process is complicated, which is not conducive to large-scale application.

Method used

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  • Synthesis and application of graphite phase carbon nitride-ammonium tungsten bronze composite photocatalyst
  • Synthesis and application of graphite phase carbon nitride-ammonium tungsten bronze composite photocatalyst
  • Synthesis and application of graphite phase carbon nitride-ammonium tungsten bronze composite photocatalyst

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Effect test

Embodiment 1

[0029] Take 10g of melamine and put it into a muffle furnace, heat up to 550°C at a heating rate of 2.2°C / min, keep it warm for 3 hours, and cool to room temperature to obtain a yellow solid, which is ground; The heating rate was increased to 550°C, and the temperature was kept for 3 hours to obtain the product; a mixed solution was prepared with 30mL deionized water and 30mL 30% hydrogen peroxide with a mass percentage of 30mL, and 0.6g of the product was dispersed in the mixed solution, stirred for 10min, and transferred to hydrothermal In the still, keep it warm at 140°C for 10h; centrifuge the mixed solution with deionized water and ethanol in turn, wash, and dry to obtain graphite phase carbon nitride; dissolve 0.25g of ammonium paratungstate in 40mL of ethylene glycol, Stir magnetically for 40 minutes to obtain a light yellow transparent and uniform solution; cool to room temperature, add 20 mL of acetic acid, and stir for 20 minutes to make it evenly mixed; Centrifuge a...

Embodiment 2

[0049] Take 2g of thiourea and put it into a muffle furnace, heat it up to 500°C at a heating rate of 1°C / min, and keep it warm for 6 hours. After cooling down to room temperature, grind the yellow solid; Min heating rate to 500 ℃, heat preservation 6h; take 1g, dispersed in 20mL of 15% mass percent hydrogen peroxide and 10mL of deionized water mixed solution, after stirring for 20min, transferred to a hydrothermal kettle, at 120 ℃ for 12 hours; the mixture was centrifuged, washed, and dried with deionized water and ethanol in turn to obtain g-C 3 N 4 . Dissolve 0.2g of ammonium paratungstate in 20mL of ethylene glycol, and stir magnetically at 160°C for 60 minutes to obtain a light yellow, transparent and homogeneous solution; cool to room temperature, add 10mL of acetic acid, stir for 10min to make it evenly mixed; then transfer to 100mL In a hydrothermal kettle, conduct a hydrothermal reaction at 140°C for 72 hours; successively wash the precipitate with deionized water a...

Embodiment 3

[0052] Take 15g of dicyandiamide into a muffle furnace, heat it up to 530°C at a heating rate of 5°C / min, and keep it warm for 2 hours. After cooling down to room temperature, grind the yellow solid; The heating rate of min was raised to 530°C, and the product was kept for 2 hours to obtain the product; 0.1g of the product was dispersed in a mixed solution composed of 50mL of 18% hydrogen peroxide and 40mL of deionized water, stirred for 30min, and then transferred to a hydrothermal kettle , kept at 160°C for 4h; the mixture was centrifuged, washed, and dried with deionized water and ethanol in turn to obtain g-C 3 N 4. Dissolve 0.6g of ammonium paratungstate in 60mL of ethylene glycol, stir magnetically at 210°C for 30min to obtain a light yellow, transparent and uniform solution; cool to room temperature, add 50mL of acetic acid, stir for 30min to make it evenly mixed; then transfer to 100mL of water In a hot kettle, at 180°C, hydrothermally react for 10 hours; successivel...

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Abstract

The invention discloses synthesis and application of a graphite phase carbon nitride-ammonium tungsten bronze composite photocatalyst, and the method comprises the following steps: calcining reactantstwice, cooling to room temperature and grinding into powder; dispersing in a mixed solution consisting of hydrogen peroxide and deionized water, and carrying out hydrothermal reaction to obtain graphite phase carbon nitride; preparing ammonium tungstate, ethylene glycol and acetic acid into ammonium tungsten bronze by a hydrothermal method; dispersing the graphite phase carbon nitride and the ammonium tungsten bronze in a dispersant, and performing ultrasonic stirring and centrifugal drying to prepare the graphite phase carbon nitride-ammonium tungsten bronze composite photocatalyst. The composite photocatalyst is used for degrading pollutants in air and infrared heat shielding. The synthesis method has the advantages of simple operation, environmental protection, energy conservation, flexibility, convenience and low cost, and effectively improves the photocatalytic activity of g-C3N4; and the graphite phase carbon nitride-ammonium tungsten bronze composite photocatalyst has a wide application prospect in the fields of pollutant treatment and intelligent window glass.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation, and relates to a graphite phase carbon nitride-ammonium tungsten bronze (g-C 3 N 4 / (NH 4 ) X WO 3 ) Synthesis and application of composite photocatalysts. Background technique [0002] Energy shortage and environmental pollution are two major problems facing mankind today. At present, fossil energy is the main energy source for human production and life. While meeting people's needs, it also brings adverse effects on the ecological environment. Therefore, the use of scientific methods to control environmental pollution has become the focus of researchers. As a clean and renewable energy source, solar energy is an ideal alternative energy source. Semiconductor-based photocatalytic technology can use the special bandgap structure of semiconductors to generate electrons and hole pairs with reduction and oxidation capabilities under the drive of solar energy, and degrade and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86G02B1/00G02B5/00
CPCB01J27/24B01D53/86G02B5/003G02B1/002B01D2258/06B01J35/39
Inventor 刘斌李振张新强王育华
Owner LANZHOU UNIVERSITY
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