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A carbon nitride/tungsten trioxide two-dimensional composite z-type photocatalytic material, preparation method and application

A technology of photocatalytic materials and tungsten trioxide, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve undiscovered problems and achieve easy availability of raw materials, high redox ability, large The effect of applying the foreground

Active Publication Date: 2022-02-01
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there is no relevant report on the ultra-thin carbon nitride / hydrogen-treated tungsten trioxide 2D / 2D composite Z-type photocatalytic material involved in the present invention

Method used

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  • A carbon nitride/tungsten trioxide two-dimensional composite z-type photocatalytic material, preparation method and application
  • A carbon nitride/tungsten trioxide two-dimensional composite z-type photocatalytic material, preparation method and application
  • A carbon nitride/tungsten trioxide two-dimensional composite z-type photocatalytic material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method is as follows:

[0043] (1) Add 12g of urea into a 50mL porcelain crucible, 550°C, 5°C·min -1 Calcined for 2h under the condition of heating rate, and ground to obtain g-C 3 N 4 powder; take 50 mg of the powder in a porcelain boat, and then at 520 ° C, 5 ° C min -1 Calcined for 3 hours under the condition of heating rate to obtain ultra-thin carbon nitride (CN / NS);

[0044] (2) The ultra-thin product is dispersed in 40mL deionized water and 15mL methanol solution, and then an appropriate amount of 0.08mol L -1 H 2 PtCl 6 Solution, ultrasonically dispersed for 5 minutes, the above suspension was irradiated under a high-pressure mercury lamp for 3 hours, centrifuged, washed, and dried to obtain 1 wt% Pt-loaded carbon nitride (Pt-CN / NS);

[0045] (3) Take 0.5000g of Na 2 WO 4 2H 2 O was dissolved in 60 mL of deionized water, and then 22 mL of HCl solution (3.0 M) was added dropwise with stirring to obtain a light yellow floc, and 0.4500 g of...

Embodiment 2

[0051] (1) Add 12g of urea into a 50mL porcelain crucible, 550°C, 5°C·min -1 Calcined for 2h under the condition of heating rate, and ground to obtain g-C 3 N 4 powder; take 50mg of the powder in a porcelain boat, and then at 520 ° C, 5 ° C min -1 Calcined for 3 hours under the condition of heating rate to obtain ultra-thin carbon nitride (CN / NS);

[0052] (2) The ultra-thin product is dispersed in 40mL deionized water and 15mL methanol solution, and then an appropriate amount of 0.08mol L -1 H 2 PtCl 6 Solution, ultrasonically dispersed for 5 minutes, the above suspension was irradiated under a high-pressure mercury lamp for 3 hours, centrifuged, washed, and dried to obtain 1 wt% Pt-loaded carbon nitride (Pt-CN / NS);

[0053] (3) Take 0.5000g of Na 2 WO 4 2H 2 O was dissolved in 60 mL of deionized water, and then 22 mL of HCl solution (3.0 M) was added dropwise with stirring to obtain a light yellow floc, and 0.4500 g of (NH 4 ) 2 C 2 o 4 ·H 2 O, stir until the so...

Embodiment 3

[0056] (1) Add 12g of urea into a 50mL porcelain crucible, 550°C, 5°C·min -1 Calcined for 2h under the condition of heating rate, and ground to obtain g-C 3 N 4 powder; take 50mg of the powder in a porcelain boat, and then at 520 ° C, 5 ° C min -1 Calcined for 3 hours under the condition of heating rate to obtain ultra-thin carbon nitride (CN / NS);

[0057] (2) The thin product is dispersed in 40mL deionized water and 15mL methanol solution, and then add an appropriate amount of 0.08mol L -1 H 2 PtCl 6 Solution, ultrasonically dispersed for 5 minutes, the above suspension was irradiated under a high-pressure mercury lamp for 3 hours, centrifuged, washed, and dried to obtain 1 wt% Pt-loaded carbon nitride (Pt-CN / NS);

[0058] (3) Take 0.5000g of Na 2 WO 4 2H 2 O was dissolved in 60 mL of deionized water, and then 22 mL of HCl solution (3.0 M) was added dropwise with stirring to obtain a light yellow floc, and 0.4500 g of (NH 4 ) 2 C 2 o 4 ·H 2 O, stir until the solu...

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Abstract

The invention discloses a carbon nitride / hydrogen treated tungsten trioxide two-dimensional composite Z-type photocatalytic material, a preparation method and an application. The material is composed of Pt-supported ultrathin carbon nitride nanosheets (Pt‑CN / NS) and hydrogen-treated tungsten trioxide (HWO); among them, Pt‑CN / NS has a curled two-dimensional network structure; hydrogen The treated tungsten trioxide is a two-dimensional nanosheet; the composite of Pt-CN / NS and HWO is a two-dimensional surface-contact composite; the mass ratio of Pt-CN / NS and HWO is 0.5:1-40:1. Based on the Z-type photocatalytic mechanism, the prepared photocatalytic material has high utilization rate of visible light, low carrier recombination rate, high-efficiency visible light splitting water hydrogen production activity, and visible light catalytic hydrogen production activity can reach up to 862 μmol h ‑1 , the apparent quantum yield under 420nm monochromatic light is 16.6%. The present invention has rich raw materials, simple synthesis process, easy to control operation, high separation efficiency of photogenerated charges, and largely overcomes g-C 3 N 4 The serious problem of carrier recombination has great application prospects in the field of photolysis of water.

Description

technical field [0001] The invention relates to the technical field of nanometer photocatalytic material preparation and hydrogen production application thereof, in particular to a carbon nitride / tungsten trioxide two-dimensional composite Z-type photocatalytic material, a preparation method and an application. Background technique [0002] Energy is the basis for human survival and development, but with the rapid development of all aspects of today's society, traditional fossil energy (coal, oil, natural gas) is gradually exhausted. Therefore, finding alternative environmentally friendly new energy sources is an urgent problem to be solved for the sustainable development of all countries. Hydrogen energy has the advantages of being directly obtained from water and having a wide range of sources, high combustion calorific value, clean and pollution-free combustion process, and the combustion product is pollution-free water that can be recycled and can exist in the form of ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/03B01J37/08B01J37/18B01J37/34C01B3/04
CPCB01J27/24B01J35/004B01J37/082B01J37/343B01J37/031B01J37/18C01B3/042C01B2203/0277C01B2203/1041Y02E60/36
Inventor 彭天右刘东
Owner WUHAN UNIV
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