Carbon nitride/tungsten trioxide two-dimensional composite Z-type photocatalytic material as well as preparation method and application thereof

A photocatalytic material, tungsten trioxide technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve undiscovered problems

Active Publication Date: 2020-10-27
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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  • Carbon nitride/tungsten trioxide two-dimensional composite Z-type photocatalytic material as well as preparation method and application thereof
  • Carbon nitride/tungsten trioxide two-dimensional composite Z-type photocatalytic material as well as preparation method and application thereof
  • Carbon nitride/tungsten trioxide two-dimensional composite Z-type photocatalytic material as well as preparation method and application thereof

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 as well as a preparation method and application thereof. The material is formed by compounding a Pt-loaded ultrathin carbon nitride nanosheet (Pt-CN/NS) and hydrogen treated tungsten trioxide (HWO), wherein the Pt-CN/NS has a curly two-dimensional network structure;the hydrogen treated tungsten trioxide is a two-dimensional nanosheet; the Pt-CN/NS and the HWO are compounded in a two-dimensional surface contact manner; the mass ratio of Pt-CN/NS to HWO is 0.5: 1to 40: 1. The prepared photocatalytic material is based on a Z-type photocatalytic mechanism and has a high visible light utilization rate, a low carrier recombination rate and efficient visible lightdecomposition water hydrogen production activity, the maximum visible light catalytic hydrogen production activity can reach 862 [mu] mol.h <-1 >, and the apparent quantum yield under 420 nm monochromatic light is 16.6%. The preparation method is rich in raw materials, simple in synthesis process, easy to control in operation and high in photo-generated charge separation efficiency, the problem of serious carrier recombination of g-C3N4 is solved to a great extent, and the preparation method has a great application prospect in the field of water photolysis.

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 Applications(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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