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NiCoP-g-C3N4/CdS composite photocatalyst as well as preparation method and application thereof

A nicop-g-c3n4, g-c3n4 technology, applied in the field of composite photocatalysis, can solve the problems of small number of active sites, low photocatalytic performance of composite catalysts, etc., and achieve high-efficiency hydrogen evolution performance and stability, excellent morphology characteristics , The effect of high hydrogen production activity

Pending Publication Date: 2021-07-16
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the number of active sites in the g-C3N4 / CdS system is small, The photocatalytic performance of the composite catalyst is not high, and a NiCoP-g-C3N4 / CdS composite photocatalyst, preparation method and application are provided

Method used

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  • NiCoP-g-C3N4/CdS composite photocatalyst as well as preparation method and application thereof
  • NiCoP-g-C3N4/CdS composite photocatalyst as well as preparation method and application thereof
  • NiCoP-g-C3N4/CdS composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Preparation of g-C 3 N 4 : Put 20g of urea compactly in a crucible, calcined at 500°C for 2h, then calcined at 520°C for 6h, and cooled to room temperature to obtain g-C 3 N 4 .

[0039] 2. Preparation of CdS: 2.312g CdCl 2 2.5H 2 O and 2.312 g NH 2 CSNH 2 Added into a 50mL Teflon-lined autoclave containing 30mL ethylenediamine, stirred for 10min and then sonicated for 10min. The autoclave was then heated to 160 °C and maintained for 48 h. The yellow product was collected, washed three times with deionized water and ethanol respectively, and the speed of the centrifuge was 10000r / min. Finally, the CdS was obtained by drying in an oven at 70°C.

[0040] 3. Preparation of g-C 3 N 4 / CdS: Accurately weigh 40mg of g-C 3 N 4 , and dispersed in 30mL of methanol. The above suspension was ultrasonically treated for 1 hour to obtain a homogeneous suspension, then, 2 g of CdS was added into the suspension, and the stirring was continued for 24 h. Finally, the co...

Embodiment 2

[0044] Steps 1-3 are the same as in Example 1.

[0045] 4. Preparation of 5% NiCoP-g-C 3 N 4 / CdS: Separately mix 24mg of NiCl 2 ·6H 2 O, 24mg of Co(NO 3 ) 2 ·6H 2 O and 120 mg NaH 2 PO 2 Dissolve in a beaker containing 10mL of water and stir to dissolve completely. After weighing 300mg of g-C 3 N 4 / CdS was added to the solution and sonicated for 1 h. Then, put the mixed product into an oven at 70°C for drying, fully drying the water completely. The ground product was then calcined in a tube furnace under N 2 Under protection, the temperature was raised to 300° C. at a rate of 5° C. / min, and calcined for 1 h, and then allowed to cool naturally to room temperature. Finally, it was washed three times with ultrapure water and absolute ethanol, and the speed of the centrifuge was 10000r / min. Put it in a 60°C oven and dry it for 12h to get 5%NiCoP-g-C 3 N 4 / CdS.

[0046] 5. Preparation of pure NiCoP: 24 mg of NiCl 2 ·6H 2 O, 24mg of Co(NO 3 ) 2 ·6H 2 O and 1...

Embodiment 3

[0049] Steps 1-3 are the same as in Example 1.

[0050] 4. Preparation of 7% NiCoP-g-C 3 N 4 / CdS: 33.6mg of NiCl 2 ·6H 2 O, 33.6 mg of Co(NO 3 ) 2 ·6H 2 O and 168 mg of NaH 2 PO 2 Dissolve in a beaker containing 10mL of water and stir to dissolve completely. After weighing 300mg of g-C 3 N 4 / CdS was added to the solution and sonicated for 1 h. Then, put the mixed product into an oven at 70°C for drying, fully drying the water completely. The ground product was then calcined in a tube furnace under N 2 Under protection, the temperature was raised to 300° C. at a rate of 5° C. / min, and calcined for 1 h, and then allowed to cool naturally to room temperature. Finally, it was washed three times with ultrapure water and absolute ethanol, and the speed of the centrifuge was 10000r / min. Put it in a 60°C oven and dry it for 12h to get 7%NiCoP-g-C 3 N 4 / CdS.

[0051] 5. 7% NiCoP-g-C 3 N 4 The XRD pattern of / CdS (such as figure 1 ), showing a diffraction peak sim...

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Abstract

The invention relates to the technical field of composite photocatalysis, in particular to a NiCoP-g-C3N4 / CdS composite photocatalyst as well as a preparation method and application thereof. The method comprises the steps of firstly, preparing pure CdS through a solvothermal method, and preparing g-C3N4 by directly calcining urea, wherein the g-C3N4 and the CdS have proper valence band and conduction band structures; preparing a g-C3N4 / CdS heterojunction through a chemical adsorption and self-assembly method; then adding a nickel source, a cobalt source and a phosphorus source into ultrapure water according to the mass ratio of 1: 1: 5; after the mixture is fully stirred and dissolved, adding a prepared g-C3N4 / CdS composite material, carrying out uniform ultrasonic treatment, completely evaporating moisture to dryness, and finally, calcining to successfully load granular NiCoP on the surface of the g-C3N4 / CdS heterojunction. The color of the composite material is related to the doping amount of NiCoP, the color of the composite material is gradually darkened from grass green along with the increase of the doping amount of NiCoP, the prepared composite photocatalyst is applied to a hydrogen evolution experiment, the hydrogen evolution performance is excellent, the hydrogen evolution rate is more than 23 times that of pure CdS, the repeated utilization rate is high, and the composite photocatalyst has a wide application prospect in the field of photocatalysis.

Description

technical field [0001] The invention relates to the technical field of composite photocatalysis, in particular to a NiCoP-g-C 3 N 4 / CdS composite photocatalyst, preparation method and application. Background technique [0002] With the rapid development of human society and the rapid improvement of economy, human beings' extensive use of fossil fuel energy is the main cause of environmental problems such as global warming. Photocatalytic water splitting based on solar energy to generate hydrogen energy is an ideal method for hydrogen production. At present, hydrogen energy, as an environmentally friendly new energy source, is the key to solving problems such as energy crisis and environmental pollution. [0003] CdS has a suitable band gap (2.4eV), the conduction band (CB) is more negative than the reduction potential of hydrogen protons, and it is a photocatalytic material that can respond under visible light, which has the advantages of low preparation cost and simple ...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277C01B2203/1052C01B2203/1058B01J35/39Y02E60/36Y02P20/133
Inventor 胡先海马汪洋胡鹏威龚成兵李明君杨雨庆罗想程从亮王平张峰君
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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