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Two-dimensional layered ternary nano-composite photocatalyst, and preparation method and application thereof

A nanocomposite, two-dimensional layered technology, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve the problem of low hydrogen production efficiency in water decomposition, accelerate the transfer of interface charges, and improve catalytic efficiency , Improve the effect of photocatalytic activity

Pending Publication Date: 2021-10-26
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention aims to propose a two-dimensional layered ternary nanocomposite photocatalyst and its preparation method and application to solve the problem of existing g-C 3 N 4 The problem of low efficiency of photocatalytic water splitting for hydrogen production

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  • Two-dimensional layered ternary nano-composite photocatalyst, and preparation method and application thereof
  • Two-dimensional layered ternary nano-composite photocatalyst, and preparation method and application thereof
  • Two-dimensional layered ternary nano-composite photocatalyst, and preparation method and application thereof

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preparation example Construction

[0036] The embodiment of the present invention provides a method for preparing a two-dimensional layered ternary nanocomposite photocatalyst, comprising the following steps:

[0037] S1. Calcining melamine in a muffle furnace to obtain g-C 3 N 4 ;

[0038] S2, put g-C 3 N 4 Grind into powder, add to deionized water, ultrasonically disperse into g-C 3 N 4 suspension;

[0039] S3, to g-C 3 N 4 Add nickel nitrate hexahydrate and cobalt nitrate hexahydrate into the suspension. After stirring for the first time, ammonia water is added dropwise, and then transferred to an autoclave for hydrothermal reaction. After treatment, the two-dimensional layered ternary nanocomposite photocatalyst Co (OH) 2 / g -C 3 N 4 / Ni(OH) 2 .

[0040] The present invention reacts in a Teflon-lined autoclave through a hydrothermal-precipitation technique, using layered Co(OH) 2 and Ni(OH) 2 Nanosheets to modify sheet-like g-C 3 N 4 , to prepare two-dimensional layered ternary nanocomposit...

Embodiment 1

[0051] This embodiment provides a method for preparing a two-dimensional layered ternary nanocomposite photocatalyst, comprising the following steps:

[0052] 1) Preparation of g-C 3 N 4 Nanosheets: put melamine in a muffle furnace, the temperature program of the muffle furnace is 5°C / min, the calcination time is 2h, the calcination temperature is 550°C, the reaction is carried out under nitrogen atmosphere, and it is taken out after cooling to room temperature. Grinding agate body to obtain pure phase g-C 3 N 4 Nanosheets;

[0053] 2) Add 1g of g-C 3 N 4 Disperse the powder in water and ultrasonically treat it for 30 minutes to obtain a uniformly dispersed suspension;

[0054] 3) Add 0.094g cobalt nitrate hexahydrate and 0.095g nickel nitrate hexahydrate to the suspension, stir at room temperature for 6 hours, add 1.2mL of 25wt% ammonia water dropwise, then transfer the mixed solution into a 100mL autoclave, After heat-precipitation reaction for 3 h, the collected prod...

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Abstract

The invention provides a two-dimensional layered ternary nano-composite photocatalyst, and a preparation method and application thereof. The preparation method comprises the following steps: placing melamine in a muffle furnace, and calcining to obtain g-C3N4; grinding the g-C3N4 into powder, adding the powder into deionized water, and performing ultrasonic dispersion to obtain a g-C3N4 suspension; and adding nickel nitrate hexahydrate and cobalt nitrate hexahydrate into the g-C3N4 suspension, stirring for a first time, dropwise adding ammonia water, transferring into a high-pressure kettle, carrying out a hydrothermal reaction, and carrying out post-treatment to obtain the two-dimensional layered ternary nano-composite photocatalyst. A water reduction cocatalyst and a water oxidation cocatalyst are introduced at the same time, under the synergistic effect of the water reduction cocatalyst and the water oxidation cocatalyst, electron-hole separation is accelerated, and the catalytic efficiency is improved; and the material with a two-dimensional layered structure is compounded, so that the interface contact area is increased, the transfer of interface charges is accelerated, and the photocatalytic activity is effectively improved.

Description

technical field [0001] The invention relates to the technical field of semiconductor photocatalytic hydrogen production, in particular to a two-dimensional layered ternary nanocomposite photocatalyst and its preparation method and application. Background technique [0002] Graphite Carbon Nitride g-C 3 N 4 As a non-metallic photocatalytic material, it can be excited by visible light and has a very suitable semiconductor energy band position, with a band gap of 2.7eV, a conduction band potential of -1.1V, and a valence band potential of 1.6V (vs. SHE), satisfying The thermodynamic requirements of photolysis of water to produce hydrogen and oxygen, as well as good thermal and chemical stability, are often used in photocatalysts, sensors, catalyst supports and energy storage materials. However, due to the high electron-hole recombination rate and small specific surface area, the bare g-C 3 N 4 The photocatalytic efficiency is relatively low. [0003] To improve g-C 3 N 4...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02B01J35/10C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277C01B2203/1058C01B2203/1094B01J35/40B01J35/39B01J35/613B01J35/638Y02E60/36
Inventor 张军周德森汪铁林
Owner WUHAN INSTITUTE OF TECHNOLOGY
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