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Preparation method and application of two-dimensional ZnO/g-C3N4 composite photocatalyst

A technology of g-c3n4 and compound light, which is applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of high compounding efficiency and achieve the effect of simple operation

Inactive Publication Date: 2019-09-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ZnO itself also has certain disadvantages, such as high recombination efficiency of photogenerated electron-hole pairs and strong photocorrosion, etc. Separation efficiency and effectively improve the photocorrosion phenomenon, improve the stability of the catalyst, incoming research has shown that nano-ZnO materials in the photocatalytic reduction of CO 2 The field still has a relatively good performance

Method used

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  • Preparation method and application of two-dimensional ZnO/g-C3N4 composite photocatalyst
  • Preparation method and application of two-dimensional ZnO/g-C3N4 composite photocatalyst
  • Preparation method and application of two-dimensional ZnO/g-C3N4 composite photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Two-dimensional thin-layer g-C 3 N 4 Precursor preparation:

[0030] Put 10g of urea into an alumina crucible, and calcine it in a muffle furnace at a high temperature of 550°C (the heating rate is 5°C / min) for 4h;

[0031] (2) Two-dimensional thin-layer g-C 3 N 4 Preparation of nanosheets:

[0032] The two-dimensional thin layer g-C 3 N 4 The precursor was added to the nitric acid solution with pH = 1, stirred for 8 hours under the condition of heating in water at 80°C, and then the obtained sample was washed with water several times (to neutral), dried in vacuum at 60°C, and then calcined for 2 hours at 500°C. After cooling to room temperature, the two-dimensional thin layer g-C can be obtained by grinding 3 N 4 Nanosheets.

[0033] (3) Two-dimensional ZnO / g-C 3 N 4 Preparation of composite photocatalyst:

[0034] The Zn (AC 2 ) in the solution and ultrasonically mixed for 30min until completely dispersed, and 50ml of C with a concentration of 0.8mol / ...

Embodiment 2

[0037] (1) Two-dimensional thin-layer g-C 3 N 4 Precursor preparation:

[0038] Put 10g of urea into an alumina crucible, and calcine it in a muffle furnace at a high temperature of 550°C (the heating rate is 5°C / min) for 4h;

[0039] (2) Two-dimensional thin-layer g-C 3 N 4 Preparation of nanosheets:

[0040] The two-dimensional thin layer g-C 3 N 4 The precursor was added to the nitric acid solution with pH = 1, stirred for 8 hours under the condition of heating in water at 80°C, and then the obtained sample was washed with water several times, dried in vacuum at 60°C, and then calcined for 2 hours at 500°C (the heating rate was 5°C / min), after being cooled to room temperature, the two-dimensional thin layer g-C can be obtained by grinding 3 N 4 Nanosheets.

[0041] (3) Two-dimensional ZnO / g-C 3 N 4 Preparation of composite photocatalyst:

[0042] It is the Zn(AC) of 0.6mol / L that the sample gained in 200mg (2) is added to 50ml concentration 2 The solution was ...

Embodiment 3

[0045] (1) Two-dimensional thin-layer g-C 3 N 4 Precursor preparation:

[0046] Put 10g of urea into an alumina crucible, and calcine it in a muffle furnace at a high temperature of 550°C (the heating rate is 5°C / min) for 4h;

[0047] (2) Two-dimensional thin-layer g-C 3 N 4 Preparation of nanosheets:

[0048] The two-dimensional thin layer g-C 3 N 4 The precursor was added to the nitric acid solution with pH = 1, stirred for 8 hours under the condition of heating in water at 80°C, and then the obtained sample was washed with water for several times, dried in vacuum at 60°C, and then calcined for a second time at 500°C for 2 hours, and then cooled to room temperature , Grinding to get two-dimensional thin layer g-C 3 N 4 Nanosheets.

[0049] (3) Two-dimensional ZnO / g-C 3 N 4 Preparation of composite photocatalyst:

[0050] It is the Zn(AC) of 0.8mol / L that the sample gained in 200mg (2) is added to 50ml concentration 2 The solution was mixed and ultrasonicated for...

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Abstract

The invention discloses a preparation method and application of a two-dimensional ZnO / g-C3N4 composite photocatalyst, belonging to the technical field of preparation of environmental protection materials. The preparation method comprises the following steps: 1, placing urea in an alumina crucible and carrying out calcination in a muffle furnace to obtain a two-dimensional thin-layer g-C3N4 precursor; 2, adding the two-dimensional thin-layer g-C3N4 precursor into a nitric acid solution, carrying out stirring under a constant temperature condition, washing the obtained solid until the solid is neutral, performing vacuum drying, then performing secondary calcination, and carrying out grinding after cooling to room temperature so as to obtain a two-dimensional thin-layer g-C3N4 nanosheet; and 3, adding the two-dimensional thin-layer g-C3N4 nanosheet into zinc acetate solutions with different concentrations, carrying out ultrasonic treatment to realize dispersion, adding a hexamethylenetetramine solution under stirring, carrying out stirring, performing centrifugal drying and carrying out secondary calcination to obtain the two-dimensional ZnO / g-C3N4 composite photocatalyst. According to the invention, the two-dimensional thin-layer g-C3N4 nanosheet is prepared through simple and convenient calcination, acid treatment and secondary calcination, and the high-efficiency green two-dimensional ZnO / g-C3N4 composite photocatalyst is further prepared.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental protection materials, in particular to a two-dimensional ZnO / g-C 3 N 4 Preparation method and application of composite photocatalyst. Background technique [0002] With the continuous development of industry, human beings have an increasing demand for energy, followed by an increasing consumption of fossil energy, CO 2 emissions are increasing day by day. According to the statistics of the International Energy Agency (IEA), in 2018 the global CO 2 The emissions were 33.143 billion tons. CO 2 The increasing content in the atmosphere aggravates the greenhouse effect. will CO 2 Transformation into value-added chemicals can effectively alleviate this problem and at the same time provide an effective way to alleviate the energy crisis. However, breaking CO 2 The C=O bond in the molecule needs 220~330kJ·mol -1 energy, which is difficult from a thermodynamic point of view. ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/03B01J37/08C01B32/40C07C1/12C07C9/04
CPCB01J27/24B01J37/03B01J37/082C07C1/12C01B32/40B01J35/39C07C9/04
Inventor 沈东程雨龙李洪达刘淳周亚举孙林林李鑫霍鹏伟王会琴
Owner JIANGSU UNIV
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