A g-c that rapidly degrades pollutants 3 no 4 Composite photocatalyst and preparation method thereof

Abstract

The invention provides a g‑C that rapidly degrades pollutants 3 N 4 Composite photocatalyst and preparation method thereof. The g‑C 3 N 4 Composite photocatalyst, using raw material g‑C 3 N 4 Prepared with hydrogen peroxide solution. g-C of the present invention 3 N 4 The composite photocatalyst has strong visible light absorption ability and good photocatalytic performance, and can quickly degrade pollutants in water.

Description

technical field

[0001] The invention relates to the technical field of photocatalysts, in particular to a g-C that rapidly degrades pollutants 3 N 4 Composite photocatalyst and preparation method thereof. Background technique

[0002] Graphite carbon nitride (g-C 3 N 4 ) has excellent physical and chemical properties such as simple preparation, heat resistance, corrosion resistance, and special electronic energy band structure. Therefore, as a new type of organic polymer photocatalyst that responds to visible light, it is widely used in photocatalytic cracking of water to produce hydrogen and air purification. and water pollution treatment. g-C 3 N 4 As a photocatalyst, it can excite electrons in the valence band to the conduction band and form holes in the valence band under visible light irradiation. The process of photocatalysis is to use active species such as hydroxyl radicals and superoxide anion radicals generated by light excitation to generate electrons, hole...

Examples

Embodiment 1

[0030] g-C in this example 3 N 4 Composite photocatalyst, using raw material g-C 3 N 4 and hydrogen peroxide solution, wherein, in mg / mL, g-C 3 N 4 The mass / volume ratio with hydrogen peroxide solution is 6:1, and the concentration of hydrogen peroxide is 30%.

[0031] Preparation of pure g-C 3 N 4 The process is: put urea into the crucible, put the lid on and put it into a muffle furnace for calcination at 500°C for 2 hours, the initial temperature is 20°C, and the heating rate is 5°C / min. 3 N 4 Powder.

[0032] Prepare above-mentioned g-C in the present embodiment 3 N 4 The composite photocatalyst is as follows: the above g-C 3 N 4Put 0.15g of powder into a 50mL single-necked flask, add 25mL of hydrogen peroxide solution, place the flask in an oil bath, install a condenser tube, turn on the water circulation, turn on the magnetic stirring, set the temperature of the oil bath to 110°C, and the reflux time 6h, after the reaction was completed, the solution was tak...

Embodiment 2

[0034] g-C in this example 3 N 4 Composite photocatalyst, using raw material g-C 3 N 4 and hydrogen peroxide solution, wherein, in mg / mL, g-C 3 N 4 The mass / volume ratio with hydrogen peroxide solution is 6:1, and the concentration of hydrogen peroxide is 30%.

[0035] Preparation of pure g-C 3 N 4 The process is: put urea into the crucible, put the lid on and put it in a muffle furnace for calcination at 500°C for 2.5h, the initial temperature is 20°C, the heating rate is 10°C / min, after the calcination is completed, cool naturally to room temperature, take out the sample to obtain pure g-C 3 N 4 Powder.

[0036] Prepare above-mentioned g-C in the present embodiment 3 N 4 The composite photocatalyst is as follows: the above g-C 3 N 4 Put 0.15g of powder into a 50mL single-necked flask, add 25mL of hydrogen peroxide solution, place the flask in an oil bath, turn on the magnetic stirring, add 0.25mL of tetrabutyl titanate solution drop by drop, install the condenser...

Embodiment 3

[0038] g-C in this example 3 N 4 Composite photocatalyst, using raw material g-C 3 N 4 and hydrogen peroxide solution, wherein, in mg / mL, g-C 3 N 4 The mass / volume ratio with hydrogen peroxide solution is 6:1, and the concentration of hydrogen peroxide is 30%.

[0039] Preparation of pure g-C 3 N 4 The process is: put urea into the crucible, put the lid on and put it in a muffle furnace for calcination at 500°C for 2.5h, the initial temperature is 20°C, the heating rate is 10°C / min, after the calcination is completed, cool naturally to room temperature, take out the sample to obtain pure g-C 3 N 4 Powder.

[0040] Prepare above-mentioned g-C in the present embodiment 3 N 4 The composite photocatalyst is as follows: the above g-C 3 N 4 Put 0.15g of powder into a 50mL single-necked flask, add 25mL of hydrogen peroxide solution, place the flask in an oil bath, turn on magnetic stirring, add 1mL of tetrabutyl titanate solution drop by drop, install a condenser tube, tu...

technical field

[0001] The invention relates to the technical field of photocatalysts, in particular to a g-C that rapidly degrades pollutants 3 N 4 Composite photocatalyst and preparation method thereof. Background technique

[0002] Graphite carbon nitride (g-C 3 N 4 ) has excellent physical and chemical properties such as simple preparation, heat resistance, corrosion resistance, and special electronic energy band structure. Therefore, as a new type of organic polymer photocatalyst that responds to visible light, it is widely used in photocatalytic cracking of water to produce hydrogen and air purification. and water pollution treatment. g-C 3 N 4 As a photocatalyst, it can excite electrons in the valence band to the conduction band and form holes in the valence band under visible light irradiation. The process of photocatalysis is to use active species such as hydroxyl radicals and superoxide anion radicals generated by light excitation to generate electrons, hole...

Examples

Embodiment 1

[0030] g-C in this example 3 N 4 Composite photocatalyst, using raw material g-C 3 N 4 and hydrogen peroxide solution, wherein, in mg / mL, g-C 3 N 4 The mass / volume ratio with hydrogen peroxide solution is 6:1, and the concentration of hydrogen peroxide is 30%.

[0031] Preparation of pure g-C 3 N 4 The process is: put urea into the crucible, put the lid on and put it into a muffle furnace for calcination at 500°C for 2 hours, the initial temperature is 20°C, and the heating rate is 5°C / min. 3 N 4 Powder.

[0032] Prepare above-mentioned g-C in the present embodiment 3 N 4 The composite photocatalyst is as follows: the above g-C 3 N 4Put 0.15g of powder into a 50mL single-necked flask, add 25mL of hydrogen peroxide solution, place the flask in an oil bath, install a condenser tube, turn on the water circulation, turn on the magnetic stirring, set the temperature of the oil bath to 110°C, and the reflux time 6h, after the reaction was completed, the solution was tak...

Embodiment 2

[0034] g-C in this example 3 N 4 Composite photocatalyst, using raw material g-C 3 N 4 and hydrogen peroxide solution, wherein, in mg / mL, g-C 3 N 4 The mass / volume ratio with hydrogen peroxide solution is 6:1, and the concentration of hydrogen peroxide is 30%.

[0035] Preparation of pure g-C 3 N 4 The process is: put urea into the crucible, put the lid on and put it in a muffle furnace for calcination at 500°C for 2.5h, the initial temperature is 20°C, the heating rate is 10°C / min, after the calcination is completed, cool naturally to room temperature, take out the sample to obtain pure g-C 3 N 4 Powder.

[0036] Prepare above-mentioned g-C in the present embodiment 3 N 4 The composite photocatalyst is as follows: the above g-C 3 N 4 Put 0.15g of powder into a 50mL single-necked flask, add 25mL of hydrogen peroxide solution, place the flask in an oil bath, turn on the magnetic stirring, add 0.25mL of tetrabutyl titanate solution drop by drop, install the condenser...

Embodiment 3

[0038] g-C in this example 3 N 4 Composite photocatalyst, using raw material g-C 3 N 4 and hydrogen peroxide solution, wherein, in mg / mL, g-C 3 N 4 The mass / volume ratio with hydrogen peroxide solution is 6:1, and the concentration of hydrogen peroxide is 30%.

[0039] Preparation of pure g-C 3 N 4 The process is: put urea into the crucible, put the lid on and put it in a muffle furnace for calcination at 500°C for 2.5h, the initial temperature is 20°C, the heating rate is 10°C / min, after the calcination is completed, cool naturally to room temperature, take out the sample to obtain pure g-C 3 N 4 Powder.

[0040] Prepare above-mentioned g-C in the present embodiment 3 N 4 The composite photocatalyst is as follows: the above g-C 3 N 4 Put 0.15g of powder into a 50mL single-necked flask, add 25mL of hydrogen peroxide solution, place the flask in an oil bath, turn on magnetic stirring, add 1mL of tetrabutyl titanate solution drop by drop, install a condenser tube, tu...

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