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Preparation method of composite visible light catalyst graphene quantum dot/graphite-phase nitrogen carbide

A graphene quantum dot, visible light technology, applied in catalyst activation/preparation, chemical instruments and methods, botanical equipment and methods, etc., can solve problems such as lack of electron hole separation ability

Inactive Publication Date: 2021-08-06
南京奇安威尔环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] g-C 3 N 4 Compared with most semiconductor catalysts, it has a narrow band gap, which makes g-C 3 N 4 Can respond to visible light, but pure g-C 3 N 4 Does not have good electron-hole separation ability

Method used

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  • Preparation method of composite visible light catalyst graphene quantum dot/graphite-phase nitrogen carbide
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  • Preparation method of composite visible light catalyst graphene quantum dot/graphite-phase nitrogen carbide

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Example 1. Preparation and testing of pure g-C3N4 photocatalyst.

[0029] Step 1: Weigh about 10 g of melamine, place it in a porcelain boat, and calcinate at 550° C. for 4 hours.

[0030] Step 2: After cooling to room temperature, grind the calcined solid into a fine powder with an agate mortar to obtain pure g-C3N4(CN).

[0031] Step 3: Place about 0.08g of catalyst in 10ml of deionized water, ultrasonically disperse for 5 minutes, transfer the suspension to a 10×5×0.1cm3 glass slide with a pipette gun, and dry it in an oven at 60°C.

[0032] Step 4: Place the glass sheet loaded with the photocatalyst in the photocatalytic reactor, and feed a gas flow containing 20ppm NO and 5% O2 with N2 as the balance gas, and the gas flow rate is 200ml / min.

[0033] Step 5: After the gas is introduced, physical adsorption is carried out until the catalyst is saturated with the adsorption of NO in the gas flow. A 300W xenon lamp (λ>380nm) with an ultraviolet light filter is used as...

example 2

[0034] Example 2. Preparation and testing of GQDs / CN composite photocatalysts.

[0035] Step 1: Same as Step 1 and Step 2 of Example 1.

[0036] Step 2: Weigh 2 g of citric acid monohydrate (CA) into a round-bottomed flask, heat in an oil bath at 200°C for 30 min, and CA eventually turns bright orange. The product was slightly cooled, and a certain amount of 0.25 mol / L NaOH was added to adjust the pH of the solution to 7 to obtain a GQDs solution.

[0037] Step 3: Weigh 0.4g of CN in step 1 and mix with 1ml of GQDs solution in step 2, then add high-purity water to reduce the volume of the solution to about 40ml, and stir at room temperature for 30min.

[0038]Step 4: Pour the mixture into a 100ml polytetrafluoroethylene reactor and react at 180°C for 4h.

[0039] Step 5: After cooling the product obtained in step 4 to room temperature, pour the contents of the reactor into a centrifuge tube, centrifuge to remove the supernatant, then wash with deionized water and absolute et...

example 3

[0043] Example 3. Preparation and testing of GQDs / CN composite photocatalysts.

[0044] Step 1: Same as Step 1 in Example 2.

[0045] Step 2: Same as Step 2 in Example 2.

[0046] Step 3: Weigh 0.4g of CN in step 1 and mix with 9ml of GQDs solution in step 2, then add high-purity water to change the volume of the solution to about 40ml, and stir at room temperature for 30min.

[0047] Step 4: Same as Step 4 in Example 2.

[0048] Step 5: Same as Step 5 in Example 2.

[0049] Step 6: Same as Step 3 in Example 1.

[0050] Step 7: Same as Step 4 in Example 1.

[0051] Step 8: Same as Step 5 in Example 1.

[0052] Step 9: Change NO gas to HCHO gas for photocatalytic experiments.

[0053] Step 10: Take a certain amount of catalyst powder for sterilization experiment. The experimental group contains catalyst and is exposed to visible light, and the control group does not contain catalyst and is exposed to visible light.

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Abstract

The invention discloses a preparation method of a composite visible light catalyst graphene quantum dot / graphite phase nitrogen carbide, and solves the problem that the efficiency of degrading NO by g-C3N4 under visible light is relatively low. The method comprises the following steps: by taking citric acid monohydrate CA as a raw material, pyrolyzing to prepare GQDs; then taking melamine as a raw material, and calcining to prepare CN (Carbon Nitride); and then preparing the g-C3N4 composite photocatalyst GQDs / CN containing the graphene quantum dots GQDs by using a one-step hydrothermal method. Compared with a pure g-C3N4 photocatalyst, the GQDs / CN has the advantages that the NO degradation capability is improved, and the selectivity for generating NO3 <-> is enhanced. A new thought is provided for application of the graphene quantum dot doped semiconductor catalyst in the field of environmental purification.

Description

technical field [0001] The invention relates to a preparation of a composite visible light catalyst, in particular to a preparation method of a composite visible light catalyst graphene quantum dot / graphite phase nitrogen carbide (GQDs / CN). Background technique [0002] With the rapid development of industry, global air pollution is becoming more and more serious. Nitrogen oxides (NOx) and VOC gases are extremely harmful air pollutants that cause various environmental problems and are extremely harmful to human health; nitric oxide (NO) accounts for 95% of NOx and is insoluble in water. In addition, with the improvement of people's living standards, the public has higher and higher requirements for hygiene, so the elimination of bacteria has become a major concern. Therefore, it is necessary to develop technologies for efficient nitric oxide, VOC gas removal and sterilization. [0003] Wang Shuqin (Energy and Environment, 2021, (02)) mentioned that the currently widely use...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J37/10A01N59/00B01D53/56B01D53/72B01D53/86A01P1/00A61L2/08A61L2/235
CPCB01J27/24B01J37/082B01J37/10B01D53/8628B01D53/8668A01N59/00A61L2/088A61L2/235B01J35/39
Inventor 俞和胜崔云佩黄啸翔王腾贾六虎聂倩倩
Owner 南京奇安威尔环境科技有限公司
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