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Ag/g-C3N4 composite photocatalyst and preparation method thereof

A composite light and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of low crystallinity, high exciton binding energy, photogenerated carrier mobility minor issues

Inactive Publication Date: 2017-07-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

g-C 3 N 4 The position of the energy gap is unique, and it can complete the photocatalytic reaction that requires high semiconductor under bbbb visible light, but due to the g-C 3 N 4 High exciton binding energy and low crystallinity make it difficult to separate photogenerated electrons and holes, and the mobility of photogenerated carriers is small, resulting in low quantum efficiency in the photocatalytic process

Method used

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  • Ag/g-C3N4 composite photocatalyst and preparation method thereof
  • Ag/g-C3N4 composite photocatalyst and preparation method thereof
  • Ag/g-C3N4 composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) g-C 3 N 4 Preparation of nanosheets:

[0028] 3 g of melamine was calcined, moved to a 600°C muffle furnace for calcination for 3 hours, and the heating rate was 4.5°C / min. After the calcination is finished, take out and grind; then the powder is calcined in the same procedure to obtain g-C 3 N 4 Nanosheets. Then add 1 g of g-C 3 N 4 The nanosheets are placed in a 60cm 3 Deionized water and 0.30g NaOH were mechanically stirred in a beaker for 30min; then, the solution was transferred to a 110°C reactor for 18h constant temperature thermal reaction; after the reaction was completed, the solid product was washed with deionized water and ethanol, Dried to give g-C 3 N 4 Nanosheets.

[0029] (2) Ag / g-C 3 N 4 Preparation of:

[0030] 0.20g of g-C 3 N 4 nanosheets and 0.05g AgNO 3 Dissolve in 50ml deionized water and stir; then put the solution under UV light for 3h to reduce AgNO 3 , after the reaction is finished, wait until it drops to room temperature...

Embodiment 2

[0033] By the steps in Example 1, the difference is (2) the g-C of 0.20g 3 N 4 nanosheets and 0.005g AgNO 3 Dissolve in 50ml deionized water and stir; then put the solution under UV light for 3h to reduce AgNO 3 , after the reaction is finished, wait until it drops to room temperature, wash the solid product with deionized water and ethanol, and dry to obtain Ag / g-C 3 N 4 composite photocatalyst.

[0034] Get the sample in (2) and carry out the photocatalytic degradation test in the photochemical reaction instrument, record this photocatalyst to concentration of 0.1g to be 20mg L -1 The degradation rate of tetracycline reached 21.35% within 120min.

Embodiment 3

[0036] By the steps in Example 1, the difference is (2) the g-C of 0.20g 3 N 4 nanosheets and 0.01g AgNO 3 Dissolve in 50ml deionized water and stir; then put the solution under UV light for 3h to reduce AgNO 3 , after the reaction is finished, wait until it drops to room temperature, wash the solid product with deionized water and ethanol, and dry to obtain Ag / g-C 3 N 4 composite photocatalyst.

[0037] Get the sample in (2) and carry out the photocatalytic degradation test in the photochemical reaction instrument, record this photocatalyst to concentration of 0.1g to be 20mg L -1 The degradation rate of tetracycline reached 27.42% within 120min.

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Abstract

The invention provides an Ag / g-C3N4 composite photocatalyst and a preparation method thereof. The preparation method comprises the following steps: putting melamine into a muffle furnace to roast according to a roasting procedure, and taking out the melamine to grind after finishing roasting; then roasting powder with the same procedure to obtain g-C3N4; then putting the g-C3N4 into a beaker containing deionized water and NaOH to perform mechanical stirring to obtain a mixed solution A; transferring the mixed solution into a reaction kettle to perform thermal reaction at constant temperature; after finishing reaction, washing a solid product by using deionized water and ethyl alcohol when the mixed solution drops to room temperature, and drying to obtain g-C3N4 nanosheets; putting the g-C3N4 nanosheets and AgNO3 into the deionized water to stir to obtain a mixed solution B; then putting the mixed solution B under an ultraviolet lamp to irradiate and reduce the AgNO3, after finishing reaction, when the mixed solution B drops to the room temperature, washing a solid product by using the deionized water and the ethyl alcohol, drying to obtain the Ag / g-C3N4 composite photocatalyst. By the Ag / g-C3N4 composite photocatalyst provided by the invention, the purpose of degrading antibiotic wastewater by using Ag / g-C3N4 as a catalyst is realized.

Description

technical field [0001] The invention belongs to the technical field of environmental material preparation, and relates to a photodecomposition deposition method for synthesizing Ag / g-C 3 N 4 Composite photocatalyst and preparation method thereof. Background technique [0002] Antibiotics mainly refer to some secondary metabolites or some artificially synthesized analogues produced by bacteria, molds or other microorganisms. It is mainly used to treat various bacterial infections or diseases caused by pathogenic microorganisms. It plays an extremely important role in human health and life safety. It is one of the great achievements of human beings in the field of medical science. In recent years, the types, production and consumption of antibiotics have been increasing, and the irrational use of antibiotics is serious, which has brought great harm to the environment. Taking ciprofloxacin as an example, many research reports have shown that antibiotics are widely present in...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCC02F1/30B01J27/24C02F2101/38B01J35/39
Inventor 秦莹莹黄铭君刘馨琳吕鹏卢健闫永胜李春香
Owner JIANGSU UNIV
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