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Cl-modified GQD/ZnO/acidified attapulgite nano-composite antibacterial agent and preparation method thereof

An acidified attapulgite and nanocomposite technology, applied in the fields of botanical equipment and methods, nanotechnology, nanotechnology, etc., can solve the problems of large specific surface area of ​​quantum dots, easy to agglomerate, affect antibacterial properties, etc., and achieve high antibacterial activity. The effect of easy agglomeration

Inactive Publication Date: 2021-02-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, small-sized quantum dots have a large specific surface area and are easy to agglomerate, which seriously affects their antibacterial properties.
[0004] Attapulgite (ATP) is a natural porous material carrier with a unique layer-chain crystal structure, and its crystals show fine rods and fibers, but the natural attapulgite has a low adsorption capacity for antibacterial materials, so It needs to be activated and modified to improve the adsorption performance

Method used

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  • Cl-modified GQD/ZnO/acidified attapulgite nano-composite antibacterial agent and preparation method thereof
  • Cl-modified GQD/ZnO/acidified attapulgite nano-composite antibacterial agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 4g of attapulgite and put it into a 5mol / L hydrochloric acid solution. After heating in a water bath at 70°C for 10 hours, the product is washed with distilled water for 3 times, and the upper layer is removed by standing each time to wash the attapulgite solution with water until neutral. Finally, centrifuge and dry the solid precipitate to obtain acidified attapulgite.

[0024] After heating 3 g of citric acid (CA) at 200 °C for 30 min to turn dark orange, NaOH aqueous solution was added to adjust the pH to neutral to obtain an aqueous solution of GQDs. Take 130mg of GQD in 50ml of HCl and heat in a water bath at 65°C for 2h to obtain chlorine-modified graphene quantum dots.

[0025] Weigh 1g of zinc acetate dihydrate and 0.05g of chlorine-modified graphene quantum dots and disperse them in 100 mL of absolute ethanol, stir well, add 400 mg of AP, pour into a three-necked flask, and heat in a water bath at 60°C for 1.5h , to obtain zinc, GQD-Cl, acidified attapu...

Embodiment 2

[0029] Weigh 7g of attapulgite and put it into 8mol / L hydrochloric acid solution. After heating in a water bath at 50°C for 25h, the product is washed with distilled water 3 times, and the upper layer is removed by standing each time, so as to wash the attapulgite solution with water until neutral. Finally centrifuged,

[0030] Take the solid precipitate and dry it to obtain the acidified attapulgite.

[0031] After heating 2 g of citric acid (CA) at 200 °C for 30 min to turn dark orange, NaOH aqueous solution was added to adjust the pH to neutral to obtain an aqueous solution of GQDs. Take 120mg of GQD in 50ml of HCl and heat in a water bath at 60°C for 2h to obtain chlorine-modified graphene quantum dots.

[0032] Weigh 1 g of zinc acetate dihydrate and 0.01 g of chlorine-modified graphene quantum dots and disperse them in 100 mL of absolute ethanol. After stirring evenly, add 600 mg of AP, pour into a three-necked flask, and heat in a water bath at 80°C for 3 h. The mixed...

Embodiment 3

[0034] Weigh 6g of attapulgite and put it into 7mol / L hydrochloric acid solution. After heating in a water bath at 60°C for 20 hours, the product is washed with distilled water three times, and the upper clear night is removed by standing each time, so as to wash the attapulgite solution with water until neutral. Finally, centrifuge and dry the solid precipitate to obtain acidified attapulgite.

[0035] After heating 5 g of citric acid (CA) at 200 °C for 30 min to turn dark orange, NaOH aqueous solution was added to adjust the pH to neutral to obtain an aqueous solution of GQDs. Take 140mg of GQD in 50ml of HCl, and heat in a water bath at 80°C for 2h to obtain chlorine-modified graphene quantum dots.

[0036]Weigh 1g of zinc acetate dihydrate and 0.04g of chlorine-modified graphene quantum dots and disperse them in 100 mL of absolute ethanol, stir well, add 500 mg of AP, pour into a three-necked flask, and heat in a water bath at 70°C for 2.5h , to obtain zinc, GQD-Cl, acidi...

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Abstract

The invention discloses a Cl-modified GQD / ZnO / acidified attapulgite nano-composite antibacterial agent and a preparation method thereof. ATP is used as a carrier, HCl is used as a modifier, Cl-modified GQD and a novel photoelectric functional material ZnO quantum dot are used as main antibacterial components, defect sites of GQD are increased by modifying GQD, and GQD is compounded with ZnO to effectively inhibit compounding of photo-induced electrons on the surface of ZnO and promote generation of active oxygen; and finally, the Cl-modified GQD / ZnO quantum dots are loaded on the surface of the acidified attapulgite, bacteria are adsorbed to the surface of the acidified attapulgite by utilizing the huge specific surface area and high absorptivity of ATP, and then the Cl-modified GQD / ZnO quantum dots (GQD-Cl / ZnO) loaded on the surface of the acidified attapulgite and among pores play a role in efficiently resisting bacteria. The technical scheme has the advantages of safety, no pollution, high antibacterial efficiency and the like, and the antibacterial rate of the nano composite antibacterial agent prepared by adopting 3mg / ml to escherichia coli can reach 96.88 percent.

Description

technical field [0001] The invention relates to a safe, environment-friendly and high-efficiency antibacterial agent, in particular to a Cl-modified GQD / ZnO / acidified attapulgite nanocomposite antibacterial agent and a preparation method thereof. Background technique [0002] In recent years, the rapid reproduction of various pathogenic bacteria has led to material deterioration and human infection and illness, seriously affecting normal life and health and safety. Therefore, people have begun to use antibiotics in large quantities, and the resulting "super bacteria" problem has seriously endangered human health. . Therefore, the research and development of green and eco-friendly new high-efficiency antibacterial materials is imminent. [0003] Nano-ZnO has been widely studied because of its safety, non-toxicity, high thermal stability and chemical stability. Relevant studies have shown that the antibacterial effect of nano-ZnO increases as the size decreases. However, as...

Claims

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Application Information

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IPC IPC(8): A01N25/08A01N59/00A01N59/16A01P1/00B82Y30/00
CPCA01N25/08A01N59/00A01N59/16B82Y30/00
Inventor 刘俊莉高朝阳吕钰洁刘辉李军奇
Owner SHAANXI UNIV OF SCI & TECH
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