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

A technology of acidifying attapulgite and nano-composite, which is applied in the direction of botanical equipment and methods, fungicides, biocides, etc. It can solve the problems of difficult compounding, achieve high antibacterial activity and promote the production of active oxygen

Active Publication Date: 2021-01-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, both the acidified attapulgite and the Cl-GQD surface are negatively charged, and it is difficult to successfully combine the two

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 4g of attapulgite and put it into 7mol / L hydrochloric acid solution. After heating in a water bath at 70°C for 15 hours, the product is washed with distilled water for 3 times, and the upper layer 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.

[0026] After heating 3 g of citric acid (CA) at 210 °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 65°C for 3h to obtain chlorine-modified graphene quantum dots.

[0027] Weigh 2g of acidified attapulgite and 0.2g of APGQAS and disperse them in 50ml of water, mix and stir at 60°C for 3h, centrifuge and wash with water three times, then add 3g of chlorine-modified graphene quantum dots to it, heat in an oil bath at 70°C and stir for 7h. After th...

Embodiment 2

[0032] Weigh 5g of attapulgite and put it into 8mol / L hydrochloric acid solution. After heating in a water bath at 60°C for 25 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 centrifuged,

[0033] Take the solid precipitate and dry it to obtain the acidified attapulgite.

[0034] After heating 5 g of citric acid (CA) at 210 °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 60°C for 3h to obtain chlorine-modified graphene quantum dots.

[0035] Weigh 2g of acidified attapulgite and 0.8g of APGQAS and disperse them in 50ml of water, mix and stir at 60°C for 3h, centrifuge and wash with water three times, then add 1g of chlorine-modified graphene quantum dots to it, heat in an oil bath at 80...

Embodiment 3

[0037] Weigh 2g of attapulgite and put it into 6mol / L hydrochloric acid solution. After heating in a water bath at 80°C for 20h, 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.

[0038] After heating 4 g of citric acid (CA) at 210 °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 80°C for 3h to obtain chlorine-modified graphene quantum dots.

[0039]Weigh 2g of acidified attapulgite and .0.6g of APGQAS and disperse them in 50ml of water, mix and stir at 60°C for 3h, centrifuge and wash with water three times, then add 2g of chlorine-modified graphene quantum dots to it, heat in an oil bath at 60°C and stir for 4h. After t...

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Abstract

The invention discloses a Cl-modified GQD / APGQAS / acidified attapulgite nano-composite antibacterial agent and a preparation method thereof. ATP is used as a carrier, alkyl glycoside quaternary ammonium salt (APGQAS) is used as a surface modifier, Cl-modified GQD is used as a main antibacterial component, defect sites of GQD are increased by modifying GQD, compounding of surface photo-induced-electrons of GQD is effectively inhibited, and generation of active oxygen is promoted; then, surface modification is carried out on an acidified attapulgite by adopting APGQAS, and Cl-modified GQD quantumdots are adsorbed on the surface of the modified acidified attapulgite by utilizing the bridge action of a cationic polymer APGQAS; and finally, bacteria are adsorbed to the surface of a Cl-modifiedGQD / APGQAS / acidified attapulgite nano-composite material by utilizing the huge specific surface area and potential difference of the Cl-modified GQD / APGQAS / acidified attapulgite nano-composite material, and then the efficient antibacterial effect is achieved in cooperation with the natural antibacterial effect of Cl-modified GQD quantum dots (GQD-Cl) and APGQAS loaded on the surface of the modified attapulgite and among pores. The technical scheme has the advantages of safety, no pollution, high antibacterial efficiency and the like, and the antibacterial rate of the prepared nano-composite antibacterial agent on escherichia coli can reach 99.01% by adopting 4mg / ml of the nano-composite antibacterial agent.

Description

technical field [0001] The invention relates to a safe, environment-friendly and high-efficiency antibacterial agent, in particular to a Cl-modified GQD / APGQAS / acidified attapulgite nanocomposite antibacterial agent and a preparation method thereof. Background technique [0002] In recent years, a large number of germs have caused frequent infections and illnesses in the human body, seriously affecting normal life and health and safety. Therefore, people began to use a large number of antibiotics, and the resulting "super bacteria" seriously endangered human health. Therefore, the development of new and efficient antibacterial materials that are eco-friendly and environmentally friendly is imminent. [0003] New carbon quantum dot materials are favored due to their good water solubility, low biological toxicity and good electrical conductivity. Relevant studies have shown that the reactivity usually depends on defects or heteroatom sites. Carbon nanomaterials can generate r...

Claims

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Application Information

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IPC IPC(8): A01N59/00A01N43/16A01N25/08A01P3/00A01P1/00
CPCA01N59/00A01N43/16A01N25/08
Inventor 刘俊莉高朝阳刘辉李军奇
Owner SHAANXI UNIV OF SCI & TECH
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