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Preparation method and application of copper-doped carbon quantum dots

A technology of carbon quantum dots and copper doping, applied in the direction of botany equipment and methods, applications, chemical instruments and methods, etc., can solve the problems of less research on the photocatalytic performance of carbon quantum dots, and achieve high-efficiency antibacterial effects

Active Publication Date: 2018-11-16
KUNMING UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

Carbon quantum dots (CQDs) nanomaterials have a wide absorption spectrum and high absorption coefficient, non-toxic, stable chemical properties, abundant raw materials, simple preparation methods, etc., and their good electrical conductivity is conducive to charge transport; however, currently Most of the research on carbon quantum dots focuses on the light emission performance of carbon quantum dots, and there are few studies on the photocatalytic performance of carbon quantum dots. Carbon quantum dots strengthen TiO 2 Some results have been achieved in photocatalytic performance research

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  • Preparation method and application of copper-doped carbon quantum dots
  • Preparation method and application of copper-doped carbon quantum dots

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Embodiment 1

[0020] 1. Preparation of copper-doped carbon quantum dots: take 1.6gNa 2 [Cu(EDTA)] and 0.1 g of ascorbic acid were mixed evenly, placed in a corundum boat with a lid, and roasted in a high-temperature tube furnace at 300 °C for 2 h. After the roasting was completed, the black product was ground and dissolved in 100 mL of deionized water, and ultrasonicated for 20 min; then the black suspension was centrifuged at 15,000 rpm for 15 min, and the supernatant was passed through a 0.22 μm filter membrane; the filtrate was dried in a vacuum oven at 60 °C for 24 h to obtain copper-doped carbon quantum dots.

[0021] 2. Test of photocatalytic antibacterial performance of copper-doped carbon quantum dots on Escherichia coli: inoculate Escherichia coli (ATCC 11775) in LB medium, at 37°C, 200r min -1 Under the conditions of shaker culture for 12h, the bacterial solution was diluted gradiently to determine the concentration of the bacterial suspension to be 10 6 CFU / mL; take two groups ...

Embodiment 2

[0025] 1. Preparation of copper-doped carbon quantum dots: take 2.0gNa 2 [Cu(EDTA)] and 0.3 g of ascorbic acid were mixed evenly, placed in a corundum boat with a lid, and roasted in a high-temperature tube furnace at 300 °C for 3 h. After the roasting was completed, the black product was ground and dissolved in 100 mL of deionized water, and sonicated for 30 min; then the black suspension was centrifuged at 10,000 rpm for 20 min, and the supernatant was passed through a 0.22 μm filter membrane; carbon quantum dots.

[0026] 2. Test of photocatalytic antibacterial performance of copper-doped carbon quantum dots on E. coli: the effect is similar to Example 1. After 45 min of visible light irradiation, the bactericidal rate of copper-doped carbon quantum dots on E. coli reached 100%.

Embodiment 3

[0028] 1. Preparation of copper-doped carbon quantum dots: Take 1.8g Na 2[Cu(EDTA)] and 0.2 g of ascorbic acid were mixed evenly, placed in a corundum boat with a lid, and roasted in a high-temperature tube furnace at 300 °C for 2.5 h. After the roasting was completed, the black product was ground and dissolved in 100 mL of deionized in water, and ultrasonicated for 25 min; then the black suspension was centrifuged at 12,000 rpm for 18 min, and the supernatant was passed through a 0.22 μm filter membrane; the filtrate was dried in a vacuum oven at 62°C for 24 h to obtain copper-doped carbon quantum dots.

[0029] 2. Test of photocatalytic antibacterial performance of copper-doped carbon quantum dots on E. coli: the effect is similar to Example 1. After 45 min of visible light irradiation, the bactericidal rate of copper-doped carbon quantum dots on E. coli reached 100%.

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Abstract

The invention discloses a preparation method for copper-doped carbon quantum dots. The method comprises the following steps: Na2[Cu(EDTA)] with a saturated Schiff base planar structure is utilized asa carbon source and doping metal of the metal-doped carbon quantum dots, and after thermal decomposition is performed, the Na2[Cu(EDTA)] is converted into the copper-doped carbon quantum dots with copper coordination and a graphite structure. The quantum dots disclosed by the invention have a high fluorescence yield, and generate strong-oxidizing-performance hydroxyl free radicals .OH under visible light irradiation, the hydroxyl free radicals can penetrate cell walls of bacteria to enter the bacteria, prevent transportation of film-forming substances, and block respiratory systems and electron transmission systems of the bacteria, thereby effectively killing the bacteria; after the copper-doped carbon quantum dots are subjected to visible light irradiation for 45 min, a sterilization rateof the copper-doped carbon quantum dots to escherichia coli is 100%; and copper ions are a broad-spectrum bactericide, and the copper-doped carbon quantum dots are used as an effective photocatalystand generate active oxygen free radicals under visible light irradiation, and therefore a synergistic effect of the copper ions and the copper-doped carbon quantum dots enhances a photocatalytic sterilization effect on the escherichia coli.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of copper-doped carbon quantum dots and the application of copper-doped carbon quantum dots to photocatalytic antibacterial of Escherichia coli. Background technique [0002] Escherichia coli is an important indicator of water and food pollution, and is the most common and most abundant type of bacteria in the intestinal tract. In recent years, food safety incidents caused by Escherichia coli have emerged in an endless stream, and there are as many as 640 million cases caused by Escherichia coli every year , in my country, Escherichia coli is the primary source of disease causing diarrhea among residents in our country. Escherichia coli in the environment has become an important indicator of the existence of human pathogens, and has become the most important research in the fields of environmental protection, food hygiene, drinking water h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B01J23/72A01N59/20A01P1/00
CPCA01N59/20C09K11/65B01J23/72
Inventor 杨亚玲刘瑞琦
Owner KUNMING UNIV OF SCI & TECH
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