Preparation method and applications of fluorescent carbon quantum dots

A technology of carbon quantum dots and fluorescence, which is applied in the field of preparation of fluorescent carbon quantum dots, and achieves the effects of simple method, time saving and low cost

Active Publication Date: 2020-01-17
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to simplify the preparation process and solve the technical problem of how to directly measure metronidazole without modifying the fluorescent carbon quantum dots, a fluorescent carbon quantum dot is provided Dot preparation method and its application

Method used

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  • Preparation method and applications of fluorescent carbon quantum dots
  • Preparation method and applications of fluorescent carbon quantum dots
  • Preparation method and applications of fluorescent carbon quantum dots

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Effect test

Embodiment 1

[0038] A preparation method of fluorescent carbon quantum dots, comprising the steps of:

[0039] (1) Take Houttuynia cordata sold in Chinese medicine stores as a carbon source, pulverize it and pass through a 50-mesh sieve to obtain Houttuynia cordata granules;

[0040] (2) Mix 0.50g Houttuynia cordata granules with 30mL double-distilled water and place in a 50mL polytetrafluoroethylene-lined stainless steel reaction kettle, shake and mix evenly, seal it, place it in an oven, and react at a temperature of 80°C for 7 hours , naturally cooled to room temperature to obtain a brownish-yellow liquid;

[0041] (3) Centrifuge the brownish-yellow liquid obtained at a speed of 11000rpm for 30min, take the supernatant, and filter the supernatant with a 0.22 μm polytetrafluoroethylene filter membrane to obtain a fluorescent carbon quantum dot solution.

[0042] The prepared fluorescent carbon quantum dot solution was observed by transmission electron microscope and the particle size di...

Embodiment 2

[0048] A preparation method of fluorescent carbon quantum dots, comprising the steps of:

[0049] (1) Take Houttuynia cordata sold in Chinese medicine stores as a carbon source, pulverize it and pass through a 50-mesh sieve to obtain Houttuynia cordata granules;

[0050] (2) Mix 0.30g Houttuynia cordata granules with 30mL double-distilled water and place in a 50mL polytetrafluoroethylene-lined stainless steel reaction kettle, shake and mix evenly, seal it, place it in an oven, and react at a temperature of 120°C for 5 hours , naturally cooled to room temperature to obtain a brownish-yellow liquid;

[0051] (3) Centrifuge the brownish-yellow liquid obtained at a speed of 11000rpm for 30min, take the supernatant, and filter the supernatant with a 0.22 μm polytetrafluoroethylene filter membrane to obtain a fluorescent carbon quantum dot solution.

Embodiment 3

[0053] A preparation method of fluorescent carbon quantum dots, comprising the steps of:

[0054] (1) Take Houttuynia cordata sold in Chinese medicine stores as a carbon source, pulverize it and pass through a 50-mesh sieve to obtain Houttuynia cordata granules;

[0055] (2) Mix 0.70g Houttuynia cordata granules with 30mL double-distilled water and place in a 50mL polytetrafluoroethylene-lined stainless steel reaction kettle, shake and mix evenly, seal it, place it in an oven, and react at a temperature of 160°C for 3 hours , naturally cooled to room temperature to obtain a brownish-yellow liquid;

[0056] (3) Centrifuge the brownish-yellow liquid obtained at a speed of 11000rpm for 30min, take the supernatant, and filter the supernatant with a 0.22 μm polytetrafluoroethylene filter membrane to obtain a fluorescent carbon quantum dot solution.

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Abstract

The invention relates to a preparation method and applications of fluorescent carbon quantum dots. The method comprises: carrying out a hydrothermal reaction on houttuynia cordata as a carbon source and redistilled water at 80-160 DEG C for 3-10 h to obtain a brown yellow liquid, centrifuging, taking the supernatant, and filtering to obtain a fluorescent carbon quantum dot solution. According to the invention, the maximum excitation wavelength of the fluorescent carbon quantum dots prepared by taking houttuynia cordata as the carbon source is 320 nm and is overlapped with the maximum absorption wavelength of metronidazole; a metronidazole determining method using carbon quantum dots as fluorophores, using metronidazole as an absorbent and using fluorescence internal filtration as a quenching mechanism is provided; the modification of carbon quantum dots is not required, and the covalent bond bonding between metronidazole and the carbon quantum dots is not needed; and the method is simple, rapid, low in cost and capable of saving time.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a preparation method and application of fluorescent carbon quantum dots. Background technique [0002] Metronidazole is a nitroimidazole derivative with broad-spectrum antibacterial properties. It is widely used as anti-amoeba, anti-trichomonas, anti-anaerobic bacteria and other drugs for the treatment of oral infection, abdominal infection, lower respiratory tract infection, bone and Treatment of joint infections, and vaginitis, urethritis, and prostatitis caused by Trichomonas. Metronidazole is added to poultry and fish feed to destroy the parasite. Because of its low price and effective treatment of bacterial infections, some unscrupulous traders still use metronidazole as an additive in cosmetics. Prolonged use of metronidazole will cause accumulation in the body, causing epilepsy, neuropathy, cerebellar softening and other adverse reactions, bringing health risks to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y40/00G01N21/64
CPCC01B32/15C09K11/65B82Y20/00B82Y40/00G01N21/643C01P2004/04C01P2004/64C01P2002/82G01N2021/6432Y02A50/30
Inventor 唐江宏刘丹张雅珩连宁吴海燕张国华
Owner JIANGSU UNIV OF TECH
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