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A red fluorescent carbon dot and its preparation method, fluorescent sensor and its construction method and application

A fluorescence sensor, red fluorescence technology, applied in the field of fluorescence sensing, to achieve high quantum yield, excellent stability, accurate and reliable detection results

Active Publication Date: 2022-02-18
CHANGSHA UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, at present, most of the applications of carbon dots are biological applications such as metal ion sensors and cell imaging, and there is no precedent for using carbon dots as a fluorescent sensor to detect alachlor

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  • A red fluorescent carbon dot and its preparation method, fluorescent sensor and its construction method and application
  • A red fluorescent carbon dot and its preparation method, fluorescent sensor and its construction method and application
  • A red fluorescent carbon dot and its preparation method, fluorescent sensor and its construction method and application

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Embodiment

[0050] A kind of red fluorescent carbon point of the present invention, the synthesis of red fluorescent carbon point and its process for detecting alachlor such as figure 1 Shown, its preparation method of red fluorescent carbon dot comprises the following steps:

[0051] Weigh 324 mg (3 mmol) of p-phenylenediamine and disperse it in 50 mL of ethanol. After mixing thoroughly, transfer the mixture to a polytetrafluoroethylene microwave digestion tank, react at 800W, 220°C for 10 min, and cool to room temperature to obtain deep The red liquid was then centrifuged at 10,000rpm for about 10min to remove the precipitate, the supernatant was collected and filtered with a 0.2μm nylon membrane, and then dialyzed for about 48h at room temperature with a dialysis bag with a molecular weight cutoff of 500Da to remove tiny impurities. Finally, a dark red solution containing N-CQDs was obtained. Finally, solid N-CQDs were obtained by drying the red fluorescent carbon dots solution in a f...

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Abstract

The invention discloses a red fluorescent carbon dot for detecting the concentration of alachlor based on fluorescence quenching. The red fluorescent carbon dot is spherical and has a diameter distribution of 3.25-5.75nm. The mass of C, N and O in the red fluorescent carbon dot is The contents are 75%-75.2%, 21%-21.1%, 3.5%-3.7%, respectively. The red fluorescent carbon dot has high quantum yield, excellent stability and optical properties, good repeatability, high sensitivity, accurate and reliable detection results, high selectivity to alachlor, and can be quenched by combining alachlor The standard curve was used to detect the concentration of alachlor herbicide in the environment (soil and environmental water). The invention also provides the preparation method of the red fluorescent carbon dots, the fluorescent sensor and its construction method, and the application of the fluorescent sensor to detect the concentration of alachlor contained in the environmental sample. The operation is simple, the cost is low, the reaction process is environmentally friendly, and it can eliminate Interference from other metal ions in the environment.

Description

technical field [0001] The invention belongs to the technical field of fluorescent sensing, and in particular relates to a red fluorescent carbon dot nanomaterial and a preparation method thereof, a fluorescent sensor for detecting the concentration of alachlor based on fluorescence quenching and a construction method thereof, and the use of the fluorescent sensor to detect the concentration of alachlor in environmental samples. application of the concentration of alachlor contained. Background technique [0002] Alachlor, also known as 2-chloro-N-(methoxymethyl)-N-(2,6-diethylphenyl)acetamide, is one of the most widely used chloroacetanilide herbicides, with Control broadleaf weeds before emergence. It is a mixed herbicide suitable for weed control in soil before planting and during planting of corn, potato, peanut, soybean. However, high-volume use of alachlor can contaminate soil, water and other vegetation, as well as adversely affect hosts and other organisms such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65G01N21/64B82Y20/00B82Y30/00
CPCC09K11/65B82Y20/00B82Y30/00G01N21/643G01N2021/6432
Inventor 杜甫佑程珍芳阮贵华赵晨曦
Owner CHANGSHA UNIVERSITY