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Red fluorescent carbon dot and preparation method thereof, fluorescence sensor, construction method and application thereof

A fluorescent sensor, red fluorescent technology, applied in the field of fluorescent sensing, to achieve excellent stability and optical properties, high quantum yield, and the effect of eliminating the interference of metal ions

Active Publication Date: 2019-11-08
CHANGSHA UNIVERSITY
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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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  • Red fluorescent carbon dot and preparation method thereof, fluorescence sensor, construction method and application thereof
  • Red fluorescent carbon dot and preparation method thereof, fluorescence sensor, construction method and application thereof
  • Red fluorescent carbon dot and preparation method thereof, fluorescence sensor, construction method and application thereof

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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 detection of alachlor concentration based on fluorescence quenching. The red fluorescent carbon dot is spherical, and has a diameter distribution of 3.25-5.75nm. The mass content of C, N and O in the red fluorescent carbon dot is 75%-75.2%, 21%-21.1% and 3.5%-3.7% respectively. The red fluorescent carbon dot has high quantum yield, excellentstability and optical properties, good repeatability and high sensitivity, accurate and reliable detection result, high selectivity on alachlor, and can be combined with an alachlor quenching standard curve for application in detection of the concentration of alachlor herbicide in the environment (soil and environmental water). The invention also provides a preparation method of the red fluorescent carbon dot, a fluorescence sensor and a construction method thereof, as well as application of the fluorescence sensor to detection of the concentration of alachlor contained in environmental samples. The operation is simple, the cost is low, the reaction process is environment-friendly, and the interference of other metal ions in the environment can be eliminated.

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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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
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