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Green fluorescence carbon dot, preparation method thereof, fluorescence detection probe, and construction method and application of probe

A green fluorescence and fluorescence detection technology, applied in the field of fluorescence sensing, can solve problems such as no trifluralin detection, and achieve the effects of excellent stability and optical properties, elimination of interference, and accurate and reliable detection results.

Active Publication Date: 2019-11-15
CHANGSHA UNIVERSITY
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Problems solved by technology

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 trifluralin

Method used

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  • Green fluorescence carbon dot, preparation method thereof, fluorescence detection probe, and construction method and application of probe
  • Green fluorescence carbon dot, preparation method thereof, fluorescence detection probe, and construction method and application of probe
  • Green fluorescence carbon dot, preparation method thereof, fluorescence detection probe, and construction method and application of probe

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Embodiment

[0045] A kind of green fluorescent carbon point of the present invention, the synthetic process of green fluorescent carbon point is as figure 1 Shown, its preparation method of green fluorescent carbon dot comprises the following steps:

[0046] After the cherry tomatoes are cleaned with ethanol, washed with water, then cut into small pieces with a knife, weighed 20g and put them in a poly(tetrafluoroethylene) stainless steel reaction kettle, reacted at 180°C for 6h, and cooled to room temperature to obtain Sepia liquid, then centrifuged at 10000rpm for about 10min to remove the precipitate, collected the supernatant and filtered it with a 0.2μm nylon membrane, then dialyzed at room temperature with a dialysis bag with a molecular weight cutoff of 500Da for about 48h to remove tiny impurities, Finally, a dark brown solution containing CQDs was obtained, and additionally, solid CQDs were obtained by drying the CQDs solution in a freeze dryer. Before use, prepare 5 mg / mL CQDs ...

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Abstract

The invention discloses a green fluorescence carbon dot for detecting the concentration of trifluralin based on fluorescence quenching. The green fluorescence carbon dot is ellipsoidal, has a particlesize of 3.2-6.8 nm, and contains, by mass, 61-62% of C, 26-27% of O, 5.50-6% of P and 5-5.5% of N. The green fluorescence carbon dot has the advantages of excellent stability, excellent optical properties, good repeatability, high sensitivity, accurate and reliable detection result, and high selectivity to trifuralin, and can be applied to the detection of the concentration of the trifuralin herbicide in the environment after being combined with a trifuralin qenching standard curve. The invention also provides a preparation method of the green fluorescence carbon dot, a fluorescence detectionprobe, a construction method of the probe, and an application of the fluorescence detection probe in the detection of the concentration of the trifuralin in an environmental sample. The probe has theadvantages of simplicity in operation, low cost, environmentally-friendly reaction process, and elimination of the interference brought by other herbicides in the environment.

Description

technical field [0001] The invention belongs to the technical field of fluorescent sensing, and in particular relates to a green fluorescent carbon dot nanomaterial and a preparation method thereof, a fluorescent detection probe for detecting trifluralin concentration based on fluorescence quenching and a construction method thereof, and the use of the fluorescent detection probe Application to detect the concentration of trifluralin contained in environmental samples. Background technique [0002] Trifluralin, also known as 2,6-dinitro-N,N-dipropyl-4-trifluoromethylamine (TRF), has been used in agriculture since 1963 as a Selective herbicide for preemergence control. TRF is a benzene derivative belonging to the dinitroaniline family and is applied preemergence to control annual grasses and certain broadleaf weeds. TRFs can be used in combination or alone in different crop cultures. Due to its wide range of use and obvious environmental mobility, TRF is a potential pollut...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y30/00B82Y20/00G01N21/64
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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