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Red-blue dual-emission fluorescent carbon dots and fluorometric analysis method for simultaneous detection of Al<3+> and Cu<2+> ions

A dual-emission fluorescence, fluorescent carbon dot technology, applied in fluorescence/phosphorescence, material excitation analysis, chemical instruments and methods, etc., to achieve the effect of simple steps

Active Publication Date: 2019-05-21
SHANXI DATONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, most of these probes can only be used for the detection of a single metal ion, and there is no literature report on the simultaneous detection of Al 3+ Ions and Cu 2+ Ion fluorescence analysis method

Method used

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  • Red-blue dual-emission fluorescent carbon dots and fluorometric analysis method for simultaneous detection of Al&lt;3+&gt; and Cu&lt;2+&gt; ions
  • Red-blue dual-emission fluorescent carbon dots and fluorometric analysis method for simultaneous detection of Al&lt;3+&gt; and Cu&lt;2+&gt; ions
  • Red-blue dual-emission fluorescent carbon dots and fluorometric analysis method for simultaneous detection of Al&lt;3+&gt; and Cu&lt;2+&gt; ions

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preparation example Construction

[0039] The preparation method of the red and blue dual-emission fluorescent carbon dots provided in a typical embodiment of the present invention includes the steps of: grinding dry tea leaves into powder, adding them to the reaction solvent to form a mixture, ultrasonicating at room temperature for 5-15 minutes, and dissolving the above mixture Transfer to a high-pressure reactor and heat the reaction at 140-250°C for 1-24 hours. Within the range of reaction conditions, the heating temperature can be 140-160°C, 160-180°C, 180-200°C, 200-220°C , 220-240°C; heating reaction time can be 1-6 hours, 6-12 hours, 12-18 hours, 18-24 hours. After the reaction, naturally cool to room temperature, centrifuge at 8000-12000 rpm to remove large particles, then filter with a 0.22 μm microporous membrane, and remove the solvent by rotary evaporation to obtain the red and blue dual-emission fluorescent carbon dots.

[0040] According to the above embodiments, the prepared red and blue double ...

Embodiment 1

[0059] Example 1: Preparation of Red and Blue Dual Emission Fluorescent Carbon Dots

[0060] Grind 300 mg of Dahongpao into powder, add it to 10 mL of acetone solvent, ultrasonicate at room temperature for 10 min, transfer the mixture to a 25 mL autoclave, heat and react at 180 °C for 1 hour, and cool to room temperature naturally after the reaction , centrifuge at 10,000 rpm to remove large particles, then filter with a 0.22 μm microporous membrane, and remove the solvent by rotary evaporation to obtain the red and blue dual-emission fluorescent carbon dots. Disperse with absolute ethanol to the desired concentration before use, and store at 4°C for later use. The morphology of red and blue dual emission fluorescent carbon dots is as follows: figure 1 As shown, it presents a quasi-spherical morphology with a size distribution between 2 nm and 4 nm. With rhodamine 6G as the reference standard in the range of 600-800 nm, the red and blue dual emission fluorescent carbon dots ...

Embodiment 2

[0066] Example 2: Preparation of Red and Blue Dual Emission Fluorescent Carbon Dots

[0067] Grind 500 mg of Tieguanyin into powder, add it to 10 mL of ethanol solvent, ultrasonicate at room temperature for 10 min, transfer the mixture to a 25 mL autoclave, heat and react at 200 °C for 3 hours, and cool to room temperature naturally after the reaction , centrifuge at 10,000 rpm to remove large particles, then filter with a 0.22 μm microporous membrane, and remove the solvent by rotary evaporation to obtain the red and blue dual-emission fluorescent carbon dots. Disperse with absolute ethanol to the desired concentration before use, and store at 4°C for later use.

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Abstract

The invention relates to red-blue dual-emission fluorescent carbon dots and a fluorometric analysis method for simultaneous detection of Al<3+> and Cu<2+> ions. A preparing method of the carbon dots includes grinding dry tea leaves into powder, adding the powder into a reaction solvent to form a mixture, performing room-temperature ultrasonic treatment, then heating and reacting the mixture at 140-250 DEG C for 1-24 h, naturally cooling a reaction product after the reaction is finished to room temperature, performing centrifugation to remove large particles, then performing filtration with a micropore filter membrane having a particle size of 0.22 [mu]m, and performing rotary evaporation to remove the solvent to obtain the carbon dots. The carbon dots have characteristics of single excitation and dual emission, if fluorescence in a blue fluorescence emitting zone is enhanced, the content of Al<3+> ions can be detected with high sensitivity and high selectivity, and if fluorescence in ared fluorescence emitting zone is quenched, the content of Cu<2+> ions can be detected with high sensitivity and high selectivity, thus achieving simultaneous detection of the two types of ions without interferences.

Description

technical field [0001] The invention relates to a preparation method of fluorescent carbon dots, and detection of Al based on fluorescent carbon dots 3+ Ions and Cu 2+ Ion fluorescence analysis method. Background technique [0002] Aluminum is the most abundant metal element in the earth. Because of its various excellent properties, it is often used in industries such as aerospace aluminum, electronic home appliance aluminum, packaging aluminum and construction aluminum, especially in the food industry. The use of aluminum potassium sulfate and aluminum ammonium sulfate has exposed humans to high aluminum concentration environments for a long time. However, a large number of studies have proved that the intake of aluminum in the human body can cause serious health problems, such as Alzheimer's disease, Parkinson's disease, and kidney failure. Therefore, accurate detection of aluminum ion content is of great significance for food safety and human health. [0003] Copper i...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64B82Y40/00B82Y20/00
Inventor 宋金萍马琦刘慧君郭永冯锋
Owner SHANXI DATONG UNIV
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