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Graphene quantum dot sensor and its application in detection of trinitrophenol

A technology of graphene quantum dots and trinitrophenol, applied in the field of analytical chemistry, to achieve good photochemical stability, broad application prospects, high selectivity and sensitivity

Inactive Publication Date: 2015-12-02
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene quantum dot fluorescent sheet has the advantages of good chemical stability and high fluorescence intensity

Method used

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  • Graphene quantum dot sensor and its application in detection of trinitrophenol
  • Graphene quantum dot sensor and its application in detection of trinitrophenol
  • Graphene quantum dot sensor and its application in detection of trinitrophenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix 2 g of citric acid with 0.5 mL of ammonia water (mass fraction 28%), place in a closed reaction kettle of a microwave heating device, control the temperature at 210° C., and heat for 0.5 hour to obtain nitrogen-doped graphene quantum dots. After the reaction is completed, the fluorescent graphene quantum dots obtained are poured into distilled water, 50 milliliters of distilled water is added for every gram of graphene quantum dots, 5 mL of sodium hydroxide solution is added, the mass fraction of sodium hydroxide solution is 40%, and the pH of the solution is adjusted to 7.0. Transfer the graphene quantum dots to a dialysis bag (35KD), shake and dialyze at room temperature for 24 hours, then wash the product with distilled water and absolute ethanol, and finally dry the purified graphene quantum dots in a vacuum oven at 60°C for 4 hours to obtain the product Graphene quantum dots 1.5g.

Embodiment 2

[0025]Mix 10 mg of the purified graphene quantum dots prepared in Example 1 with 10 mL and 20 mg / mL carboxymethyl chitosan solution at 30° C. for 30 min to obtain a uniformly dispersed solution. The quartz thin plate (size 50mm*10mm*5mm) was boiled at 100°C for 30 minutes with a mixture of sulfuric acid with a mass fraction of 98% and hydrogen peroxide with a mass fraction of 30% (mixed volume ratio 0.5:1) to complete silane group activation. After the quartz thin plate was immersed in the mixed solution of graphene quantum dots and carboxymethyl chitosan for 10 minutes, a thin plate with strong fluorescent signal was obtained. Add 10 mL of sodium phosphate buffer solution (24 g of anhydrous sodium dihydrogen phosphate, 6.9 g of sodium hydroxide, and make 1 L with water) to control pH = 8.0, and then immerse the quartz thin plate in 1 mmol / L creatinine solution for 30 min to complete the graphene A layer of functional molecules is formed on the surface of the quantum dot fluor...

Embodiment 3

[0027] Add 40% sodium hydroxide solution to adjust the pH of the solution to 11.0, rinse with distilled water and dry with nitrogen. Soak the sensor in a series of known concentrations of trinitrophenol solutions for 5 minutes; then rinse the sensor with distilled water and dry it with nitrogen, place it in a fluorescence photometer, and read the emission wavelength at 443nm under the condition of excitation wavelength 353nm Fluorescence intensity value, with the fluorescence intensity as the ordinate and the concentration of trinitrophenol as the abscissa, draw the analytical work curve; then soak the sensor in the solution sample with an unknown concentration of trinitrophenol, and read at an excitation wavelength of 353nm The fluorescence intensity value at the emission wavelength of 443nm is brought into the analysis working curve, so as to obtain the content of trinitrophenol through calculation.

[0028] Or place the sensor contacting the sample of trinitrophenol solutio...

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Abstract

The invention relates to a graphene quantum dot sensor and its application in detection of trinitrophenol, and belongs to the field of analysis chemistry. A making method of the sensor comprises the following steps: mixing citric acid with ammonia water, and heating in a closed microwave digestion device to prepare nitrogen element doped graphene quantum dots; mixing the graphene quantum dots with a carboxymethyl chitosan solution, immersing a quartz thin plate in the obtained graphene quantum dot and carboxymethyl chitosan solution, and carrying out electrostatic force action to form a thin plate with a strong fluorescence signal. Creatinine molecules are adsorbed to the surface of the thin plate to identify trinitrophenol. When the thin plate is in contact with trinitrophenol, the fluorescence signal substantially weakens. The graphene quantum dot fluorescence thin plate chemical sensor made through the method has good photochemical stability, has obvious selection and identification capability on the explosive trinitrophenol, can realize detection of a tiny amount of trinitrophenol (the detection limit is 0.1[mu]g / L), and has wide application prospects in safety detection and environmental protection supervision.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to a graphene quantum dot sensor and its application in detecting trinitrophenol. technical background [0002] The detection and measurement of trace explosives has always been a topic of great concern in the fields of environmental protection and public safety. Trinitrophenol (picric acid) compounds are a class of highly toxic carcinogens that can cause great harm to the environment and the human body, and are also a common explosive. Therefore, the rapid and convenient detection of trinitrophenol is of great significance for maintaining public safety and environmental monitoring. Due to the low vapor pressure and high explosiveness of nitro explosives, the traditional main detection methods include chromatography-mass spectrometry, ion mobility spectrometry and X-ray diffraction equipment, fluorescence and electrochemical methods, but there are problems with slow ...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 马强陈树帆宋煜
Owner JILIN UNIV
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