Graphene quantum dot and ionic liquid compound and application thereof to Cr(VI) detection

A technology of graphene quantum dots and ionic liquids, applied in measuring devices, instruments, fluorescence/phosphorescence, etc., to achieve the effects of stable fluorescence performance, rapid detection, and obvious selective recognition capabilities

Active Publication Date: 2017-01-11
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no research on the direct detection of Cr(VI) anions by modifying graphene quantum dots with ionic liquids.

Method used

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  • Graphene quantum dot and ionic liquid compound and application thereof to Cr(VI) detection
  • Graphene quantum dot and ionic liquid compound and application thereof to Cr(VI) detection
  • Graphene quantum dot and ionic liquid compound and application thereof to Cr(VI) detection

Examples

Experimental program
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Effect test

Embodiment 1

[0064] 1. Preparation of graphene quantum dots-ionic liquid composites

[0065] (1) Hydrothermal synthesis of graphene quantum dots: using 1,3,6-trinitropyrene as the carbon source and sodium hydroxide solution as the medium, the graphene quantum dots rich in hydroxyl groups (OH- GQDs), the obtained graphene quantum dots are purified by suction filtration and dialysis, and finally obtained brown graphene quantum dot solids through freeze-drying.

[0066] Among them, the concentration of 1,3,6-trinitropyrene is 5 mg / mL, the concentration of sodium hydroxide is 5 mg / mL, and the hydrothermal reaction is carried out in a polytetrafluoroethylene autoclave at 200 °C for 4 hours, and the volume of the reaction solution accounts for 30% of still volume, adopt the microporous filter membrane suction filtration of 0.45um, remove unreacted impurity; Product dialysis purification method is; Reaction product is fully dialyzed to remove unreacted small molecule pyrene through the dialysis b...

Embodiment 2

[0083] Testing of actual samples

[0084] Take Jinsha Lake water as an actual sample, add the filtered Jinsha Lake aqueous solution to the concentration of 0.2 mg / mL BMMIBr-GQDs solution prepared in Example 1 at a volume ratio of 1:15, and react in the dark for 12 minutes. Placed in a fluorescence spectrometer, at an excitation wavelength of 470nm, read the fluorescence intensity value at an emission wavelength of 512nm, calculate the percentage reduction of the fluorescence intensity, and then bring it into the standard curve established in Example 1, and calculate the Cr in the actual sample according to the standard curve. (VI) content.

[0085] Calculated: the concentration of Cr(VI) in Jinsha Lake water is 56.8μM. The detection result is close to the determination result (58.3μM) by atomic absorption spectrometry. It shows that the detection method of the present invention can accurately react the Cr(VI) content of the actual sample.

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Abstract

The invention belongs to the field of application of novel materials to analytical chemistry and discloses a graphene quantum dot and ionic liquid compound and application thereof to Cr(VI) detection. A method for preparing the graphene quantum dot and ionic liquid compound includes: mixing graphene quantum dots with ionic liquid, and purifying after reaction to obtain the graphene quantum dot and ionic liquid compound, wherein the complex is 2.0-4.0nm in size and 0.23nm in lattice spacing, and the ionic liquid refers to 1-butyl-3-methylimidazole bromide. The graphene quantum dot and ionic liquid compound BMIMBr-GQDs has a great fluorescence property and more stable in fluorescence property than graphene quantum dots which are not combined with the ionic liquid. In addition, the BMIMBr-GQDs has an evident Cr(VI) selective recognition capability and is capable of realizing rapid and sensitive detection of Cr(VI) in samples.

Description

technical field [0001] The invention relates to the application field of new materials in analytical chemistry, in particular to a graphene quantum dot-ionic liquid compound and its application in detecting Cr(VI). Background technique [0002] Inorganic anions widely exist in the ecosystem, and some inorganic anions are seriously harmful to the environment and human health. Potassium dichromate is widely used in printing, enamel production, glass, and dye industries, and a large amount of Cr(VI) is released into natural water bodies during use. Water-soluble Cr(VI) is usually oxyacid CrO 4 2- 、Cr 2 o 7 2- exist in other forms and transform into each other. [0003] Cr(VI) is an ingestion / inhalation poison, and skin contact may cause allergy; inhalation may cause cancer or cause genetic defects, and has persistent danger to the environment. So far, many methods have been used to determine Cr(VI) in the environment, such as spectrophotometry, liquid chromatography, ato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6402
Inventor 奚凤娜孙雪焦雅洁赵静雯
Owner HUAWEI TEHCHNOLOGIES CO LTD
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