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Preparation of carbon quantum dots based on coal tar pitch and detection method of hcho

A technology of coal tar pitch and carbon quantum dots, which is applied in the application field of fluorescent carbon nanomaterials, can solve the problem of high detection limit, and achieve the effect of simple method, high detectability and uniform particle size distribution

Inactive Publication Date: 2019-04-05
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Mainly detect Cu in water 2+ or Hg 2+ etc.; Fe in human cells 3+ etc. There is little research on the detection of formaldehyde, and the detection limit is relatively high

Method used

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  • Preparation of carbon quantum dots based on coal tar pitch and detection method of hcho
  • Preparation of carbon quantum dots based on coal tar pitch and detection method of hcho
  • Preparation of carbon quantum dots based on coal tar pitch and detection method of hcho

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Experimental program
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Effect test

Embodiment 1

[0026] Take 1g of coal tar pitch and grind it to about 40 μm in a coffee machine, add a small amount of deionized water and pass it through a 500rpm ball mill for ball milling for 4 hours, transfer it to a three-necked flask, add 50mL of 10% hydrogen peroxide, and reflux and condense at 60°C for 6 hours After the reaction, the product was centrifuged in a high-speed centrifuge at 18,000rpm for 20 minutes, and the supernatant was taken, and was rotary evaporated to a solid at 70°C, and dried in a vacuum oven for 12 hours to obtain light yellow carbon quantum dot powder.

Embodiment 2

[0028] Take 1g of coal tar pitch and grind it to about 40μm in a coffee machine, add a small amount of deionized water and pass it through a 500rpm ball mill for ball milling for 4h, transfer it to a three-necked flask, add 50mL of 20% hydrogen peroxide, and reflux and condense at 60°C for 6h After the reaction, the product was centrifuged in a high-speed centrifuge at 15,000rpm for 20min, and the supernatant was taken, and was rotary evaporated to a solid at 70°C, and dried in a vacuum oven for 12h to obtain light yellow carbon quantum dot powder.

Embodiment 3

[0030] Take 1g of coal tar pitch and grind it to about 40μm in a coffee machine, add a small amount of deionized water and pass it through a 500rpm ball mill for ball milling for 4h, transfer it to a three-necked flask, add 50mL of 20% hydrogen peroxide, and reflux and condense at 60°C for 6h After the reaction, the product was centrifuged in a high-speed centrifuge at 18,000rpm for 30 minutes, and the supernatant was taken, and was rotary evaporated to a solid at 70°C, and dried in a vacuum oven for 12 hours to obtain light yellow carbon quantum dot powder.

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Abstract

The invention belongs to the technical field of application of fluorescent carbon nano materials and provides preparation of carbon quantum dots based on coal tar asphalt and a detection method for HCHO. The preparation method includes the steps of adding the coal tar asphalt to deionized water and performing ball milling and ultrasonic dispersion treatments to produce the carbon quantum dot dispersion liquid, wherein the mass ratio of the coal tar asphalt to hydrogen peroxide is 1:30-100; and performing H2O2 oxidization, high-speed centrifugation and vacuum drying to the carbon quantum dot dispersion liquid to produce carbon quantum dot powder. The method employs low-cost raw materials and is simple and green and pollution-free. The carbon quantum dots have good water solubility and have uniform particle size distribution, average size being about 3 nm. Selective detection on HCHO is achieved. The carbon quantum dots are low in detection limit on the HCHO, which is 0-50 [mu]M. Change between fluorescent intensity and concentration of HCHO has excellent linear relationship. The detection limit is lower than 1 ppb and high detection precision is achieved.

Description

technical field [0001] The invention belongs to the technical field of application of fluorescent carbon nanometer materials, and in particular relates to a green preparation of carbon quantum dots based on coal tar pitch and a detection method of HCHO. Background technique [0002] Formaldehyde is a toxic substance that has been widely used in building materials, preservatives or disinfectants in paints, coatings or cosmetics, and has become one of the important environmental pollutants. Excessive formaldehyde breathed by the human body has a strong carcinogenic and carcinogenic effect Even death, the formaldehyde in the air mainly comes from the raw materials for decoration, and the formaldehyde in food mainly comes from preservatives. Traditional detection methods, such as ICP-MS, voltammetry, optical sensing, derivatization, etc., are less sensitive High, but the operation is loaded down with trivial details, and the instrument used is expensive, so it is crucial to need...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C01B32/15B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C01P2004/64C01P2006/60C09K11/65G01N21/6428G01N21/643
Inventor 郝策李跃辉李光兰
Owner DALIAN UNIV OF TECH
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