A preparation method of petroleum pitch-based carbon quantum dots and application of the petroleum pitch-based carbon quantum dots prepared by the method

Abstract

The invention relates to a preparation method of a petroleum asphalt-based carbon quantum dot. The preparation method comprises the following steps: (1) adding concentrated nitric acid and concentrated sulfuric acid into petroleum asphalt and carrying out ultrasonic treatment to obtain a dispersion liquid of the petroleum asphalt; (2) heating the dispersion liquid of the petroleum asphalt obtained in the step (1) in an oil bath to reflux, cooling to room temperature, regulating to neutral by using alkali and distilled water to obtain a coarse product; and (3) separating and refining the coarse product obtained in the step (2) to obtain the petroleum asphalt-based carbon quantum dot. According to the preparation method provided by the invention, the carbon quantum dot is prepared by taking common petroleum asphalt as a carbon source. The petroleum asphalt is rich in polycyclic aromatic rings and has graphene-like condensed ring structures. After chemical oxidization, besides oxygen-containing functional groups at the edge, a petroleum asphalt nanosheet further has carbine-like zigzag structure and carbine-like armchairs structures.

Description

technical field

[0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method of petroleum pitch-based carbon quantum dots and an application of the petroleum pitch-based carbon quantum dots prepared by the method. Background technique

[0002] Carbon quantum dots (Carbon quantum dots) have some unique and novel properties, such as size and excitation wavelength dependence of fluorescence properties, good thermal / chemical stability, no photobleaching, low toxicity, and good biocompatibility etc., making it have broad application prospects in biological imaging, fluorescence sensing, photocatalysis and organic photovoltaic devices.

[0003] At present, there are many methods for preparing carbon quantum dots, such as laser digestion of graphite, electrochemical graphite oxidation, electrochemical soaking of carbon nanotubes, hydrothermal oxidation of small molecule precursors, vapor deposition of soot, proto...

Examples

Embodiment 1

[0035] Weigh 2g of AH-70 at room temperature and put it into a 100ml flask, add 20ml of concentrated nitric acid and 60ml of concentrated sulfuric acid in sequence, then put the flask into a 700w ultrasonic cleaner for 10h to obtain a dispersion of petroleum asphalt; The petroleum asphalt dispersion was heated and refluxed in an oil bath at 100°C for 12 hours, cooled to room temperature, and adjusted to neutrality with NaOH and distilled water to obtain a crude product of carbon quantum dots; After filtering, the filtered solution was dialyzed for 72 hours at room temperature in a dialysis bag with a residual molecular weight of 3500 Da to obtain an aqueous solution of petroleum pitch carbon quantum dots. The prepared petroleum pitch-based carbon quantum dot aqueous solution can be further subjected to rotary evaporation to remove most of the water, and then centrifugally dried to obtain solid petroleum pitch-based carbon quantum dots.

[0036] The petroleum pitch carbon quant...

Embodiment 2

[0038] Weigh 2g of AH-70 at room temperature and put it into a 100ml flask, add 20ml of concentrated nitric acid and 60ml of concentrated sulfuric acid in sequence, then put the flask into a 700w ultrasonic cleaner for 10h to obtain a dispersion of petroleum asphalt; The petroleum asphalt dispersion was heated and refluxed in an oil bath at 100°C for 24 hours, cooled to room temperature, and adjusted to neutrality with NaOH and distilled water to obtain a crude product of carbon quantum dots; After filtering, the filtered solution was dialyzed for 72 hours at room temperature in a dialysis bag with a molecular weight cut-off of 1000 Da to obtain an aqueous solution of petroleum pitch carbon quantum dots. The prepared petroleum pitch-based carbon quantum dot aqueous solution can be further subjected to rotary evaporation to remove most of the water, and then freeze-dried to obtain solid petroleum pitch-based carbon quantum dots.

[0039] Described petroleum pitch carbon quantum...

Embodiment 3

[0041] Weigh 2g of AH-70 asphalt at room temperature and put it into a 100ml flask, add 30ml of concentrated nitric acid and 60ml of concentrated sulfuric acid in turn, then put the flask into a 1000w ultrasonic cleaner for 2 hours to obtain a dispersion of petroleum asphalt; The above-mentioned petroleum asphalt dispersion was heated and refluxed in an oil bath at 100°C for 12 hours, cooled to room temperature, and adjusted to neutrality with NaOH and distilled water to obtain a crude product of carbon quantum dots; the obtained crude product was first filtered through a 0.22 μm microporous membrane After filtering, the filtered solution was dialyzed for 72 hours at room temperature in a dialysis bag with a molecular weight cut-off of 3500 Da to obtain an aqueous solution of petroleum pitch carbon quantum dots. The prepared petroleum pitch-based carbon quantum dot aqueous solution can be further subjected to rotary evaporation to remove most of the water, and then centrifugall...

technical field

[0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method of petroleum pitch-based carbon quantum dots and an application of the petroleum pitch-based carbon quantum dots prepared by the method. Background technique

[0002] Carbon quantum dots (Carbon quantum dots) have some unique and novel properties, such as size and excitation wavelength dependence of fluorescence properties, good thermal / chemical stability, no photobleaching, low toxicity, and good biocompatibility etc., making it have broad application prospects in biological imaging, fluorescence sensing, photocatalysis and organic photovoltaic devices.

[0003] At present, there are many methods for preparing carbon quantum dots, such as laser digestion of graphite, electrochemical graphite oxidation, electrochemical soaking of carbon nanotubes, hydrothermal oxidation of small molecule precursors, vapor deposition of soot, proto...

Examples

Embodiment 1

[0035] Weigh 2g of AH-70 at room temperature and put it into a 100ml flask, add 20ml of concentrated nitric acid and 60ml of concentrated sulfuric acid in sequence, then put the flask into a 700w ultrasonic cleaner for 10h to obtain a dispersion of petroleum asphalt; The petroleum asphalt dispersion was heated and refluxed in an oil bath at 100°C for 12 hours, cooled to room temperature, and adjusted to neutrality with NaOH and distilled water to obtain a crude product of carbon quantum dots; After filtering, the filtered solution was dialyzed for 72 hours at room temperature in a dialysis bag with a residual molecular weight of 3500 Da to obtain an aqueous solution of petroleum pitch carbon quantum dots. The prepared petroleum pitch-based carbon quantum dot aqueous solution can be further subjected to rotary evaporation to remove most of the water, and then centrifugally dried to obtain solid petroleum pitch-based carbon quantum dots.

[0036] The petroleum pitch carbon quant...

Embodiment 2

[0038] Weigh 2g of AH-70 at room temperature and put it into a 100ml flask, add 20ml of concentrated nitric acid and 60ml of concentrated sulfuric acid in sequence, then put the flask into a 700w ultrasonic cleaner for 10h to obtain a dispersion of petroleum asphalt; The petroleum asphalt dispersion was heated and refluxed in an oil bath at 100°C for 24 hours, cooled to room temperature, and adjusted to neutrality with NaOH and distilled water to obtain a crude product of carbon quantum dots; After filtering, the filtered solution was dialyzed for 72 hours at room temperature in a dialysis bag with a molecular weight cut-off of 1000 Da to obtain an aqueous solution of petroleum pitch carbon quantum dots. The prepared petroleum pitch-based carbon quantum dot aqueous solution can be further subjected to rotary evaporation to remove most of the water, and then freeze-dried to obtain solid petroleum pitch-based carbon quantum dots.

[0039] Described petroleum pitch carbon quantum...

Embodiment 3

[0041] Weigh 2g of AH-70 asphalt at room temperature and put it into a 100ml flask, add 30ml of concentrated nitric acid and 60ml of concentrated sulfuric acid in turn, then put the flask into a 1000w ultrasonic cleaner for 2 hours to obtain a dispersion of petroleum asphalt; The above-mentioned petroleum asphalt dispersion was heated and refluxed in an oil bath at 100°C for 12 hours, cooled to room temperature, and adjusted to neutrality with NaOH and distilled water to obtain a crude product of carbon quantum dots; the obtained crude product was first filtered through a 0.22 μm microporous membrane After filtering, the filtered solution was dialyzed for 72 hours at room temperature in a dialysis bag with a molecular weight cut-off of 3500 Da to obtain an aqueous solution of petroleum pitch carbon quantum dots. The prepared petroleum pitch-based carbon quantum dot aqueous solution can be further subjected to rotary evaporation to remove most of the water, and then centrifugall...

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