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Method for high efficiency preparation of carbon quantum dots by using biomass soot

A technology of carbon quantum dots and biomass, which is applied in the field of efficient preparation of carbon quantum dots, can solve the problems of lack of cheap preparation methods for long-wave emission carbon quantum dots, and achieve the effect of simple and feasible preparation methods, small average particle size and high yield

Inactive Publication Date: 2016-12-21
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of the lack of cheap preparation methods for long-wave emission carbon quantum dots in the existing field of carbon quantum dot preparation, the present invention provides a method for efficiently preparing carbon quantum dots using biomass soot

Method used

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  • Method for high efficiency preparation of carbon quantum dots by using biomass soot
  • Method for high efficiency preparation of carbon quantum dots by using biomass soot
  • Method for high efficiency preparation of carbon quantum dots by using biomass soot

Examples

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Embodiment 1

[0026] Take 50 mg of flue ash from a rural dwelling in Hebei Province in a 50 mL round-bottomed flask, put it into a beaker filled with ice water, slowly add 4 mL of concentrated sulfuric acid into the round-bottomed flask while stirring, and add the acid dropwise After that, continue stirring for 30 min. Stop stirring, sonicate for 2 h, place the round bottom flask in an oil bath, and heat at 100 °C for 24 h. After the sample was naturally cooled to room temperature, it was placed in ice water again, and 25 mL of deionized water was slowly added dropwise under stirring, and K 2 CO 3 Neutralize to pH ≈ 7, centrifuge (12,500 rpm, 30 min), remove the precipitate, transfer the supernatant to a 100 Da dialysis bag, dialyze for 3 to 6 days, discard the dialysate, and transfer the liquid in the bag to 500 Da In the dialysis bag, continue dialysis for 3 to 6 days, retain and concentrate the dialysate, then transfer the liquid in the bag to 1000 Da and 2000 Da dialysis bags in turn,...

Embodiment 2

[0028] On the basis of Example 1, the volume ratio of concentrated nitric acid to concentrated sulfuric acid was adjusted to 1:1 (the total volume was 4 mL), and other conditions remained unchanged.

Embodiment 3

[0030] On the basis of Example 2, the volume ratio of concentrated nitric acid to concentrated sulfuric acid was adjusted to 1:2, and other conditions remained unchanged.

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Abstract

The invention discloses a method for high efficiency preparation of carbon quantum dots by using biomass soot, wherein the method comprises the following specific steps: 1, adding concentrated nitric acid and concentrated sulfuric acid or a mixture of the two components into soot obtained by burning biomass, and carrying out ultrasonic treatment for 1 h-5 h, to obtain a dispersion liquid of the soot; 2, carrying out heating treatment of the dispersion liquid of the soot for 10-36 h at the temperature of 80 to 120 DEG C, naturally cooling to room temperature, then placing the cooled product into ice water, adding ultra pure water, stirring, and adjusting the mixed solution to be neutral with K2CO3, to obtain a crude product; and 3, centrifuging the crude product to filter out a precipitate, carrying out grading dialysis of the filtrate by using dialysis bags with different cut-off molecular weights, concentrating dialysates of all parts, and thus obtaining carbon quantum dot solutions with different size ranges. The selected raw materials are low in price and stable in sources, the preparation process is simple, and obtained carbon quantum dots can emit yellow fluorescence, have high quantum yield, and are suitable for light electric conversion, biological imaging, ion sensing and other fields.

Description

technical field [0001] The invention relates to a method for efficiently preparing carbon quantum dots by utilizing biomass soot, and belongs to the technical field of nanomaterial preparation. Background technique [0002] Carbon quantum dots are a new type of carbon nanomaterials with a particle size of less than 10 nm, which were accidentally discovered in 2004 and successfully prepared for the first time in 2006 ( J. Am. Chem. Soc. , 2004, 126 , 12736; J. Am. Chem. Soc. ,2006, 128 , 7756) became a star material. Compared with semiconductor quantum dots, they have many advantages such as good water solubility, adjustable luminous range, photostability, non-toxicity, biocompatibility, etc., and overcome the shortcomings of high toxicity of semiconductor quantum dots, and are widely used in biological Sensing, cell imaging and other fields. In recent years, the methods for synthesizing carbon quantum dots mainly include arc discharge, electrochemical oxidation, acid ox...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y30/00
CPCB82Y30/00C01P2002/82C01P2004/04C01P2004/64
Inventor 李洪光张庆红孙晓峰阮红
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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