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Method for separating and purifying graphene quantum dots by utilizing molecular sieve

A technology of graphene quantum dots and molecular sieves, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of organic extractant hazards, difficulty in selecting organic extractants, etc., and achieve short operation time and great application value , the effect of easy operation

Active Publication Date: 2018-05-29
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the organic extractant of the extraction method has certain hazards, and it is difficult to choose a suitable organic extractant

Method used

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  • Method for separating and purifying graphene quantum dots by utilizing molecular sieve
  • Method for separating and purifying graphene quantum dots by utilizing molecular sieve
  • Method for separating and purifying graphene quantum dots by utilizing molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Step 1, weighing 1 g of FDU-12 molecular sieve with an average pore diameter of 10 nm.

[0024] Step 2, cleaning FDU-12 molecular sieve: first add 100ml deionized water, ultrasonically disperse for 20 minutes; then add 100ml absolute ethanol, ultrasonically disperse for 20 minutes.

[0025] Step 3: Weigh 100 g of the initial graphene quantum dot solution, add the cleaned FDU-12 molecular sieve, and ultrasonically disperse for 30 minutes at room temperature to obtain the reactant. The reactants include graphene quantum dots-molecular sieves, graphene quantum dots of other sizes and impurities.

[0026] Step 4, centrifuging the reactants to obtain graphene quantum dot-molecular sieves containing graphene quantum dots.

[0027] Step five, clean the graphene quantum dot-molecular sieve with 100ml ethanol, and centrifuge to remove ethanol.

[0028] Step 6, adding chloroform to the cleaned graphene quantum dot-molecular sieve as a desorbing agent, heating to 70° C. for 30 m...

Embodiment 2

[0039] Step 1, weighing 1 g of SBA-15 molecular sieve with an average pore diameter of 5 nm.

[0040] Step 2, cleaning SBA-15 molecular sieve: first add 100ml deionized water, ultrasonically disperse for 20 minutes; then add 100ml absolute ethanol, ultrasonically disperse for 20 minutes.

[0041] Step 3: Weigh 10 g of the initial sulfur-nitrogen co-doped graphene quantum dot solution, add the cleaned SBA-15 molecular sieve, and ultrasonically disperse for 30 minutes at room temperature to obtain the reactant. The reactants include sulfur and nitrogen co-doped graphene quantum dots-molecular sieves, sulfur and nitrogen co-doped graphene quantum dots of other sizes and impurities.

[0042] Step 4, centrifuging the reactants to obtain sulfur and nitrogen co-doped graphene quantum dots-molecular sieves containing sulfur and nitrogen co-doped graphene quantum dots.

[0043] Step five, wash the sulfur and nitrogen co-doped graphene quantum dot-molecular sieve with 100ml ethanol, an...

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Abstract

The invention provides a method for separating and purifying graphene quantum dots by utilizing a molecular sieve. The method is characterized by comprising the following steps: step 1, at the room temperature, mixing an initial graphene quantum dot solution with a molecular sieve in a certain proportion to obtain a reactant; step 2, centrifuging the reactant to obtain a graphene quantum dot-molecular sieve containing graphene quantum dots; and step 3, adding a desorbing agent to the graphene quantum dot-molecular sieve, and performing reflux condensation under the condition of 70-100 DEG C soas to desorb the graphene quantum dots. The graphene quantum dots obtained by the method through separation and purification are uniform in particle size distribution, high in purity and high in quantum yield. The method provided by the invention is simple in process, easy to operate and short in operating time; both initial graphene quantum dot solutions prepared by a 'from-top-to-bottom' methodand a 'from-bottom-to-top' method can be separated and purified by the method provided by the invention; and the method provided by the invention can also respectively separate graphene quantum dotswith different particle sizes in the initial graphene quantum dot solutions.

Description

technical field [0001] The invention relates to a method for separating and purifying graphene quantum dots, in particular to a method for using molecular sieves to separate and purify graphene quantum dots. Background technique [0002] Graphene quantum dots are quasi-zero-dimensional nanomaterials with a particle size between 1 and 10nm. They have significant quantum confinement effects and boundary effects, and exhibit good chemical inertness, biocompatibility and low biological toxicity. , applied to biological imaging, disease detection, optoelectronic devices and energy related fields. [0003] The preparation of graphene quantum dots usually adopts two methods: "top-down" and "bottom-up". However, the graphene quantum dots prepared by these two methods all have the problems of uneven particle size distribution and high impurity content. This problem will affect the quality of graphene quantum dots, and then affect the use of graphene quantum dots. Therefore, the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/196C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C01P2004/64C01P2006/60C01P2006/80C09K11/65
Inventor 陈爱英刘莹莹祁鹏王坤王现英
Owner UNIV OF SHANGHAI FOR SCI & TECH
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