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Method for separating graphene quantum dots by using molecular sieve

A technology of graphene quantum dots and molecular sieves, applied in graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of organic extractant harm, difficulty in selecting organic extractant, etc., and achieve the effect of uniform distribution and high purity

Pending Publication Date: 2020-07-17
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 graphene quantum dots by using molecular sieve
  • Method for separating graphene quantum dots by using molecular sieve
  • Method for separating graphene quantum dots by using molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1: Weigh 50 mg of MCM-41 molecular sieve with an average pore diameter of 4 nm, and put it into a syringe for compaction.

[0040] Step 2, take 3ml of centrifuged initial graphene quantum dots and put them into the syringe in step 1.

[0041] Step 3, squeeze the syringe, press the solution out of the syringe, and obtain graphene quantum dots with a size of 0-4nm.

[0042] Step 4, add 2-3ml of absolute ethanol to the syringe to separate from the remaining molecular sieve, and squeeze the liquid in the syringe out of the syringe. Repeat the above operation 3-5 times.

[0043] Compared with the fluorescence emission spectrum of the initial graphene quantum dot solution (attached Figure 4 ), the obtained quantum dot size is 410nm for the graphene quantum dot solution whose emission wavelength is 0-4nm, and the wavelength in the original solution is that the emission peak at the 510nm place disappears (see appendix image 3 ). It was shown that graphene quantum dot...

Embodiment 2

[0045] Step 1: Weigh 100 mg of SBA-15 molecular sieve with an average pore diameter of 8 nm, and put it into a syringe for compaction.

[0046] Step 2, take 3ml of centrifuged initial graphene quantum dots and put them into the syringe in step 1.

[0047] Step 3, squeeze the syringe, press the solution out of the syringe, and obtain graphene quantum dots with a size of 0-8nm.

[0048] Step 4, add 2-3ml of absolute ethanol to the syringe to separate from the remaining molecular sieve, and squeeze the liquid in the syringe out of the syringe. Repeat the above operation 3-5 times.

[0049] Step 5: Take out the remaining mixture of molecular sieve and graphene quantum dots in the syringe, and elute the large-sized quantum dots adsorbed on the molecular sieve by means of centrifugation, ultrasound, and heating to obtain a solution of graphene quantum dots with a size greater than 8nm.

[0050]Step 5, taking out the remaining mixture of molecular sieve and graphene quantum dots in...

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Abstract

The invention provides a method for separating graphene quantum dots by using a molecular sieve. A graphene quantum dot solution is injected into a compacted molecular sieve, quantum dots with relatively small particle sizes penetrate through apertures of the molecular sieve along with a solvent through a physical method, and the graphene quantum dots similar to the apertures of the molecular sieve can enter the molecular sieve to form a graphene quantum dot-molecular sieve; the graphene quantum dots with the pore diameter larger than that of the molecular sieve can be remained on the molecular sieve, so that the size separation of the graphene quantum dots is realized. The graphene quantum dots in the graphene quantum dot-molecular sieve can be separated from the molecular sieve under theaction of ultrasound and a desorption agent, the obtained quantum dot solution with the remaining size can be separated again, and the graphene quantum dots which are uniform in distribution, high inpurity and target in size are obtained.

Description

technical field [0001] The invention relates to the technical field of graphene quantum dot separation and size control, in particular to a method for separating graphene quantum dots using molecular sieves 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 pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194C09K11/65B82Y20/00
CPCC01B32/194C09K11/65B82Y20/00C01B2204/32
Inventor 陈爱英王现英李梅
Owner UNIV OF SHANGHAI FOR SCI & TECH
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