Method for preparing graphene quantum dots on basis of leather waste

A graphene quantum dot and waste technology, applied in the field of nanomaterials, can solve problems such as resource waste and environmental pollution, and achieve the effects of low-cost preparation and good application prospects

Pending Publication Date: 2017-11-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As far as the leather industry is concerned, only 20% of the raw leather is transformed into finished leather through a series of processing in the traditional tanning process. China produces more than 1.4 million tons of leather waste every year, which not only causes a waste of resources, but also It also pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The delimed waste is crushed to obtain crumbs. Take 1 g of the treated delimed skin scraps, add 100 mL of distilled water, and then add 2 g of hydrazine hydrate (80 wt %), and then ultrasonicate at 300 W for 15 min to obtain a dispersion. The dispersion liquid was added into a polytetrafluoroethylene reactor, and a hydrothermal reaction was carried out at 200° C. for 5 hours to obtain product A. The product A was suction-filtered with a 0.22 μm filter membrane to obtain an aqueous dispersion of graphene quantum dots, which was dialyzed and freeze-dried to obtain graphene quantum dots.

[0030] The graphene quantum dots obtained in this example have good water solubility, and the aqueous dispersion of graphene quantum dots exhibits very strong blue and yellow fluorescence under 365nm and 420nm light.

Embodiment 2

[0032] The delimed waste is crushed to obtain crumbs. Weigh 6 g of delimed bark debris, add 200 mL of distilled water, and then add 3 g of 80 wt % hydrazine hydrate, then ultrasonically treat at 500 W for 20 min to obtain a dispersion. The dispersion liquid was added into a polytetrafluoroethylene reactor, and a hydrothermal reaction was carried out at 180° C. for a reaction time of 3 hours to obtain product A. The product A is suction-filtered with a 0.22 μm filter membrane to obtain an aqueous dispersion of graphene quantum dots, and the graphene quantum dots are obtained after dialysis and freeze-drying.

[0033] The graphene quantum dots obtained in this example have good water solubility, and the aqueous dispersion of graphene quantum dots exhibits very strong blue fluorescence under 365nm light.

Embodiment 3

[0035] The delimed waste is crushed to obtain crumbs. Weigh 4 g of delimed bark debris, add it into 300 mL of distilled water, and then add 4 g of 80 wt % hydrazine hydrate, and then ultrasonically treat it at 400 W for 10 min to obtain a dispersion. The dispersion liquid was added into a polytetrafluoroethylene reactor, and the hydrothermal reaction was carried out at 230° C. for 6 hours to obtain the product A. The product A is suction-filtered with a 0.22 μm filter membrane to obtain an aqueous dispersion of graphene quantum dots, which is then subjected to dialysis and freeze-drying to obtain graphene quantum dots.

[0036] The graphene quantum dots obtained in this example have good water solubility, and the aqueous dispersion of graphene quantum dots exhibits very strong blue fluorescence under 365nm light.

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PUM

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Abstract

The invention discloses a method for preparing graphene quantum dots on the basis of leather waste. The method comprises steps as follows: the leather waste is subjected to crushing treatment, and scraps are obtained; 1-6 parts by mass of scraps are taken and put in 100-300 parts by mass of distilled water, 2-4 parts by mass of hydrazine hydrate are added to the distilled water, a mixed solution is subjected to ultrasonic treatment, and a dispersion liquid is obtained; the dispersion liquid is added to a polytetrafluoroethylene reaction kettle and subjected to a hydrothermal reaction, and a product A is obtained; the product A is subjected to suction filtration, and a graphene quantum dot aqueous dispersion is obtained. According to the characteristic that leather collagen fibers contain carbon and nitrogen, hydrothermal preparation of the doped graphene quantum dots is realized, and the leather waste is taken as a raw material, so that the low-cost preparation of the graphene quantum dots is realized.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing graphene quantum dots based on leather waste. Background technique [0002] Graphene quantum dots are a kind of fluorescent materials, which have good chemical stability, anti-photobleaching, biocompatibility and other characteristics. In addition to the above-mentioned characteristics of graphene quantum dots, which have attracted extensive attention in the fields of chemistry, materials, physics, and biology, their preparation methods have also become a research hotspot. The preparation methods of graphene quantum dots are mainly divided into two categories: top-down method and bottom-up method. The top-down method is to prepare graphene quantum dots by cutting carbon materials such as graphene and carbon fibers by chemical etching, electrochemical oxidation stripping, oxygen plasma treatment and other methods. The bottom-up meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C09K11/65
CPCC09K11/65
Inventor 张文博马建中卫林峰鲍艳王转转
Owner SHAANXI UNIV OF SCI & TECH
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