A carbon quantum dot preparing method

A technology of carbon quantum dots and dry matter, which is applied in the field of preparation of carbon quantum dots, can solve the problems of low yield of carbon quantum dots, many impurities of carbon quantum dots, and is not suitable for wide application, etc., to achieve excellent chemical stability, reduce Production cost, the effect of easy promotion and application

Inactive Publication Date: 2017-03-15
GUANGXI FORESTRY RES INST
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the carbon-containing precursors of carbon quantum dots prepared by hydrothermal method include glucose, citric acid, amino acid, nucleic acid, ascorbic acid, etc. These reagents are expensive and not suitable for wide application; there are also or...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A carbon quantum dot preparing method
  • A carbon quantum dot preparing method
  • A carbon quantum dot preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing carbon quantum dots, comprising the following steps:

[0033] Pretreatment of raw materials: Clean the waste paper in an ultrasonic cleaning machine. The solvent for the first cleaning is ethanol, and the cleaning time is 5 minutes. The solvent for the second cleaning is deionized water, and the cleaning time is 20 minutes. Dried under hot air to obtain a dried product with a moisture content of 3%;

[0034] Hydrothermal reaction: put 1g of dry matter in an autoclave, add 45mL of 2.3mol / L NaOH solution, seal it, then put the autoclave in an oven, and conduct a hydrothermal reaction at 210°C for 3h;

[0035] Filtration: After the autoclave is cooled, take it out, and filter the mixed solution in the autoclave with double-layer filter paper to obtain the filtrate;

[0036] Centrifugation: centrifuge the filtrate at a speed of 14500r / min for solid-liquid separation for 15min, filter to obtain the supernatant;

[0037] Dialysis: Put the supernatant ...

Embodiment 2

[0041] A method for preparing carbon quantum dots, comprising the following steps:

[0042] Pretreatment of raw materials: Clean the waste paper in an ultrasonic cleaning machine. The solvent for the first cleaning is ethanol, and the cleaning time is 10 minutes. The solvent for the second cleaning is deionized water, and the cleaning time is 25 minutes. Dried under hot air to obtain a dried product with a moisture content of 5%;

[0043] Hydrothermal reaction: put 1.2g of dry matter in an autoclave, add 50mL of 2.5mol / L NaOH solution, seal it, then put the autoclave in an oven, and conduct a hydrothermal reaction at 220°C for 3.5h;

[0044] Filtration: After the autoclave is cooled, take it out, and filter the mixed solution in the autoclave with double-layer filter paper to obtain the filtrate;

[0045] Centrifugation: centrifuge the filtrate at a speed of 15000r / min for solid-liquid separation for 20min, filter to obtain the supernatant;

[0046] Dialysis: Put the superna...

Embodiment 3

[0049] A method for preparing carbon quantum dots, comprising the following steps:

[0050] Pretreatment of raw materials: Clean the waste paper in an ultrasonic cleaning machine. The solvent for the first cleaning is ethanol, and the cleaning time is 8 minutes. The solvent for the second cleaning is deionized water, and the cleaning time is 23 minutes. Under hot air drying, the dried product with a moisture content of 4% is obtained;

[0051] Hydrothermal reaction: put 1.1g of dry matter in an autoclave, add 48mL of 2.4mol / L NaOH solution, seal it, then put the autoclave in an oven, and conduct a hydrothermal reaction at 215°C for 3.25h;

[0052] Filtration: After the autoclave is cooled, take it out, and filter the mixed solution in the autoclave with double-layer filter paper to obtain the filtrate;

[0053] Centrifugation: centrifuge the filtrate at a speed of 14500r / min for solid-liquid separation for 18min, filter to obtain the supernatant;

[0054] Dialysis: Put the sup...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

A carbon quantum dot preparing method is disclosed. The method includes cleaning a carbon-containing precursor in an ultrasonic cleaner, drying the carbon-containing precursor to obtain a dried product, adding the dried product to an autoclave, adding a NaOH solution, sealing the autoclave, putting the autoclave to a drying oven, performing a hydrothermal reaction, taking the autoclave out after the autoclave is cooled, filtering a liquid mixture in the autoclave with double layers of filter paper to obtain a filtrate, centrifuging and filtering the filtrate to obtain a supernatant liquid, adding the supernatant liquid into a dialysis bag, performing dialysis, putting the dialyzate in the dialysis bag to a freeze-drying oven, and freeze-drying the dialyzate to obtain solid carbon quantum dots. According to the method, waste paper, waste cloth or waste cotton which are wide in source, economical and environment friendly are adopted as the carbon-containing precursor, and the quantum dots prepared by a hydrothermal process and through steps of filtration, centrifugation, dialysis, and the like are high in yield, uniform in structure and good in dispersibility.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method of carbon quantum dots. Background technique [0002] As a new type of fluorescent carbon nanomaterial, carbon quantum dots are composed of sp2 hybridized carbon atoms on the surface and sp3 carbon atoms inside. The surface of the carbon quantum dots obtained in the experiment has a large number of functional groups such as hydroxyl and carboxyl groups. The existence of these functional groups makes the content of carbon in the carbon quantum dots relatively low, while the content of oxygen is relatively high. Compared with traditional semiconductor quantum dots (such as CdSe, CdTe, CdS, GaAs and InAs, etc.), carbon quantum dots are non-toxic and environmentally friendly, have good water solubility, low preparation cost, good physical and chemical stability, and are easy to chemically modify their surface. Modification, and more impor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C09K11/65C01B32/15B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/65B82Y20/00B82Y30/00B82Y40/00C01P2002/01C01P2002/80C01P2004/64
Inventor 谷瑶王美玲李桂珍周丽珠
Owner GUANGXI FORESTRY RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap