Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing carbon quantum dots from lignin, and product

A technology of carbon quantum dots and lignin, which is applied in the field of carbon quantum dot preparation, can solve the problems of reaction equipment with pressure resistance requirements, increased equipment investment, and high production costs, so as to improve the dissolution and dispersion rate, increase the yield, and prevent agglomeration Effect

Inactive Publication Date: 2019-07-26
HUAZHONG UNIV OF SCI & TECH
View PDF8 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the synthesis of carbon quantum dots through lignin. The reason is that the connecting bonds between lignin monomers are C-C bonds, which have high bond energy and cannot be broken under mild conditions to participate in the synthesis reaction of quantum dots.
Patent No. CN109054825A discloses a fluorescent carbon quantum dot and its high-efficiency preparation method. It obtains fluorescent carbon quantum dots by hydrothermally treating biomass raw materials in a 1Mpa reactor for 12 hours. However, this method needs to be carried out under a high pressure of 1Mpa. There is a pressure-resistant requirement for the reaction equipment, which increases equipment investment and generates higher costs

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
  • Method for preparing carbon quantum dots from lignin, and product
  • Method for preparing carbon quantum dots from lignin, and product
  • Method for preparing carbon quantum dots from lignin, and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (a) Weigh 100 mg of lignin and place it in 100 mL of ultrapure water to obtain a lignin solution with a concentration of 1 mg / mL, then put the lignin solution into an ultrasonic wave with a power of 60 W and a frequency of 40 Hz for 10 minutes to make it completely Dissolve, then add 10mL hydrogen peroxide at a volume ratio of 1:10, place the lignin solution containing hydrogen peroxide in an ultrasonic generator with a power of 60w and a frequency of 40 Hz for 20 minutes, and use ultrasound to decompose the lignin and completely dissolved to obtain a small molecule lignin solution;

[0037] (b) Transfer the small molecule lignin solution to a hydrothermal reaction kettle with a polytetrafluoroethylene liner, ensure that the stirring rate is 200r / min, conduct a hydrothermal treatment at 200°C for 12 hours, and cool to room temperature after the reaction is completed to obtain dark brown liquid product;

[0038] (c) The obtained liquid product is transferred to a power ...

Embodiment 2

[0043] (a) Weigh 2g of lignin and place it in 100mL of ultrapure water to obtain a lignin solution with a concentration of 20mg / mL, then put the lignin solution into an ultrasonic wave with a power of 60w and a frequency of 40 Hz for 30 minutes to make it completely Dissolve, then add 25mL hydrogen peroxide at a volume ratio of 1:4, place the lignin solution containing hydrogen peroxide in an ultrasonic generator with a power of 60w and a frequency of 40 Hz for 30 minutes, and decompose the lignin by ultrasonic and completely dissolved to obtain a small molecule lignin solution;

[0044] (b) Transfer the small molecule lignin solution to a hydrothermal reaction kettle with a polytetrafluoroethylene liner, ensure that the stirring rate is 300r / min, conduct hydrothermal treatment at 250°C for 24 hours, and cool to room temperature after the reaction is completed to obtain dark brown liquid product;

[0045] (c) transfer the obtained liquid product to a power of 60w, a frequency...

Embodiment 3

[0048] (a) Weigh 500 mg of lignin and place it in 100 mL of ultrapure water to obtain a lignin solution with a concentration of 5 mg / mL, then put the lignin solution into an ultrasonic wave with a power of 60 W and a frequency of 40 Hz for 10 minutes to make it completely Dissolve, then add 5mL of concentrated sulfuric acid according to the volume ratio of 1:20, place the lignin solution containing concentrated sulfuric acid in an ultrasonic generator with a power of 60w and a frequency of 40 Hz for 10 minutes, and use ultrasound to decompose the lignin and completely Dissolving to obtain a small molecule lignin solution;

[0049] (b) Transfer the small molecule lignin solution to a hydrothermal reaction kettle with a polytetrafluoroethylene liner, ensure that the stirring rate is 100r / min, conduct a hydrothermal treatment at 150°C for 2 hours, and cool to room temperature after the reaction is completed to obtain dark brown liquid product;

[0050] (c) The obtained liquid pr...

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
concentrationaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of preparation of carbon quantum dots, and specifically discloses a method for preparing the carbon quantum dots from lignin, and a product. The method includes adding the lignin to water to obtain a lignin solution, and adding an activator for ultrasonic treatment to obtain a micromolecular lignin solution; subjecting the micromolecular lignin solution to hydro-thermal treatment at 150-250 DEG C, and cooling down to room temperature after reaction to obtain a liquid product; ultrasonically treating the liquid product, and preforming filtering and dialyzing to obtain a carbon quantum dot solution; and freeze-drying the carbon quantum dot solution to obtain the carbon quantum dots. The method has the advantages that the lignin can be sufficiently utilizedthrough reduction of reaction activation energy of the lignin, the production cost is reduced while the yield and quality of the carbon quantum dots are improved, and the yield of the finally obtainedcarbon quantum dots can reach 35% through control of reaction conditions.

Description

technical field [0001] The invention belongs to the field of carbon quantum dot preparation, and more specifically relates to a method and product for preparing carbon quantum dots by using lignin. Background technique [0002] Carbon quantum dots are a new type of zero-dimensional carbon nanomaterials, whose size is below 10nm in three dimensions, so they exhibit stronger nano-characteristics than other nanomaterials. Carbon quantum dots have excellent optical properties, and at the same time have many advantages such as low toxicity, environmental friendliness, wide source of raw materials, low cost, and good biocompatibility, so they are widely used in medical imaging technology, environmental monitoring, chemical analysis, It is a new type of high value-added carbon material in many fields such as catalyst preparation and energy development. [0003] The synthesis methods of carbon quantum dots include arc discharge method, electrochemical method, laser etching method, ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15
CPCC01B32/15
Inventor 杨海平李建陈应泉陈伟陈旭邵敬爱杨晴曾阔王贤华张世红陈汉平
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com