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

A method for making carbon quantum dots from tofu wastewater

A technology for carbon quantum dots and tofu wastewater, which is applied in the field of nanomaterials to achieve the effects of low cost, strong fluorescence and high yield

Active Publication Date: 2019-03-29
YUNNAN UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis method of the present invention can reduce the discharge of high-concentration organic wastewater, solve the problem of environmental pollution caused by the direct discharge of high-concentration organic matter in yellow pulp water, and at the same time obtain water-soluble carbon quantum dots with high fluorescence quantum yields, and realize the purification of soybean product wastewater. Effective utilization and extension of the industrial chain of soybean product production

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 method for making carbon quantum dots from tofu wastewater
  • A method for making carbon quantum dots from tofu wastewater
  • A method for making carbon quantum dots from tofu wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put the tofu yellow pulp water into 12 10 ml test tubes in turn and put them in a centrifuge with a rotating speed of 12000 r / min for 20 min, then take 500 ml of the centrifuged tofu yellow pulp water, and transfer the yellow pulp water solution Put it into a beaker with a volume of 500ml, and place it on a constant temperature heating platform. When the surface temperature of the heating platform rises to 280°C, heat the reaction at a constant temperature for 2 to 5 hours, and then take out the reactant after naturally cooling to room temperature. Add 50 ml of deionized water into the cooled beaker containing the reactants to form a mixed solution; then stir the mixed solution magnetically for 5 minutes, and then ultrasonically for 4 minutes after the stirring is completed, and wait for the mixed solution to stand evenly Finally, take the supernatant, repeat this step 2-3 times; then centrifuge the supernatant at 12000 r / min for 20 min, and take the supernatant again to...

Embodiment 2

[0028]Put the tofu yellow pulp water into 12 10 ml test tubes in turn and put them in a centrifuge with a rotation speed of 12000 r / min for 20 min, then take 300 ml of the centrifuged tofu yellow pulp water, and transfer the yellow pulp water solution Put it into a beaker with a volume of 500ml, and place it on a constant temperature heating platform. When the surface temperature of the heating platform rises to 230°C, heat and react at a constant temperature for 2 to 5 hours, and then cool naturally to room temperature before taking out the reactant. Add 150 ml of the currently configured sodium hydroxide solution at pH=12.35 to the cooled beaker containing the reactants to form a mixed solution; then stir the mixed solution magnetically for 5 minutes, and then sonicate for 4 minutes after the stirring is completed. After the mixture is allowed to stand evenly, take the supernatant, and repeat this step 2 to 3 times; then centrifuge the obtained supernatant at a speed of 12000...

Embodiment 3

[0034] In order to explore the regulation mechanism and method of the fluorescence wavelength of carbon quantum dots, the present invention puts the tofu yellow slurry water into 12 test tubes of 10 ml in turn and puts them into a centrifuge with a rotation speed of 12000 r / min for 20 min, and then takes 300 ml of centrifuged tofu yellow pulp water, transfer the yellow pulp aqueous solution to a beaker with a volume of 500 ml, and place it on a constant temperature heating platform. When the surface temperature of the heating platform rises to 230 ℃, the constant temperature heating reaction 2 After ~5 hours, take out the reactant after natural cooling to room temperature, then add 50 ml of sodium hydroxide solution of PH=12.35 to form a mixed solution in the beaker that is equipped with the reactant and cooled down; The mixture was magnetically stirred for 5 minutes, and then ultrasonicated for 4 minutes after the stirring was completed. After the mixture was allowed to stand ...

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
chemical oxygen demand (mass)aaaaaaaaaa
sizeaaaaaaaaaa
concentrationaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for making carbon quantum dots by using tofu wastewater, and belongs to the technical field of nanometer materials. The method comprises the following steps: using tofu yellow serofluid as a carbon source, carbonizing the organic matter in the yellow serofluid by heating, and synthesizing water-soluble fluorescent carbon quantum dots. The method is characterized in that the yellow serofluid is put into a container and heated at a constant temperature of 200 to 300 DEG C to react for 2 to 5 hours; then the yellow serofluid is naturally cooled, and is added with deionized water or a NaOH solution with concentration of 1.8mg / ml to form a liquid mixture; and then the liquid mixture is magnetically stirred for 4min, and then ultrasonically stirred for 5min, a supernatant is taken after the liquid mixture is uniform by standing, and then the liquid mixture is centrifuged for 20min at a rotational speed of 12000r / min, and a supernatant is taken to obtain a carbon quantum dot aqueous solution capable of emitting blue or green fluorescence under the excitation of ultraviolet light. The raw materials for synthesizing the carbon quantum dots are easy to obtain, the resource is rich, the environment is protected, and the waste is turned into treasure. The synthesized carbon quantum dot has the advantages of high yield, strong fluorescence, good dispersibility and adjustable fluorescence wavelength, and is beneficial to application in the fields of biomedicine, lighting, display devices and the like.

Description

technical field [0001] The invention relates to a method for making carbon quantum dots from tofu wastewater, belonging to the technical field of nanometer materials. Background technique [0002] Carbon quantum dots (carbon quantum dots, CQDs) are carbon nanomaterials discovered in 2004. Carbon quantum dots are the most important kind of fluorescent carbon nanomaterials, which have excellent photoluminescence and electroluminescence properties. Carbon quantum dots have bright fluorescence, high stability, wide excitation spectrum, and narrow emission spectrum. The emission wavelength can be changed by changing the particle size (1-20nm), structural composition or doping type, surface state, edge state, oxidation The degree and the pH value of the solution are regulated, there is no photobleaching phenomenon, and the chemical properties are stable. Some carbon quantum dots also have up-conversion fluorescence characteristics, so they are extremely useful in multicolor imagi...

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 Patents(China)
IPC IPC(8): C01B32/15C09K11/65B82Y40/00B82Y20/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 张晋王鸿
Owner YUNNAN UNIV
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