Preparation method of carbon quantum dot composite material taking terbium-doped sunflower stem pith as carbon source

A technology of carbon quantum dots and composite materials, applied in the field of nano-luminescent material preparation, can solve problems such as lack of application, and achieve the effects of good biocompatibility, small size and simple operation

Active Publication Date: 2020-10-16
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after harvesting sunflower seeds, people often discard other parts of the sunflower or burn them as fuel, which lacks the application in the field of preparation of new carbon materials.

Method used

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  • Preparation method of carbon quantum dot composite material taking terbium-doped sunflower stem pith as carbon source
  • Preparation method of carbon quantum dot composite material taking terbium-doped sunflower stem pith as carbon source

Examples

Experimental program
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Embodiment 1

[0013] (1) Preparation of sunflower stem pith powder: Remove the cortex and xylem from sunflower stems, which are agricultural production wastes, to obtain spongy sunflower stem pith, cut them into pieces, put them in a beaker, add deionized water, and heat in a water bath to boil After cooling to 24±2°C for 20 minutes, wash it repeatedly with deionized water three times, place it in an oven with a temperature of 100±2°C and dry it at a constant temperature for 4 hours, after cooling to 24±2°C, take it out and place it in a high-speed pulverizer After crushing, pass the obtained powder through a 200-mesh sieve to obtain sunflower stem pith powder with a particle size of less than 75 μm. (2) Preparation of carbon quantum dots: In a reaction kettle containing 50ml polytetrafluoroethylene liner, add raw materials according to the following proportions, sunflower stem pith: 2g, sulfuric acid: 6M 30ml, put in an oven at a temperature of 180±2°C React at a medium constant temperatur...

Embodiment 2

[0015] (1) Preparation of sunflower stem pith powder: Remove the cortex and xylem from sunflower stems, which are agricultural production wastes, to obtain spongy sunflower stem pith, cut them into pieces, put them in a beaker, add deionized water, and heat in a water bath to boil After cooling to 24±2°C for 20 minutes, wash it repeatedly with deionized water three times, place it in an oven with a temperature of 100±2°C and dry it at a constant temperature for 4 hours, after cooling to 24±2°C, take it out and place it in a high-speed pulverizer After crushing, pass the obtained powder through a 200-mesh sieve to obtain sunflower stem pith powder with a particle size of less than 75 μm. (2) Preparation of carbon quantum dots: In a reaction kettle containing 50ml polytetrafluoroethylene liner, add raw materials according to the following ratio, sunflower stem pith: 3g, sulfuric acid: 7M 30ml, put in an oven at a temperature of 180±2°C React at a medium constant temperature for ...

Embodiment 3

[0017](1) Preparation of sunflower stem pith powder: Remove the cortex and xylem from sunflower stems, which are agricultural production wastes, to obtain spongy sunflower stem pith, cut them into pieces, put them in a beaker, add deionized water, and heat in a water bath to boil After cooling to 24±2°C for 20 minutes, wash it repeatedly with deionized water three times, place it in an oven with a temperature of 100±2°C and dry it at a constant temperature for 4 hours, after cooling to 24±2°C, take it out and place it in a high-speed pulverizer After crushing, pass the obtained powder through a 200-mesh sieve to obtain sunflower stem pith powder with a particle size of less than 75 μm. (2) Preparation of carbon quantum dots: In a reaction kettle containing 50ml of polytetrafluoroethylene liner, add raw materials according to the following proportions, sunflower stem pith: 4g, sulfuric acid: 8M 30ml, put in an oven at a temperature of 180±2°C React at medium constant temperatur...

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Abstract

The invention discloses a preparation method of a carbon quantum dot composite material taking terbium-doped sunflower stem pith as a carbon source. The preparation method comprises the following steps: uniformly mixing sunflower stem pith and sulfuric acid in proportion, putting an obtained mixture into a reaction kettle, placing the reaction kettle into an oven, regulating the temperature of theoven to 180 + / -2 DEG C, reacting for 6 hours, cooling to 24 + / -2 DEG C, taking out an obtained solution, centrifuging, filtering, adding ammonia water to regulate the pH value to 7.0 + / -0.1, dialyzing and freeze-drying to obtain the carbon quantum dot powder; dissolving the carbon quantum dot powder in water to obtain a solution, uniformly mixing the solution with a terbium nitrate solution in proportion, putting an obtained mixed solution into a reaction kettle, putting the reaction kettle into a drying oven, adjusting the temperature to 160 + / -2 DEG C, reacting for 6 hours, cooling to 24 + / -2 DEG C, taking out an obtained reaction solution, dialyzing, freezing and drying to obtain a powder, namely the terbium-doped sunflower stem pith carbon quantum dot composite material. The preparation method is simple to operate, safe and environment-friendly, the prepared terbium-doped carbon quantum dot has the characteristics of long fluorescence lifetime, small and uniform size, good biocompatibility and the like, and the maximum quantum yield of the rare earth terbium-doped carbon quantum dot is 33.7%.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-luminescent materials, in particular to a method for preparing a composite material of carbon quantum dots doped with terbium doped with sunflower stem pith as a carbon source. Background technique [0002] Carbon quantum dots refer to carbon-based, amorphous and generally spherical nanoparticles with a size between 2nm and 10nm. As the most important material in fluorescent carbon nanomaterials, carbon quantum dots have unique small size characteristics and superior fluorescence properties: carbon quantum dots have bright and stable fluorescence, wide excitation spectrum, narrow emission spectrum, and emission wavelength can be adjusted by changing the material There is no photobleaching phenomenon, and some carbon quantum dots also have up-conversion fluorescence characteristics. Due to the easy functionalization and industrialization of carbon quantum dots, simple preparation proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/77B82Y20/00B82Y40/00
CPCC09K11/7743B82Y20/00B82Y40/00
Inventor 王聪伶赵蔚琳徐郡李慧芝
Owner UNIV OF JINAN
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