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Preparation method and application of water-soluble carbon quantum dots based on eggshell membranes

A technology of carbon quantum dots and eggshell membranes, applied in the field of preparation of fluorescent carbon quantum dots, can solve the problems of high energy consumption, complex preparation process, long time consumption, etc., and achieve the effects of low energy consumption, abundant sources and simple equipment

Active Publication Date: 2016-10-26
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the Chinese invention patent with application number 201110049051.X discloses a method for preparing carbon quantum dots using plant stems as raw materials. -12 hours, the dry product reacts with ethylene glycol at high temperature for 48-72 hours and then centrifuges to obtain carbon dots. Although the raw materials used in this method are cheap and easy to obtain, the preparation process is complicated and time-consuming, especially the energy consumption is high.

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  • Preparation method and application of water-soluble carbon quantum dots based on eggshell membranes
  • Preparation method and application of water-soluble carbon quantum dots based on eggshell membranes
  • Preparation method and application of water-soluble carbon quantum dots based on eggshell membranes

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Embodiment 1

[0025] The preparation method steps of the eggshell membrane-based water-soluble carbon quantum dots of the present embodiment are as follows:

[0026] Peel the eggshell membrane from the inner wall of the eggshell, wash it three times with distilled water, dry it in an oven at 70°C, and cut it into pieces to obtain eggshell membrane fragments with a particle size of 30 mesh. Take 1.0 g of the fragmented eggshell membrane and place it in 20 mL Sodium hydroxide solution (0.2 mol / L), transfer the dispersion to a hydrothermal synthesis kettle whose inner wall is made of polytetrafluoroethylene, seal the reaction kettle and place it in an oven at 180°C for 9 hours, and wait for the reaction kettle to cool naturally The reaction solution was centrifuged (10000rpm) for 10min to remove impurities, the supernatant was placed in a dialysis bag with a molecular weight cut-off of 1000Da and dialyzed for 12 hours, and the product solution was freeze-dried at -80 degrees and then vacuum-dri...

Embodiment 2

[0029] The preparation method steps of the water-soluble carbon quantum dots based on the eggshell membrane of the present embodiment are as follows:

[0030] Peel the eggshell membrane from the inner wall of the eggshell, wash it three times with distilled water, dry it in an oven at 70°C, and cut it into pieces to obtain eggshell membrane fragments with a particle size of 50 mesh. Take 1.0 g of the fragmented eggshell membrane and place it in 50 mL Sodium hydroxide solution (0.1 mol / L), transfer the dispersion to a hydrothermal synthesis kettle whose inner wall is made of polytetrafluoroethylene, seal the reaction kettle and place it in an oven at 200°C for 6 hours, and wait for the reaction kettle to cool naturally The reaction solution was centrifuged (10000rpm) for 15min to remove impurities, the supernatant was placed in a dialysis bag with a molecular weight cut-off of 2000Da and dialyzed for 12 hours, the product solution was freeze-dried and vacuum-dried to obtain a po...

Embodiment 3

[0033] The preparation method steps of the water-soluble carbon quantum dots based on the eggshell membrane of the present embodiment are as follows:

[0034] Peel the eggshell membrane from the inner wall of the eggshell, wash it with distilled water for 3 times, dry it in a 70°C oven, and cut it into pieces to obtain eggshell membrane fragments with a particle size of 80 mesh. Take 1.0 g of the fragmented eggshell membrane and place it in 10 mL Sodium hydroxide solution (0.5 mol / L), transfer the dispersion to a hydrothermal synthesis kettle whose inner wall is made of polytetrafluoroethylene, seal the reaction kettle and place it in an oven at 170°C for 9 hours, and wait for the reaction kettle to cool naturally Centrifuge the reaction solution (10000rpm) for 20min to remove impurities, place the supernatant in a dialysis bag with a molecular weight cut-off of 500Da and dialyze for 12 hours, freeze-dry the product solution and then vacuum-dry to obtain a powdered carbon quant...

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Abstract

The invention discloses a preparation method of water-soluble fluorescent carbon quantum dots based on eggshell membranes and application of the carbon quantum dots in preparation of a nanogold and carbon quantum dot composite nanomaterial. The method particularly comprises the following steps that the eggshell membranes are stripped, cleaned and dried; a certain quantity of the eggshell membranes are dispersed in an alkaline solution, the dispersed solution is transferred into a hydrothermal synthesis kettle, and reacting is conducted under the condition of 150 DEG C to 210 DEG C for 6 h to 18 h; centrifugal dialysis treatment is conducted, a carbon quantum dot solution is obtained, the carbon quantum dot solution is mixed with a chloroauric acid solution, temperature-controlled reacting is conducted for a period of time, and the nanogold and carbon quantum dot composite nanomaterial with good dispersity is obtained. According to the preparation method and application of the water-soluble carbon quantum dots based on the eggshell membranes, the raw materials for synthesizing the carbon quantum dots are low in price and easy to obtain, the method is simple, the product is good in water solubility and can be used as a reducing agent of gold nanoparticles, and usage of an external toxic reducing agent is avoided. The prepared carbon quantum dots and nanogold and carbon quantum dot composite nanomaterial can be applied in the fields of sensing detection, bioimaging and catalytic conversion.

Description

technical field [0001] The present invention relates to a preparation method of fluorescent carbon quantum dots and its application field, in particular to a method for preparing water-soluble fluorescent carbon dots based on eggshell membrane hydrothermal synthesis and carbon quantum dots in the preparation of gold nano / carbon quantum dot composite nanomaterials Applications. Background technique [0002] Fluorescent nanomaterials have a wide range of potential applications in medical imaging, sensing and detection, energy catalysis and other fields due to their excellent photoelectric properties. Traditional semiconductor fluorescent nanomaterials such as CdTe, CdSe, PbS, etc. contain heavy metal elements, which have great toxic and side effects on organisms and the environment, which limits the application range of such quantum dot materials to a certain extent. Carbon quantum dots are a new type of fluorescent carbon nanoparticles with an average particle size of less t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C09K11/65B22F9/24B82Y30/00B82Y20/00
CPCB22F9/24B82Y20/00B82Y30/00C01P2002/82C01P2002/84C01P2004/04C01P2004/64C09K11/65
Inventor 梁淼张果张峻松侯佩李萌王建民
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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