Carbon quantum dot fluorescent double-network hydrogel and preparation method and application thereof

A carbon quantum dot and double network technology, applied in the field of carbon quantum dot fluorescent double network hydrogel and its preparation, can solve the problems of poor mechanical strength, limited application of fluorescent single network hydrogel, etc., and achieves good processing performance, optical Stable and efficient properties and uniform particle size

Active Publication Date: 2020-05-29
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there are few related studies on hydrogels and carbon quantum dots, and most of them are researches on the combination of single network hydrogels and carbon q

Method used

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  • Carbon quantum dot fluorescent double-network hydrogel and preparation method and application thereof
  • Carbon quantum dot fluorescent double-network hydrogel and preparation method and application thereof
  • Carbon quantum dot fluorescent double-network hydrogel and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing a carbon quantum dot fluorescent double network hydrogel is as follows:

[0042](1) Preparation of nitrogen-doped carbon quantum dots: use citric acid monohydrate as the carbon source, urea as the nitrogen source, and the mass ratio of urea to citric acid monohydrate is 2:1. After one-step hydrothermal method, the reaction temperature is 120°C , the holding time is 6 hours, first filtered through a 0.22 μm filter membrane, then repeatedly dialyzed with deionized water, and freeze-dried to obtain particles with a particle size distribution of 1-10nm and a high quantum yield, that is, the quantum yield is greater than 17%. Nitrogen-doped carbon quantum dots (N-CDs).

[0043] (2) Preparation of agar / polyacrylamide / nitrogen-doped carbon quantum dots (Agar / PAAM / N-CDs) fluorescent double network hydrogel: (a) prepare acrylamide solution with a monomer concentration of 4mol / L respectively and the agar mixture with a monomer concentration of 20mg / mL, the...

Embodiment 2

[0049] A method for preparing a carbon quantum dot fluorescent double network hydrogel is as follows:

[0050] (1) Preparation of nitrogen-doped carbon quantum dots: use citric acid monohydrate as the carbon source, urea as the nitrogen source, and the mass ratio of urea to citric acid monohydrate is 2:1. After one-step hydrothermal method, the reaction temperature is 120°C , the holding time is 6 hours, first filtered through a 0.22 μm filter membrane, then repeatedly dialyzed with deionized water, and freeze-dried to obtain particles with a particle size distribution of 1-10nm and a high quantum yield, that is, the quantum yield is greater than 17%. Nitrogen-doped carbon quantum dots (N-CDs).

[0051] (2) Preparation of agar / polyacrylamide / nitrogen-doped carbon quantum dots (Agar / PAAM / N-CDs) fluorescent double network hydrogel: (a) prepare acrylamide solution with a monomer concentration of 4mol / L respectively and the agar mixture with a monomer concentration of 20mg / mL, th...

Embodiment 3

[0055] A method for preparing a carbon quantum dot fluorescent double network hydrogel is as follows:

[0056] (1) Preparation of nitrogen-doped carbon quantum dots: use citric acid monohydrate as the carbon source, urea as the nitrogen source, and the mass ratio of urea to citric acid monohydrate is 2:1. After one-step hydrothermal method, the reaction temperature is 120°C , the holding time is 6 hours, first filtered through a 0.22 μm filter membrane, then repeatedly dialyzed with deionized water, and freeze-dried to obtain particles with a particle size distribution of 1-10nm and a high quantum yield, that is, the quantum yield is greater than 17%. Nitrogen-doped carbon quantum dots (N-CDs).

[0057] (2) Preparation of agar / polyacrylamide / nitrogen-doped carbon quantum dots (Agar / PAAM / N-CDs) fluorescent double network hydrogel: (a) prepare acrylamide solution with a monomer concentration of 4mol / L respectively and the agar mixture with a monomer concentration of 20mg / mL, th...

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Abstract

The invention belongs to the technical field of preparation and application of functional materials, and particularly relates to carbon quantum dot fluorescent double-network hydrogel and a preparation method and application thereof. The hydrogel disclosed by the invention takes agar/polyacrylamide dual-network hydrogel as a matrix, and carbon quantum dots are bonded to the agar/polyacrylamide dual-network hydrogel. The agar/polyacrylamide double-network hydrogel is prepared by adopting an efficient one-pot method and is soaked in a nitrogen-doped carbon quantum dot solution, and the preparedhydrogel has excellent mechanical strength and fluorescence property. The fluorescent hydrogel has a quenching phenomenon on metal ions in water, particularly has the most obvious fluorescence quenching effect on ferric ions and the strongest specific recognition effect, has the lowest detection limit of about 3.64 mu mol/L ([mu]M), and has a linear relationship within 80-160 mu M. The fluorescenthydrogel disclosed by the invention is simple in preparation method and convenient to carry, and the application range of the hydrogel in the fields of environmental monitoring and detection and biomedicine is widened.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of functional materials, and in particular relates to a carbon quantum dot fluorescence double network hydrogel, a preparation method thereof and an application in detection of metal ions in water. Background technique [0002] While the rapid development of industry has brought huge economic benefits, it has also caused great damage and pollution to the environment and water bodies. With the increase of industrial activities such as mining, industrial electroplating, and smelting, a large amount of industrial iron-containing wastewater has also been brought. Although compared with mercury, lead, arsenic, and cadmium, iron ions will not cause significant damage to humans and animals. However, the hazards of iron ions are cumulative, non-degradable, and corrosive, and their long-term and large accumulation in water will also cause serious harm to water bodies. Therefore, the det...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L5/12C08L33/26C08F220/56C08F222/38C08F2/48C08K3/04G01N21/64
CPCC08J3/075C08F220/56C08F2/48C08K3/04G01N21/643G01N2021/6432C08J2305/12C08J2433/26C08K2201/005C08F222/385
Inventor 王沛黄江波顾雪娇
Owner DALIAN MARITIME UNIVERSITY
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