Preparation method of graphene-rare earth up-conversion composite material and application thereof in joint toxicity evaluation of pesticides

A rare earth upconversion and composite material technology, applied in the application of pesticide combined toxicity evaluation, in the field of preparation of graphene-rare earth upconversion composite material, which can solve the problem of low upconversion luminous efficiency, poor water solubility, few functional groups, etc. problem, to achieve the effect of stable photochemical properties, low toxicity and simple process

Active Publication Date: 2019-11-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rare earth up-conversion luminescent materials have certain limitations, such as low up-conversion luminescence efficiency, poor water solubility, and few functional groups.

Method used

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  • Preparation method of graphene-rare earth up-conversion composite material and application thereof in joint toxicity evaluation of pesticides
  • Preparation method of graphene-rare earth up-conversion composite material and application thereof in joint toxicity evaluation of pesticides
  • Preparation method of graphene-rare earth up-conversion composite material and application thereof in joint toxicity evaluation of pesticides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Take citric acid monohydrate, histidine and M in a beaker, wherein the mol ratio of citric acid monohydrate and histidine is 1:0.1, and the mass ratio of citric acid monohydrate and M is 1:0.05, Add 5ml of water and put it in a constant temperature blast drying oven at 150°C for 6h to prepare His-M-GQD;

[0040] Weigh citric acid monohydrate and histidine at a molar ratio of 1:0.1, add 5ml of water, and place in a constant temperature blast drying oven at 150°C for 6 hours to prepare His-GQD;

[0041] Weigh 0.1g of citric acid monohydrate and add it to 5ml of water, put it into a constant temperature blast drying oven at 150°C for 5h to prepare graphene quantum dots GQD;

[0042] Prepare His-M-GQD, His-GQD and GQD respectively into 25 mg / ml aqueous solution, and adjust the pH to neutral; since dimethyl biguanide hydrochloride is unstable in the presence of strong alkali, use PBS buffer solution to adjust pH of the His-M-GQD solution;

[0043] (2) UCNP coated with ...

Embodiment 2

[0050] (1) Take citric acid monohydrate, histidine and M in a beaker, wherein the mol ratio of citric acid monohydrate and histidine is 1:1, and the mass ratio of citric acid monohydrate and M is 1:0.3, Add 25ml of water and put it into a 2000°C constant temperature blast drying oven for 10h to prepare His-M-GQD;

[0051] Weigh citric acid monohydrate and histidine at a molar ratio of 1:1, add 25ml of water, and place in a constant temperature blast drying oven at 180°C for 10 hours to prepare His-GQD;

[0052] Weigh 10g of citric acid monohydrate and add it to 30ml of water, put it into a 2100°C constant temperature blast drying oven for 10h to prepare graphene quantum dots GQD;

[0053] Prepare His-M-GQD, His-GQD and GQD respectively into 60mg / ml aqueous solution, and adjust the pH to neutral; since dimethyl biguanide hydrochloride is unstable in the presence of strong alkali, use PBS buffer solution to adjust pH of the His-M-GQD solution;

[0054] (2) UCNP coated with ole...

Embodiment 3

[0061] (1) Take citric acid monohydrate, histidine and M in a beaker, wherein the mol ratio of citric acid monohydrate and histidine is 1:10, and the mass ratio of citric acid monohydrate and M is 1:0.5, Add 50ml of water and put it into a 250°C constant temperature blast drying oven for 0.5h to prepare His-M-GQD;

[0062] Weigh citric acid monohydrate and histidine at a molar ratio of 1:10, add 50ml of water, and place in a constant temperature blast drying oven at 250°C for 0.5h to prepare His-GQD;

[0063] Weigh 100g of citric acid monohydrate and add it to 5ml of water, and put it into a 250°C constant temperature blast drying oven for 0.5h to prepare graphene quantum dots GQD;

[0064] Make His-M-GQD, His-GQD and GQD into 100mg / ml aqueous solution, adjust the pH to neutral; since dimethyl biguanide hydrochloride is unstable in the presence of strong alkali, use PBS buffer solution to adjust pH of the His-M-GQD solution;

[0065] (2) UCNP coated with oleic acid was prepa...

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PUM

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Abstract

The invention belongs to the technical field of chemical engineering, and particularly relates to a preparation method of a graphene-rare earth up-conversion composite material and an application thereof in pesticide joint toxicity evaluation, and the preparation method comprises the following steps: preparation of graphene quantum dots, preparation of up-conversion nano material dispersion liquidand preparation of the graphene-rare earth up-conversion composite material. By introducing the functionalized graphene quantum dots, the upconversion material is endowed with more functional groups;the modified up-conversion material has good hydrophilicity; the rare earth doped up-conversion nanoparticles are low in toxicity and not prone to photodegradation, the inorganic matrix material is of a rigid structure, the photobleaching effect cannot be emitted, light emitting is very stable, and the rare earth doped up-conversion nanoparticles are very suitable for in-vitro or in-vivo imaginganalysis.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of a graphene-rare earth up-conversion composite material and its application in the combined toxicity evaluation of pesticides. Background technique [0002] The current environmental quality standard formulation or ecological risk assessment is mostly based on the toxic effect of a single compound, but in the actual environment, compounds often exist in the form of a mixture, which may produce various joint toxic effects, such as synergistic effects, antagonistic effects, etc. The uncertainty of this joint toxic effect poses a potential threat to ecological security and environmental quality assessment. Their combined risks to human health are yet to be assessed. For example, in 1996, the U.S. Congress passed the "Food Quality Protection Regulations", requiring the U.S. Environmental Protection Agency (EPA) to conduct cumulative risk ...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/77G01N21/64G01N33/50
CPCC09K11/02C09K11/025C09K11/7766G01N21/6428G01N33/5014G01N2021/6417G01N2021/6432
Inventor 李在均李娜娜李瑞怡孙秀兰
Owner JIANGNAN UNIV
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