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Graphene quantum dot functionalized nanogold and preparation method and application thereof

A technology of graphene quantum dots and nano-gold, which is applied in the direction of measuring devices, electrochemical variables of materials, instruments, etc., can solve the problems of slow induction of human beings, poisoning nerves, cell inactivation, etc., and achieves enhanced reducing ability and increased water solubility , good dispersion effect

Inactive Publication Date: 2021-06-04
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Insecticides, as one of the pesticides, are widely used in the control of rice, wheat, corn, soybeans and other crops, but the pesticides left in fruits and vegetables can slowly induce human diseases, such as neurotoxicity, cell inactivation, and carcinogenesis

Method used

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  • Graphene quantum dot functionalized nanogold and preparation method and application thereof
  • Graphene quantum dot functionalized nanogold and preparation method and application thereof

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Embodiment 1

[0037] 1. Preparation of aspartic acid-glycine functionalized graphene quantum dots

[0038] 1) Weigh 2g of citric acid, 0.63g of aspartic acid and 0.71g of glycine respectively, put them into a beaker, add 10mL of water to dissolve and stir evenly, then put them in an oven, and react at 180°C for 180min to obtain aspartic acid - Glycine functionalized graphene quantum dots (CA-ASP-GLY-GQDs).

[0039] 2. Preparation of gold nanoparticles

[0040] Weigh CA-ASP-GLY-GQDs to prepare a 1mg / mL solution. HAuCl 4 (10mmol / L5mL) was heated to 95°C to boil, and then CA-ASP-GLY-GQDs (1mg / mL 50mL) solution was added. After the color of the solution changed from yellow to purple, continue heating for 8 min. After cooling to room temperature, it was centrifuged at 4000 rpm for 10 min, and the precipitate was collected and redispersed in water to obtain graphene quantum dot functionalized gold nanoparticles (Au NPs).

[0041] 3. Construction of electrochemical sensors

[0042] 1) The gl...

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Abstract

The invention discloses graphene quantum dot functionalized nanogold and a preparation method thereof. The preparation method comprises the following steps that 1, citric acid, aspartic acid and glycine are dissolved in water and stirred to be uniform, heating is conducted for 120-200 min at the temperature of 150-180 DEG C, and citric acid-aspartic acid-glycine quantum dots are obtained; and (2) the citric acid-aspartic acid-glycine quantum dots are added into a boiling chloroauric acid aqueous solution, heating is performed for 8 minutes, cooling is performed, a product is collected, and the product is re-dispersed in water to obtain the graphene quantum dot functionalized nanogold solution. The invention also discloses an electrochemical sensor modified by the graphene quantum dot functionalized nanogold and a method for detecting chlorpyrifos by using the electrochemical sensor. The nanogold synthesized by using the graphene quantum dots as a reducing agent has excellent conductivity, and the electrochemical sensor constructed by using the nanogold synthesized by the quantum dots as an electrocatalytic active substance and the aptamer as a recognition molecule can detect the organophosphorus pesticide chlorpyrifos.

Description

technical field [0001] The invention relates to the technical field of analysis and detection of organophosphorus pesticides, in particular to a graphene quantum dot functionalized nano-gold and its preparation method and application. Background technique [0002] Insecticides, as one of the pesticides, are widely used in the control of rice, wheat, corn, soybeans and other crops, but the pesticides left in fruits and vegetables can slowly induce human diseases, such as neurotoxicity, cell inactivation, and carcinogenesis . Organophosphorus pesticides accounted for 38% of pesticides. Chlorpyrifos (O,O-diethyl-O-(3,5,6-trichloro-2-pyridyl)thiophosphoric acid) (Chlorpyrifos, CPS), as a highly effective and broad-spectrum insecticide, is very easy to pollute water bodies , air, and soil, when the human body is exposed to chlorpyrifos for a long time, it can cause changes in human polyamine metabolism, induce oxidative stress, and damage DNA. Among other things, studies have ...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 李在均王金李瑞怡徐鹏武
Owner JIANGNAN UNIV
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