Copper ferrite/graphene quantum dot composite material, and preparation method and application thereof

A technology of graphene quantum dots and composite materials, which is applied in the field of copper ferrite/graphene quantum dot composite materials and its preparation and application, and can solve the problems of affecting the sensitivity and precision of pesticide detection, the absorbance value is not high enough, and the color reaction speed is slow and other problems, to achieve good electron transport performance, enhanced catalytic effect, and fast color development.

Inactive Publication Date: 2015-12-16
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned nanomaterials (peroxidase-like materials) have similar catalytic properties to peroxidase, their catalytic ability is relatively weak, the color reaction speed is slow, the color development is not obvious, and the absorbance value is not high enough, which will affect the detection of pesticides. Sensitivity and Accuracy

Method used

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  • Copper ferrite/graphene quantum dot composite material, and preparation method and application thereof
  • Copper ferrite/graphene quantum dot composite material, and preparation method and application thereof
  • Copper ferrite/graphene quantum dot composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Material preparation

[0037] (1) Preparation of GQDs: Add 2 g of solid citric acid (CA) into a 5 mL beaker, heat to 200 ° C, the citric acid (CA) melts into a liquid, and then the citric acid (CA) liquid changes from colorless to light Yellow, and finally orange liquid. Finally, under vigorous stirring, the 1M NaOH solution was dropped dropwise into the orange liquid until the pH reached 7, and the heating was continued, and finally a GQDs solution was prepared, and the mass of the obtained GQDs solution was m.

[0038] (2)CuFe 2 o 4 Preparation: First, 0.2025gCuCl 2 ·2H 2 O and 0.4875g FeCl 3 ·6H 2 O was added to 20mL of ethylene glycol (EG), stirred to a transparent solution, then 1.8g of sodium acetate (NaAc) and 0.5g of polyethylene glycol (PEG) were added and stirred for 30min, and loaded into a PTFE reactor with a capacity of 25mL. Heated to 200°C for 8h, cooled to room temperature after reaction to obtain a black product, centrifuged and washed with et...

Embodiment 2

[0046] 1. Material preparation

[0047] (1) Preparation of GQDs: Take 1 g of solid citric acid (CA) into a 5 mL beaker, heat to 150 ° C, the citric acid (CA) melts into a liquid, and then the citric acid (CA) liquid changes from colorless to light Yellow, and finally orange liquid. Finally, under vigorous stirring, the KOH solution with a concentration of 1M was dropped into the orange liquid drop by drop until the pH reached 6, and the heating was continued, and finally a GQDs solution was prepared, and the mass of the obtained GQDs solution was m.

[0048] (2)CuFe 2 o 4 Preparation: First, 0.135gCuCl 2 ·2H 2 O and 0.325 g FeCl 3 ·6H 2O was added to 20mL of ethylene glycol (EG), stirred to a transparent solution, then 1.4g of sodium acetate (NaAc) and 0.3g of polyethylene glycol (PEG) were added and stirred for 30min, and loaded into a PTFE reactor with a capacity of 25mL. Heated to 150°C for 6h, cooled to room temperature after reaction to obtain a black product, cent...

Embodiment 3

[0056] 1. Material preparation

[0057] (1) Preparation of GQDs: Add 4 g of solid citric acid (CA) into a beaker with a volume of 5 mL, heat to 250 ° C, the citric acid (CA) melts into a liquid, and then the citric acid (CA) liquid changes from colorless to light Yellow, and finally orange liquid. Finally, under vigorous stirring, the 1M NaOH solution was dropped dropwise into the orange liquid until the pH reached 8, and the heating was continued, and finally a GQDs solution was prepared, and the mass of the obtained GQDs solution was m.

[0058] (2)CuFe 2 o 4 Preparation: First, 0.27gCuCl 2 ·2H 2 O and 0.65gFeCl 3 ·6H 2 O was added to 20mL of ethylene glycol (EG), stirred to a transparent solution, then 2.2g of sodium acetate (NaAc) and 0.7g of polyethylene glycol (PEG) were added and stirred for 30min, and loaded into a PTFE reactor with a capacity of 25mL. Heated to 250°C for 10h, cooled to room temperature after reaction to obtain a black product, centrifuged and w...

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Abstract

The invention provides a copper ferrite / graphene quantum dot composite material, and a preparation method and application thereof. The material is well applicable to colourimetry detection field, and is especially applicable to colourimetry detection on organic phosphorus pesticides. Graphene quantum dot and copper ferrite are firstly respectively prepared and then mixed, so that a CuFe2O4 / GQDs composite material is prepared by utilizing electrostatic incorporation effect. Additionally, the composite material possesses excellent electrical conductivity, good electron transmission performance, substantially-enhanced catalytic effect, and further enhanced detection sensitivity. Also, because the GQDs surface carries a certain amount of hydrophilic groups, combination of GQDs is relatively beneficial for dispersing of CuFe2O4 / GQDs in water. The method detecting organic phosphorus pesticides employs a chromogenic substrate TMB which is relatively sensitive in color development and free of carcinogenicity, the employed CuFe2O4 / GQDs nanometer composite material possesses magnetism, and is extremely easily separated, recovered and utilized through a physical process, and the green chemistry idea is satisfied.

Description

technical field [0001] The invention relates to synthesizing a copper ferrite / graphene quantum dot (CuFe 2 O 4 / GQDs) carbon-based nanocomposite material with magnetic similar peroxidase activity and preparation method and use thereof, the material has good application in the field of colorimetric detection, and is especially suitable for colorimetric detection of organophosphorus pesticides. Background technique [0002] In recent years, due to the large and extensive use of pesticides, a large number of pesticide residues in agricultural products are not easily decomposed, and eventually enter the human body through diet. The problem of pesticide residues has brought huge harm to human production and life, seriously affecting the The physical and mental health of consumers. Therefore, the detection of organophosphorus pesticide residues is of great significance, and it is urgent to develop an efficient, simple, accurate, sensitive and low-cost pesticide biosensor. [00...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 毛罕平左志强严玉婷杨宁施杰
Owner JIANGSU UNIV
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