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Preparation method and application of GQDs (graphene quantum dots)

A technology of graphene quantum dots and uses, applied in the directions of graphene, separation methods, chemical instruments and methods, etc., can solve the problems of low target recognition response, cumbersome sample pretreatment, large size differences, etc., to improve the recognition ability, Uniform size and high quantum yield

Active Publication Date: 2017-11-07
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art such as low yield and large size difference in the preparation process of graphene quantum dots; in the process of detecting BPA, the sample pretreatment is cumbersome and the response to target recognition is low, and a kind of SBA-15 is provided. Microreactor for the preparation of graphene quantum dots and the application of fluorescent sensors

Method used

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  • Preparation method and application of GQDs (graphene quantum dots)
  • Preparation method and application of GQDs (graphene quantum dots)
  • Preparation method and application of GQDs (graphene quantum dots)

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Preparation of graphene quantum dots (GQDs) based on SBA-15 microreactor

[0030] 1g SBA-15 dispersed to contain 0.5g AlCl 3 In the ethanol solution, stir vigorously for 12h. Then the mixture was put into a rotary evaporator for rotary evaporation, and evaporated to dryness at 50°C. Finally, the solid was transferred to a tube furnace at 550°C for 5 hours in the air to obtain AlSBA-15. Take 1.0g of prepared AlSBA-15, evenly drop 2.5mL FA on its surface for impregnation, and then remove excess FA in an oven at 80°C. Grind the prepared solid (PFA-SBA-15) into powder, transfer to a tube furnace, burn at 150°C for 1 hour, then raise the temperature to 300°C at 10°C / min, then raise the temperature to 850°C at 5°C / min and keep for 4 hours. 10mL / min N 2 Polycondensation is carried out in the gas flow, and a thin carbon layer is formed on the inner wall of AlSBA-15 channel to obtain C / SBA-15. Weigh 1g of C / SBA-15 into a polytetrafluoroethylene reactor, add 6mL of conce...

Embodiment 2

[0034] (1) Preparation of graphene quantum dots (GQDs) based on SBA-15 microreactor

[0035] 1g SBA-15 dispersed to contain 1g AlCl 3 In the ethanol solution, stir vigorously for 12h. Then the mixture was put into a rotary evaporator for rotary evaporation, and evaporated to dryness at 50°C. Finally, the solid was transferred to a tube furnace at 550°C for 5 hours in the air to obtain AlSBA-15. Take 1.0g of prepared AlSBA-15, evenly drop 3.0mL FA on its surface for impregnation, and then remove excess FA in an oven at 80°C. Grind the prepared solid (PFA-SBA-15) into powder, transfer to a tube furnace, burn at 150°C for 2h, then raise the temperature to 300°C at 10°C / min, then raise the temperature to 850°C at 5°C / min and keep for 4.5h , 10mL / min N 2 Polycondensation is carried out in the gas flow, and a thin carbon layer is formed on the inner wall of AlSBA-15 channel to obtain C / SBA-15. Weigh 1g of C / SBA-15 into a polytetrafluoroethylene reactor, add 8mL of concentrated ...

Embodiment 3

[0039] (1) Preparation of graphene quantum dots (GQDs) based on SBA-15 microreactor

[0040] 1g SBA-15 dispersed to contain 1.5g AlCl 3 In the ethanol solution, stir vigorously for 12h. Then the mixture was put into a rotary evaporator for rotary evaporation, and evaporated to dryness at 50°C. Finally, the solid was transferred to a tube furnace at 550°C for 5 hours in the air to obtain AlSBA-15. Take 1.0g of prepared AlSBA-15, evenly drop 4.0mL FA on its surface for impregnation, and then remove excess FA in an oven at 80°C. Grind the prepared solid (PFA-SBA-15) into powder, transfer to a tube furnace, burn at 150°C for 2.5h, then raise the temperature to 300°C at 10°C / min, then raise the temperature to 850°C at 5°C / min and keep for 5h , 10mL / min N 2 Polycondensation is carried out in the gas flow, and a thin carbon layer is formed on the inner wall of AlSBA-15 channel to obtain C / SBA-15. Weigh 1g of C / SBA-15 into a polytetrafluoroethylene reactor, add 10mL of concentrat...

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Abstract

The invention belongs to the technical field of environmental functional material preparation, and relates to a method for preparing GQDs (graphene quantum dots) by a SBA-15 micro-reactor and an application of a fluorescent sensor. With SBA-15 taken as a micro-reactor, the problems of low yield, large size difference and the like in preparation of the GQDs in the prior art are solved, and the GQDs with uniform size and high quantum yield are prepared; the fluorescence sensor (BPA-MIP) capable of specifically recognizing BPA is prepared from MMA (methyl methacrylate) and MAP (methyl 3-phenyl-L-alaninate) as functional monomers and BPA as a template by free radical polymerization. Due to combination with a surface molecular imprinting technology, the recognition capacity of the GQDs for target molecules is improved, the response speed to target objects is increased, and a solid theoretical and practical foundation is laid for rapid and selective detection of trace BPA in beverages.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials, and relates to a preparation method of SBA-15 microreactor for graphene quantum dots and the application of fluorescence sensors, in particular to a fluorescent molecular imprinting polymerization of graphene quantum dots on the surface of graphene oxide The preparation method of the compound and its use in the detection of bisphenol A. Background technique [0002] Bisphenol A (BPA) is an estrogen endocrine disruptor with carcinogenicity and reproductive system toxicity. BPA is widely used in polycarbonate plastic products in the plastics industry, as a monomer in epoxy resin manufacturing, and as an additive in other products (such as flame retardants, plasticizers). Some of these plastics are used in food and beverage packaging containers, where BPA often seeps out when these containers are heated or submerged in water. At present, BPA has been detec...

Claims

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Application Information

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IPC IPC(8): C08F222/14C08F220/14C08F2/44C08J9/26C01B32/19G01N21/64B01J20/26B01J20/30B01D15/38
CPCB01D15/3852B01J20/268C01P2002/72C01P2002/82C08F2/44C08F222/1006C08J9/26C08J2201/0422C08J2335/02C08F222/102G01N21/6402C08F220/14
Inventor 刘燕仇建白露倪良刘占超
Owner JIANGSU UNIV
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