N-CQDs lithium-ion imprinting sensor and preparation method and application thereof

An ion imprinting and sensor technology, applied in the direction of instruments, scientific instruments, analytical materials, etc., can solve problems such as complexity and environmental pollution of finished products, and achieve the effects of high conversion rate, simple and feasible operation, and excellent selectivity

Inactive Publication Date: 2019-04-26
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation of carbon quantum dots is mainly divided into two categories, one is the top-down method, and the other is the bottom-up method, which mainly includes chemical oxidation method, ultrasonic method, solvothermal method, microwave radiation method and laser burning method. However, most of these methods are relatively complicated, and the finished products will also cause a certain degree of pollution to the environment.

Method used

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  • N-CQDs lithium-ion imprinting sensor and preparation method and application thereof
  • N-CQDs lithium-ion imprinting sensor and preparation method and application thereof
  • N-CQDs lithium-ion imprinting sensor and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Weigh 0.525g of CA, dissolve it in 10ml of deionized aqueous solution with pH=13, and stir until completely dissolved. Then, 235 μl of EDA was added dropwise to the solution, sealed, and stirred for 5 minutes. Then pour the above solution into a 30ml polytetrafluoroethylene reactor, set the hydrothermal temperature to 200°C and the time to 8h, and then put it into an oven for reaction. After the reaction was completed, the sample was cooled to room temperature with the furnace, and the sample was dialyzed with a 0.22 μm dialysis membrane for 48 hours. Finally, dry in a vacuum oven at 60°C.

[0026] (2) 0.2mmol B15C5 and 0.2mmol LiNO 3 Added to 15ml of acetonitrile solution, stirring at room temperature for 30min. Then, 1.2mmol methacrylic acid (MAA) was added dropwise to the solution, and stirred at room temperature for 30min to complete MAA and B15C5:Li +self-assembly. Add 45 mg of dry N-CQDs to the above solution and sonicate for 15 min. Subsequently, 4.0 mm...

Embodiment 2

[0028] (1) Weigh 0.525 g of CA, dissolve it in 10 ml of deionized aqueous solution with pH=10, and stir until completely dissolved. Then, 335 μl of EDA was added dropwise to the solution, sealed and stirred for 5 minutes. Then pour the above solution into a 30ml polytetrafluoroethylene reactor, set the hydrothermal temperature to 180°C and the time to 7h, and then put it into an oven for reaction. After the reaction was completed, the sample was cooled to room temperature with the furnace, and the sample was dialyzed with a 0.22 μm dialysis membrane for 48 hours. Finally, dry in a vacuum oven at 60°C.

[0029] (2) 0.2mmol B15C5 and 0.2mmol LiNO 3 Added to 20ml of acetonitrile solution, stirring at room temperature for 30min. Then, 1.2mmol methacrylic acid (MAA) was added dropwise to the solution, and stirred at room temperature for 30min to complete MAA and B15C5:Li + self-assembly. Add 50 mg of dry N-CQDs to the above solution and sonicate for 20 min. Subsequently, 4.5 ...

Embodiment 3

[0031] (1) Weigh 0.525 g of CA, dissolve it in 10 ml of deionized aqueous solution with pH=7, and stir until completely dissolved. Then, 435 μl of EDA was added dropwise to the solution, sealed, and stirred for 5 minutes. Then pour the above solution into a 30ml polytetrafluoroethylene reactor, set the hydrothermal temperature to 150°C and the time to 5h, and then put it into an oven for reaction. After the reaction was completed, the sample was cooled to room temperature with the furnace, and the sample was dialyzed with a 0.22 μm dialysis membrane for 48 hours. Finally, dry in a vacuum oven at 60°C.

[0032] (2) 0.2mmol B15C5 and 0.2mmol LiNO 3 Added to 25ml of acetonitrile solution, stirring at room temperature for 30min. Then, 1.2 mmol methacrylic acid (MAA) was added dropwise to the solution, and stirred at room temperature for 30 min to complete the self-assembly of MAA and B15C5: Li+. Add 55 mg of dry N-CQDs to the above solution and sonicate for 25 min. Subsequent...

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Abstract

The invention relates to an ion imprinting sensor, in particular to an N-CQDs lithium-ion imprinting sensor and a preparation method and application thereof, and belongs to the technical field of environmental material preparation. The preparation method includes the steps that cheap green citric acid (CA) is first taken as a carbon source, and ethylenediamine (EDA) is used for nitrogen doping toobtain nitrogen doped carbon quantum dots (N-CQDs) with good fluorescence performance; and then the N-CQDs are used for being combined with an ion imprinting technology (IIT), organic complexes of benzo 15 crown 5 (B15C5) and Li<+> are used as template ions, methanearsonic acid (MAA) is used as a functional monomer, EGDMA is used as a crosslinking agent, azobisisobutylntrile (ABIN) is used as an initiator, and a precipitation polymerization method is used, and the N-CQDs lithium-ion imprinting sensor (N-CQDs / IIP) is prepared and used for detection. The prepared N-CQDs lithium-ion imprinting sensor has good stability and optical performance, and has the ability to selectively identify lithium ions.

Description

technical field [0001] The invention relates to an ion imprinting sensor, in particular to an N-CQDs lithium ion imprinting sensor, a preparation method and an application, and belongs to the technical field of environmental material preparation. Background technique [0002] Lithium is a trace element that is beneficial to the human body, but excessive lithium causes serious harm to human health. Excessive intake of lithium will cause certain harm to the local and systemic health of the human body. The local effect is mainly manifested as strong stimulation and damage to the skin and mucous membranes, while the systemic effect may affect various systems of the body. In terms of the central nervous system, lithium poisoning often manifests in neuromuscular aspects, ranging from laziness, sluggish thinking, inability to concentrate, mental retardation, muscle tremors, to further causing convulsions, loss of consciousness, and even coma and death. May cause muscle weakness, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F222/14C08J9/26G01N21/64
CPCC08F220/06C08J9/26C08J2333/02G01N21/643G01N2021/6432C08F222/102
Inventor 张鸿翔严必胜吴春霞
Owner JIANGSU UNIV
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