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Preparation method of graphene quantum dot sensitized europium-terbium co-doped layered hydroxide and product prepared by the same

A technology of layered hydroxides and graphene quantum dots, applied in the preparation/processing of lanthanide oxides/hydroxides, rare earth metal oxides/hydroxides, rare earth metal compounds, etc., can solve difficult and precise problems Control product structure, disorder of GQD multilayer structure, etc.

Active Publication Date: 2021-05-18
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the sensitization effect of GQD on rare earth elements is only found in aqueous solution system, but due to the randomness of the reaction in aqueous solution system, it is difficult to precisely control the structure of the product, and the product will inevitably agglomerate, resulting in the obtained GQD having a multilayer structure or greater disorder

Method used

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  • Preparation method of graphene quantum dot sensitized europium-terbium co-doped layered hydroxide and product prepared by the same
  • Preparation method of graphene quantum dot sensitized europium-terbium co-doped layered hydroxide and product prepared by the same
  • Preparation method of graphene quantum dot sensitized europium-terbium co-doped layered hydroxide and product prepared by the same

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Take 0.99mmol of Tb (NO 3 ) 3 ·6H 2 O, 0.01mmol of Eu(NO 3 ) 3 ·6H 2 O, 10mmol of NaNO 3 Dissolve 0.5mmol of HMT in 80mL of degassed water, stir evenly, transfer to a 100mL reactor, react at 80°C for 15h, cool to room temperature, wash the precipitate after centrifugation, and dry to obtain NO 3 -LEu 0.01 Tb 0.99 H.

[0036] Take 0.3mmol of NO 3 -LEu 0.01 Tb 0.99 H and 3 mmol Na 3 C 6 h 5 o 7 2H 2 O was dissolved in 80mL of degassed water, stirred evenly, transferred to a 100mL reactor, reacted at 95°C for 20h, cooled to room temperature, washed and dried after centrifugation to obtain CA-LEu 0.01 Tb 0.99 H.

[0037] Weigh 0.1g of CA-LEu 0.01 Tb 0.99 H was dispersed in 80mL exhausted water, 4g of ammonia water was added, stirred evenly, transferred to a 100mL reactor, reacted at 150°C for 10h, cooled to room temperature, centrifuged, washed and dried to obtain GQD-LEu 0.01 Tb 0.99 H.

Embodiment 2

[0039] Take 0.91mmol of Tb(NO 3 ) 3 ·6H 2 O, 0.09mmol of Eu(NO 3 ) 3 ·6H 2 O, 14mmol of NaNO 3 Dissolve 1mmol of HMT in 80mL of degassed water, stir evenly, transfer to a 100mL reactor, react at 90°C for 12h, cool to room temperature, wash the precipitate after centrifugation, and dry to obtain NO 3 -LEu 0.09 Tb 0.91 H.

[0040] Take 0.3mmol of NO 3 -LEu 0.09 Tb 0.91 H and 4.5 mmol Na 3 C 6 h 5 o 7 2H 2 O was dissolved in 80mL of degassed water, stirred evenly, transferred to a 100mL reactor, reacted at 90°C for 24h, cooled to room temperature, washed and dried after centrifugation to obtain CA-LEu 0.09 Tb 0.91 H.

[0041] Weigh 0.1g of CA-LEu 0.09 Tb 0.91 H was dispersed in 80mL of exhausted water, 5g of ammonia water was added, stirred evenly, transferred to a 100mL reactor, reacted at 180°C for 8h, cooled to room temperature, centrifuged, washed and dried to obtain GQD-LEu 0.09 Tb 0.91 H.

Embodiment 3

[0043] Take 0.5mmol of Tb(NO 3 ) 3 ·6H 2 O, 0.5mmol of Eu(NO 3 ) 3 ·6H 2 O, 15mmol of NaNO 3 Dissolve 1.5mmol of HMT in 80mL of degassed water, stir evenly, transfer to a 100mL reactor, react at 80°C for 15h, cool to room temperature, wash the precipitate after centrifugation, and dry to obtain NO 3 -LEu 0.5 Tb 0.5 H.

[0044] Take 0.3mmol of NO 3 -LEu 0.5 Tb 0.5 H and 4 mmol Na 3 C 6 h 5 o 7 2H 2 O was dissolved in 80mL of degassed water, stirred evenly, transferred to a 100mL reactor, reacted at 95°C for 20h, cooled to room temperature, washed and dried after centrifugation to obtain CA-LEu 0.5 Tb 0.5 H.

[0045] Weigh 0.1g of CA-LEu 0.5 Tb 0.5 H was dispersed in 80mL of exhaust water, 4.8g of ammonia water was added, stirred evenly, transferred to a 100mL reactor, reacted at 150°C for 10h, cooled to room temperature, centrifuged, washed and dried to obtain GQD-LEu 0.5 Tb 0.5 H.

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Abstract

The embodiment of the invention provides a preparation method of graphene quantum dot sensitized europium-terbium co-doped layered hydroxide and a product prepared thereby. The method includes: firstly, preparing a europium-terbium co-doped layered hydroxide with nitrate ions as object anions, and utilizing the interlayer confinement space of the europium-terbium co-doped layered hydroxide as a reactor, and introducing graphene quantum dots through the steps of ion exchange, hydrothermal carbonization and the like. The structure of the product is easy to control, actual application requirements are met, and the obtained product is high in luminous efficiency and excellent in performance. The invention provides a new method and a new idea for preparation and large-scale production of the rare earth composite material with excellent optical characteristics.

Description

technical field [0001] The application relates to the technical field of compound synthesis, in particular to a preparation method of graphene quantum dot sensitized europium and terbium co-doped layered hydroxide and products prepared therefrom. Background technique [0002] Layered rare earth hydroxide LRHs, as a two-dimensional inorganic hydroxide material, not only has interlayer ion exchangeability, but also has fluorescence properties. Therefore, it is widely used in high-performance magnetic materials, light-emitting devices, phosphors, catalysts, and sensors. , bioimaging, and drug delivery have important applications. The fluorescence characteristics of LRHs can be modulated by doping different kinds of rare earth elements and changing the doping ratio. However, in the laminate, rare earth ions will coordinate with hydroxyl groups and water molecules, and the vibration of O-H bonds will greatly increase the intensity of rare earth ions. The degree of non-radiative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00C01B32/205C01B32/21C01F17/10C01F17/224
CPCC09K11/7784B82Y20/00B82Y30/00B82Y40/00C01B32/205C01B32/21C01F17/10C01F17/224
Inventor 杨晓晶桑颂冯娉娉
Owner BEIJING NORMAL UNIVERSITY
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