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Carbon quantum dot, carbon quantum dot-titanium dioxide composite material and preparation method thereof

A carbon quantum dot, titanium dioxide technology, applied in the field of photocatalytic materials, can solve problems such as harming the environment, complex purification steps, etc., and achieve the effects of avoiding complex purification steps, good fluorescence stability, and good up-conversion fluorescence properties.

Active Publication Date: 2020-12-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, numerous chemistries for N doping require further passivation or surface modification, which lead to complicated purification steps and harm the environment

Method used

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  • Carbon quantum dot, carbon quantum dot-titanium dioxide composite material and preparation method thereof
  • Carbon quantum dot, carbon quantum dot-titanium dioxide composite material and preparation method thereof
  • Carbon quantum dot, carbon quantum dot-titanium dioxide composite material and preparation method thereof

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preparation example Construction

[0036] An embodiment of the present invention provides a method for preparing carbon quantum dots, which includes: mixing and dissolving a carbon source, phenylenediamine and water, and then performing a hydrothermal reaction. The inventors found that N-doped carbon quantum dots can be prepared by a one-step hydrothermal method using carbon source, phenylenediamine and water as raw materials, and the prepared carbon quantum dots have good fluorescence properties.

[0037] Specifically, the phenylenediamine is at least one selected from o-phenylenediamine, m-phenylenediamine and p-phenylenediamine; m-phenylenediamine is preferred. When m-phenylenediamine is used to control the surface groups of fluorescent carbon dots, the fluorescence performance of quantum dots is the best, which may be due to the fact that the two amino groups on m-phenylenediamine are more likely to combine with L-glutamic acid during the hydrothermal process. The two carboxyl groups undergo acylation react...

Embodiment 1

[0051] This embodiment provides a method for preparing carbon quantum dots, including:

[0052] Weigh 0.74g (0.005mol) of L-glutamic acid and 0.054g (0.0005mol) of o-phenylenediamine in a 50mL polytetrafluoroethylene reactor, add 20mL of deionized water to dissolve. After magnetic stirring for 30 min, the stirring bar was taken out and reacted in an oven at 200° C. for 6 h. After the reaction is completed, cool down to room temperature with the oven, and take out the stock solution of carbon quantum dots.

Embodiment 2

[0054] This embodiment provides a method for preparing carbon quantum dots, which differs from Embodiment 1 only in that o-phenylenediamine is replaced by m-phenylenediamine in equimolar amounts.

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Abstract

The invention discloses a carbon quantum dot, a carbon quantum dot-titanium dioxide composite material and a preparation method thereof, and relates to the technical field of photocatalytic materials.The preparation method of the carbon quantum dot comprises the following steps: mixing and dissolving a carbon source, phenylenediamine and water, and carrying out hydrothermal reaction. Complex purification steps caused by passivation or surface modification are avoided, the method is a simple and convenient one-pot method for preparing the N-CQDs, and the prepared N-doped carbon quantum dots have good up-conversion fluorescence properties and fluorescence stability. According to the preparation method of the carbon quantum dot-titanium dioxide composite material, the carbon quantum dot-titanium dioxide composite material is prepared in an in-situ compounding or later compounding mode, the photocatalytic capacity of titanium dioxide can be remarkably improved, and the carbon quantum dot-titanium dioxide composite material has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, and in particular to carbon quantum dots, carbon quantum dot-titanium dioxide composite materials and preparation methods thereof. Background technique [0002] Semiconductor quantum dots (QDs) possess unique size-dependent optoelectronic properties, which have attracted extensive research on their applications. For example, CdSe quantum dots have been applied in sensing, imaging, environmental monitoring, solar cells, etc. Carbon quantum dots (CQDs), as an emerging material, have been used in various applications, such as analytical detection, photocatalysis, etc., due to their excellent biocompatibility, resistance to photodegradation, and low toxicity. [0003] Many preparation methods of carbon quantum dots (CQDs) have been reported, such as laser ablation, electrochemical, chemical oxidation, etc., some of which require strict reaction conditions and time-consuming purifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B01J21/06B01J27/24B01J37/10B82Y20/00B82Y30/00B82Y40/00C02F1/30C02F1/32C01B32/15C02F101/34C02F101/38C02F101/30
CPCC09K11/65C09K11/0883B01J21/063B01J27/24B01J37/10B82Y20/00B82Y30/00B82Y40/00C02F1/30C02F1/32C01B32/15C02F2101/34C02F2101/38C02F2101/308C02F2305/10C02F2101/40B01J35/39
Inventor 赵强邓益清邹旺材赵艳青张欢
Owner SICHUAN UNIV
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