Eutectic solvent, carbon quantum dots, preparation method and application

A technology of deep eutectic solvent and carbon quantum dots, which is applied in the direction of oxidative preparation of carboxylic acids, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of high reaction cost, harsh reaction conditions, poor reaction selectivity, etc., and achieve high Chemical stability, short reaction time, and mild reaction conditions

Active Publication Date: 2020-11-10
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of poor reaction selectivity, harsh reaction conditions and high reaction cost in the method for degrading lignin in the prior art, the present invention provides a deep eutectic solvent carbon quantum dot and its preparation method and application

Method used

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  • Eutectic solvent, carbon quantum dots, preparation method and application
  • Eutectic solvent, carbon quantum dots, preparation method and application
  • Eutectic solvent, carbon quantum dots, preparation method and application

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Embodiment 1

[0034] An embodiment of the present invention provides a deep eutectic solvent and carbon quantum dots,

[0035] The deep eutectic solvent is prepared from phenol and isoleucine with a molar ratio of 3:2, specifically comprising the following steps:

[0036] Mix 0.3mol (28.233g) of phenol and 0.2mol (26.234g) of isoleucine into a 100mL flask, raise the temperature to 95°C, and stir at a constant temperature of 25 rpm for 6 hours to make the system uniform and transparent, and obtain iso Leucine / phenol deep eutectic solvent A.

[0037] The method for preparing carbon quantum dots by using the above-mentioned isoleucine / phenol deep eutectic solvent A specifically includes the following steps:

[0038] Add the isoleucine / phenol deep eutectic solvent A into the crucible, heat to 450°C and roast it into a solid, grind it into powder, place it in a muffle furnace, and dry it at a constant temperature of 300°C for 4 hours to obtain carbon quantum dots A16.5g.

[0039] figure 1 Th...

Embodiment 2

[0043] An embodiment of the present invention provides a deep eutectic solvent and carbon quantum dots,

[0044] The deep eutectic solvent is prepared from cresol and glycine with a molar ratio of 1:2.5, specifically comprising the steps of:

[0045] Mix 0.2 mol (21.62 g) of cresol and 0.5 mol (37.535 g) of glycine into a 100 mL flask, raise the temperature to 110 ° C, and stir at a constant temperature of 25 rpm for 4 hours to make the system uniform and transparent to obtain glycine / formazine Phenolic eutectic solvent B.

[0046] The method for preparing carbon quantum dots by utilizing the above-mentioned glycine / cresol deep eutectic solvent B specifically includes the following steps:

[0047] Add the glycine / cresol deep eutectic solvent B into a crucible, heat it to 250°C and roast it into a solid, grind it into powder, place it in a muffle furnace, and dry it at a constant temperature of 180°C for 5 hours to obtain carbon quantum dots B19. 2g.

Embodiment 3

[0049]An embodiment of the present invention provides a deep eutectic solvent and carbon quantum dots,

[0050] The deep eutectic solvent is prepared from naphthol and glycine with a molar ratio of 1:0.23, specifically comprising the steps of:

[0051] Mix 0.4mol (57.6g) of naphthol and 0.09mol (6.87g) of glycine into a 100mL flask, raise the temperature to 100°C, and stir the reaction at a constant temperature of 25 rpm for 8 hours to make the system uniform and transparent to obtain glycine / naphthalene Phenol deep eutectic solvent C.

[0052] Utilize above-mentioned glycine / naphthol deep eutectic solvent C to prepare the method for carbon quantum dots specifically comprise the steps:

[0053] Add the glycine / naphthol deep eutectic solvent C into a crucible, heat it to 300°C and roast it into a solid, grind it into powder, place it in a muffle furnace, and dry it at a constant temperature of 150°C for 6 hours to obtain carbon quantum dots C19. 9g.

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Abstract

The invention relates to the technical field of carbon material preparation, and particularly discloses a eutectic solvent, carbon quantum dots, a preparation method and application. The eutectic solvent is prepared from a phenolic compound and hydrophobic amino acid in a molar ratio of 1: 0.2-5. The preparation method of the carbon quantum dots comprises the following steps: roasting the eutecticsolvent at 250-600 DEG C, and drying to obtain the carbon quantum dots. The carbon quantum dots provided by the invention contain a hydrophobic group and have good affinity with a lignin model compound, so that the dispersity of the prepared carbon quantum dots is improved, the sufficient contact between the carbon quantum dots and lignin is promoted, and the conversion rate of the carbon quantumdots and lignin is improved; the carbon quantum dots are also modified with hydroxyl and amino functional groups with stable structures, so that the selectivity of lignin degradation reaction is improved, the yield of a target phenol product is further improved, efficient degradation of lignin can be realized under normal-pressure and low-temperature natural light conditions, and the carbon quantum dots have a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of carbon material preparation, in particular to a deep eutectic solvent, carbon quantum dots, a preparation method and application. Background technique [0002] Lignin is an inexpensive and abundant renewable resource, and it is one of the few non-petroleum resources that can provide renewable aryl compounds. In recent years, with the increasing scarcity of non-renewable resources such as petroleum and coal and the increasing concern of countries on environmental pollution, the conversion and utilization of lignocellulose resources have become an important way to solve energy and environmental problems, and have been received by various countries. highly valued and extensively studied. However, lignin contains a large number of aromatic ring structures and is in an amorphous state. It is chemically stable and difficult to depolymerize, which limits its large-scale chemical industrial application. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/04B01J31/02B01J21/18B01J35/10C01B32/15C09K11/65C07C51/16C07C37/055C07C1/20B82Y40/00B82Y30/00C07C39/04C07C15/46C07C63/06C07B41/02
CPCB01J31/04B01J31/0202B01J35/0006C09K11/65C01B32/15B82Y30/00B82Y40/00B01J35/1004B01J21/18C07C37/055C07C1/20C07C51/16C07B41/02C01P2004/04C07C2531/04C07C2521/18C07C39/04C07C15/46C07C63/06Y02P20/52
Inventor 任红威柴天祥宫睿全赵腾达刘家琦苏昭桂
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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