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Sulfonated carbon quantum dots, preparation method thereof and application thereof serving as catalyst in preparing 5-hydroxymethyl furaldehyde

A carbon quantum dot and a technology for quantum dots are applied to sulfonated carbon quantum dots, their preparation and their application as a catalyst in the preparation of 5-hydroxymethylfurfural, which can solve the problem of high temperature and achieve good dispersibility and good contact. , the preparation method is simple and easy to implement

Active Publication Date: 2019-05-14
ZHEJIANG SUGAR ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The literature [Catalysis Today, 2016, 264, 123-130] reported a preparation method of sulfonated carbon microspheres, using the catalyst in a dimethyl sulfoxide solvent at 160 °C, and the 5-hydroxymethylfurfural obtained by dehydration of fructose was harvested The rate is 90%, but the reaction temperature is too high

Method used

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  • Sulfonated carbon quantum dots, preparation method thereof and application thereof serving as catalyst in preparing 5-hydroxymethyl furaldehyde
  • Sulfonated carbon quantum dots, preparation method thereof and application thereof serving as catalyst in preparing 5-hydroxymethyl furaldehyde
  • Sulfonated carbon quantum dots, preparation method thereof and application thereof serving as catalyst in preparing 5-hydroxymethyl furaldehyde

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Embodiment 1

[0034] Immerse 0.4g camphor leaves in a concentration of 1wt% hydrogen peroxide solution, the mass ratio of biomass to hydrogen peroxide is 1:1.2, hydrothermal treatment at a temperature of 140°C for 12h, and synthesize a carbon quantum dot dispersion; The carbon quantum dot dispersion was fully dialyzed, and a solid sample was obtained after freeze-drying.

[0035] The solid sample was dissolved in 98% concentrated sulfuric acid, sulfonated at 100° C. for 2 hours, then fully dialyzed, and sulfonated carbon quantum dots were obtained after freeze-drying.

[0036] The transmission electron micrograph and particle size distribution of the sulfonated carbon quantum dots prepared above are as follows: figure 1 As shown, it is shown that the prepared particle size is 1.5nm-4.5nm. figure 1 The upper right corner is an enlarged view of a sulfonated carbon quantum dot, which shows that the sulfonated carbon quantum dot has obvious lattice fringes, and the interplanar spacing is 0.21n...

Embodiment 2

[0044] Immerse 0.6g camphor leaves in a concentration of 2wt% hydrogen peroxide solution, the mass ratio of biomass to hydrogen peroxide is 1:2, hydrothermal treatment at a temperature of 160°C for 10h, and synthesize a carbon quantum dot dispersion; The carbon quantum dot dispersion was fully dialyzed, and a solid sample was obtained after freeze-drying.

[0045]The solid sample was dissolved in 98% concentrated sulfuric acid, sulfonated at a temperature of 100°C for 6 hours to obtain a sulfonated carbon quantum dot solution, then fully dialyzed, and freeze-dried to obtain the sulfonated carbon quantum dots.

[0046] The transmission electron micrograph and particle size distribution of the above-mentioned sulfonated carbon quantum dots are similar figure 1 As shown, it is shown that the obtained particle size is 2.0nm-3.5nm, and similar to graphene, containing sp 2 and sp 3 carbon.

[0047] The infrared spectrum of the sulfonated carbon quantum dots prepared above is simi...

Embodiment 3

[0050] Immerse 0.8g camphor leaves in a hydrogen peroxide solution with a concentration of 3wt%, the mass ratio of biomass to hydrogen peroxide is 1:3, and hydrothermally treat it at a temperature of 180°C for 12h to synthesize a carbon quantum dot dispersion; The quantum dot dispersion was fully dialyzed and freeze-dried to obtain a solid sample.

[0051] The solid sample was dissolved in 98% concentrated sulfuric acid, and sulfonated at 140°C for 12 hours to obtain a sulfonated carbon quantum dot solution, which was then fully dialyzed and freeze-dried to obtain the sulfonated carbon quantum dots.

[0052] The transmission electron micrograph and particle size distribution of the above-mentioned sulfonated carbon quantum dots are similar figure 1 As shown, it is shown that the obtained particle size is 2.0nm-4.5nm, and is similar to graphene, containing sp 2 and sp 3 carbon.

[0053] The infrared spectrum of the sulfonated carbon quantum dots prepared above is similar to ...

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Abstract

The invention discloses sulfonated carbon quantum dots. Particle size of the sulfonated carbon quantum dots is 1.5-4.5nm, each sulfonated carbon quantum dot is of a graphene-like structure, and the surface of each sulfonated carbon quantum dot is modified with hydroxyl, carboxyl and sulfonic group. A preparation method of the sulfonated carbon quantum dots includes: taking biomass as a raw material, using a hydrogen peroxide assisted hydrothermal method to prepare carbon quantum dots with hydroxyl and carboxyl on the surfaces, sulfonating the carbon quantum dots, and connecting the sulfonic groups on the surfaces of the carbon quantum dots to obtain the sulfonated carbon quantum dots. The sulfonated carbon quantum dots can serve as a catalyst for catalyzing fructose dehydration to prepare5-hydroxymethyl furfuraldehyde and have high fructose conversion activity, high 5-hydroxymethyl furfuraldehyde yield and excellent stability.

Description

technical field [0001] The invention relates to a sulfonated carbon quantum dot, its preparation method and its application as a catalyst in the reaction of catalyzing the dehydration of fructose to prepare 5-hydroxymethylfurfural. Background technique [0002] Traditional fossil resources are increasingly depleted and cannot be relied on by humans for a long time. Biomass energy has a wide range of sources, low price, and abundant reserves, making it an ideal renewable energy source. In recent years, 5-hydroxymethylfurfural has been recognized as a potential and representative new biomass platform compound, which has important applications in medicine, plastics, rubber and other fields. [0003] In the preparation of 5-hydroxymethylfurfural, the choice of catalyst is the key. Compared with homogeneous catalysts such as sulfuric acid and hydrochloric acid, heterogeneous catalysts such as molecular sieves, acidic resins, metal-organic frameworks, and carbon materials have t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00B01J27/02B01J37/10C07D307/46
CPCY02P20/584
Inventor 张建王磊胡耀平高志谨
Owner ZHEJIANG SUGAR ENERGY TECH CO LTD
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