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Reduced graphene oxide with efficient tea matrix adsorption and purification and preparation method and application of reduced graphene oxide

A technology of graphene and tea, which is applied in the field of reduced graphene oxide and its preparation, can solve the problems of efficient adsorption and purification of tea substrates that have not yet been seen, and achieve the effect of cheap price, good purification effect and high purification effect

Active Publication Date: 2017-10-17
TEA RES INST CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no research report on the efficient adsorption and purification of tea substrates by amino-modified reduced graphene oxide materials

Method used

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  • Reduced graphene oxide with efficient tea matrix adsorption and purification and preparation method and application of reduced graphene oxide
  • Reduced graphene oxide with efficient tea matrix adsorption and purification and preparation method and application of reduced graphene oxide
  • Reduced graphene oxide with efficient tea matrix adsorption and purification and preparation method and application of reduced graphene oxide

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Experimental program
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Embodiment 1

[0027] Graphene oxide material is obtained by taking graphite through the Hummer method; according to the mass ratio of graphene oxide and small molecular amine as 1:0.1, graphene oxide and tri-n-butylamine, tert-butylamine, and ethylenediamine are taken; the graphene oxide material is ultrasonically Disperse in ethylene glycol solvent, ultrasonication for 1 h; add tri-n-butylamine, tert-butylamine, and ethylenediamine into the dispersion, and stir evenly; place in an oven at 180 °C, heat the solvent for 15 h; cool, centrifuge, Wash and dry to obtain the reduced graphene oxide material modified by tri-n-butylamine, tert-butylamine and ethylenediamine. The obtained material was characterized by XRD. from figure 1 It can be seen that the characteristic peak of graphene oxide is 10.7 o Disappeared, after amine modification, at 25 o New broad peaks appear on the left and right, which belong to the characteristic peaks of reduced graphene, and the results indicate that graphene ...

Embodiment 2

[0029] Graphene oxide material is prepared by taking graphite by Hummer method; according to the mass ratio of graphene oxide and small molecular amine as 1:0.5, graphene oxide and n-butylamine are taken; the graphene oxide material is ultrasonically dispersed in ethanol solvent, ultrasonically 1 h; add n-butylamine to the dispersion, stir evenly; place in an oven at 170 °C, solvent heat for 12 h; cool, centrifuge, wash, and dry to obtain n-butylamine-modified reduced graphene oxide material. The obtained material was characterized by XRD. See attached figure 1 .

Embodiment 3

[0031] The tri-n-butylamine-modified reduced graphene oxide obtained in Example 1 and the n-butylamine-modified reduced graphene obtained in Example 2 were further characterized by FTIR. After being modified by tri-n-butylamine and n-butylamine, graphene oxide is at 3379cm -1 The -OH peak weakens obviously, indicating that graphene oxide is reduced during the solvothermal process, and at 1552cm -1 、1440cm -1 The N-H peak and C-N peak appear at , indicating that tri-n-butylamine and n-butylamine have been successfully modified on the surface of reduced graphene oxide. See attached figure 2 .

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Abstract

The invention discloses reduced graphene oxide with efficient tea matrix adsorption and purification and a preparation method and application of the reduced graphene oxide and belongs to the technical field of product sample pretreatment. The reduced graphene oxide is obtained via amine functionalization of the graphene oxide. The reduced graphene oxide has the advantages that raw materials are easy to obtain, and the raw material is graphite which is low in price; small-molecule amine with carbon atoms less than 8 is reacted with the graphene oxide in a heat solvent, and the graphene oxide is reduced to form the reduced graphene oxide; meanwhile, amino of the small-molecule amine is reacted with carboxyl of the graphene oxide to form amido linkage, the generated reduced graphene oxide has rich polar groups of amido, carboxyl, hydroxyl, epoxy group and the like on the surface of the reduced graphene oxide, interaction force of the components high in content of coloring matter, alkaloid, tea polyphenol, saccharides and the like in a tea matrix is higher, and high matrix purification effect of the reduced graphene oxide is guaranteed; the functional reduced graphene oxide is large in adsorption capacity and good in purification effect.

Description

technical field [0001] The invention belongs to the technical field of pretreatment of agricultural product samples, and in particular relates to a reduced graphene oxide capable of efficiently adsorbing and purifying tea substrates, and a preparation method and application thereof. Background technique [0002] my country is the origin of tea trees, and tea production has a long history. Today, tea has become an indispensable drink in people's daily life. At present, my country's tea is sold at home and abroad, becoming the largest exporter. In order to ensure the health and safety of consumers, relevant countries and regions have set very strict maximum residue limits (MRLs) for pesticide residues in tea. The increasingly stringent limit standards in the international market have increasingly become an important means of technical trade barriers for developed countries or agricultural product importing countries. Therefore, it is particularly important to establish a fa...

Claims

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Application Information

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IPC IPC(8): C01B32/184B01J20/20B01J20/30
CPCB01J20/20C01B2204/20C01P2002/72C01P2002/80C01P2002/82
Inventor 马桂岑张明露刘新鲁成银
Owner TEA RES INST CHINESE ACAD OF AGRI SCI
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