Preparation method of magnetic graphene ternary composites based on click chemistry

Abstract

The invention relates to a preparation method of a magnetic graphene ternary composite material based on click chemistry. The preparation method comprises the following steps: adding 1.0-5.0 g of trivalent ferric salt to 10-50 ml of reactive solvent, and carrying out ultrasonic dispersion until a solution is clear; then adding 1.0-5.0 g of a stabilizer, carrying out ultrasonic dispersion for 0.1-0.5 h at the temperature of 50-60 DEG C, then adding 0.2-1.0 g of strong alkaline reagent and 5-20.0 mL of amine functional reagent, and carrying out ultrasonic dispersion until the solution is clear; adding 50-100 mg of graphene, carrying out ultrasonic dispersion for 0.3-1 h at the temperature of 50-60 DEG C, and then adding the mixed solution in a polytetrafluoroethylene high-pressure autoclave for reacting for 4-10 h; cooling to room temperature, carrying out magnetic separation, washing with ultrapure water for several times until the pH is 7.0, then washing with ethyl alcohol for several times, and drying to obtain the amino-modified magnetic graphene ternary composite material. The preparation method is simple in technology, controllable in functional group proportion, high in repeatability and the like, the prepared amino-modified magnetic graphene ternary composite material has the advantages of high magnetism, multiple functions and the like, and the prepared amino-modified magnetic graphene ternary composite material is relatively higher in application value and wide in application prospect.

Description

technical field [0001] The invention relates to the field of graphene, in particular to a method for preparing a magnetic graphene ternary composite material based on click chemistry. Background technique [0002] In 2004, graphene (Graphene Oxide, GO) was prepared by Geim and Novoselov, two Russian-born scientists at the University of Manchester, UK, through the tape stripping method. Graphene has excellent electrical, mechanical and thermal conductivity, and there are a large number of Active groups such as carboxyl, hydroxyl, and epoxy groups make it have good hydrophilicity, biocompatibility and easy chemical modification. Graphene, as an emerging carbon nanomaterial, has great potential application value in the pretreatment of sample analysis. Under normal circumstances, graphene is prone to irreversible aggregation and precipitation in water and organic media, which greatly limits the application of graphene. In view of this, the functional modification of graphene i...

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Problems solved by technology

Yang et al. used surface click functional modification to attack the epoxy groups on the surface of graphene oxide with amino-containing ionic liquid (IL-NH2), and realized the covalent bond functionalization of graphene oxide through affinity ring-opening reaction. Modification, although the graphene prepared by this method overcomes its solubility problem in water and organic media, there are still deficiencies such as solid-liquid phase separation difficulties in the sample processing process (H.Yang, C.Shan, F .Li, et al., Covalent functionalization of polydispersechemically-converted graphene sheets with amine-terminated ionic liquid, Chem.Commun.2009, 3880-3882.)

Yang et al. used edge click functional modification, and the magnetic nano-Fe 3 o 4 The introduction of graphene oxide through non-covalent bonding has prepared a magnetic graphene oxide binary composite material with good solid-liquid separation performance under the action of an external magnetic field. The reaction temperature and the pH of the reaction system are demanding, and the obtained nano-Fe 3 o 4 The particle size is not uniform, the shape is irregular, and its repeatability needs to be further improved (X.Yang, C.Chen, J.Li, et al., Graphene oxide and reduced grapheme oxide-iron oxide hybrid materials for the removal of organic and inorganic pollutants , RSC Adv.2012, 2, 8821.)

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