Preparation and application of three-dimensional bulk-phase graphene-based cobalt-based MOFs (metal-organic frameworks) composite materials

A technology of alkenyl cobalt-based and composite materials, which is applied in the preparation of amino hydroxyl compounds, the preparation of organic compounds, organic compounds/hydrides/coordination complex catalysts, etc., and can solve the problems of ecological environment, physical health damage, toxicity, etc. Achieve the effect of enhanced electrical conductivity, simple preparation method, and easy recovery

Active Publication Date: 2018-11-27
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main use of 4-nitrophenol is in the production of pesticides such as colorants, insecticides and herbicides, and in the chemical industry, but this type of co...

Method used

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  • Preparation and application of three-dimensional bulk-phase graphene-based cobalt-based MOFs (metal-organic frameworks) composite materials
  • Preparation and application of three-dimensional bulk-phase graphene-based cobalt-based MOFs (metal-organic frameworks) composite materials
  • Preparation and application of three-dimensional bulk-phase graphene-based cobalt-based MOFs (metal-organic frameworks) composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 20 mg of graphene oxide and dissolve it in 10 mL of deionized water, and ultrasonically disperse for 4 h to obtain a uniformly dispersed GO hydrosol with a mass concentration of 2 mg / mL.

[0031] Weigh 0.87g Co(NO 3 ) 2 ·6H 2 O was dissolved in 30mL methanol solution, and 20mL methanol solution containing 1.97g 2-methylimidazole was quickly added to form a uniform purple solution, and then the purple solution was left to stand at room temperature for 20h, and the product was washed repeatedly with methanol and deionized water, and then The cobalt-based MOFs material ZIF-67 was obtained by freeze-drying.

[0032] Weigh 1 mg of ZIF-67 and add it to the 2 mg / mL GO aqueous sol that was uniformly dispersed by ultrasound, stir magnetically and disperse with ultrasound to completely disperse ZIF-67 into the GO solution, and then transfer it to the reaction kettle, at 160°C After reacting for 30 hours, the bulk product was repeatedly soaked and washed with deionized wa...

Embodiment 2

[0034] The preparation method of GO hydrosol and ZIF-67 is the same as that in Example 1.

[0035] Weigh 3mg of ZIF-67 and add it to the 2mg / mL GO aqueous sol that was homogeneously dispersed by ultrasound, stir magnetically and supplemented by ultrasonic dispersion, so that ZIF-67 is completely dispersed into the GO solution, and then transferred to the reaction kettle, at 160°C After reacting for 30 hours, the bulk product was repeatedly soaked and washed with deionized water, and finally placed in a vacuum drying oven at 40°C for 8 hours to obtain three-dimensional graphene-based cobalt-based MOFs (3D GO / ZIF-67) (2:3 ) composite material.

Embodiment 3

[0037] The preparation method of GO hydrosol and ZIF-67 is the same as that in Example 1.

[0038] Weigh 5mg of ZIF-67 and add it to the 2mg / mL GO aqueous sol that was uniformly dispersed by ultrasound, stir magnetically and disperse by ultrasound to completely disperse ZIF-67 into the GO solution, then transfer it to the reaction kettle, and set the temperature at 160°C After reacting for 30 hours, the bulk product was repeatedly soaked and washed with deionized water, and finally placed in a vacuum drying oven at 40°C for 8 hours to obtain three-dimensional graphene-based cobalt-based MOFs (3D GO / ZIF-67) (2:5 ) composite material.

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Abstract

The invention discloses a method for preparing three-dimensional bulk-phase graphene-based cobalt-based MOFs (metal-organic frameworks) composite materials and application thereof, and belongs to thetechnical field of inorganic material synthesis. The method particularly includes synthesizing dodecahedral ZIF-67 (Co-based zeolitic imidazolate frameworks-67) by the aid of liquid-phase diffusion processes; sufficiently uniformly mixing the ZIF-67 and ultrasonically dispersed graphene aqueous solution with one another; preparing the novel three-dimensional bulk-phase graphene-based cobalt-basedMOFs (3D GO/ZIF-67) composite materials by the aid of hydrothermal processes. The three-dimensional bulk-phase graphene-based cobalt-based MOFs composite materials can be used as catalysts to be applied to carrying out reduction on 4-nitrophenol to obtain 4-aminophenol. The method and the application have the advantages that as shown by test results, the catalytic activity of the three-dimensionalbulk-phase graphene-based cobalt-based MOFs composite materials can be obviously enhanced as compared with single ZIF-67 materials; the method for preparing the three-dimensional bulk-phase graphene-based cobalt-based MOFs composite materials is simple and convenient, the three-dimensional bulk-phase graphene-based cobalt-based MOFs composite materials are low in usage when used as the catalysts;the three-dimensional bulk-phase graphene-based cobalt-based MOFs composite materials comprise catalytic materials in magnetic bulk phase, accordingly, the catalysts are easy to recycle, and the method is green and is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of inorganic material synthesis, and in particular relates to a method for conveniently preparing a three-dimensional bulk graphene-based cobalt-based MOFs composite material (3D GO / ZIF-67) and the composite material's reaction to 4-nitrate in the presence of sodium borohydride Applications for the reduction of phenols. Background technique [0002] Metal-Organic Frameworks (MOFs) are new types of crystalline porous three-dimensional structure materials composed of metal ions or metal clusters bridged with organic ligands. The material has the characteristics of well-defined porosity, adjustable chemical composition, high specific surface area and regular structure, which makes it widely used in chemical separation, biomolecular adsorption materials, photoelectric catalysis and other fields. Among them, ZIF-67 (Co-based Zeolitic Imidazolate Framework) is a cobalt-based MOFs material with a zeolite-like imid...

Claims

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Application Information

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IPC IPC(8): B01J31/16B01J35/02C07C213/02C07C215/76
CPCB01J31/1691B01J35/02C07C213/02C07C215/76
Inventor 魏先文李晓柠吴芳辉赵自豪程源晟储心萍
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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