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Thiol-modified graphene/carbon nanotube composite material and preparation method

A technology of carbon nanotubes and composite materials, applied in the field of nanomaterials, can solve the problems of low efficiency of functional group introduction, low degree of functionalization, and few surface active groups, and achieve the effect of convenient operation, good attraction, and mild conditions

Inactive Publication Date: 2019-01-22
甘肃筑业建设科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The currently reported methods for thiolating graphene / carbon nanotubes all have the following disadvantages: complex modification, low efficiency of functional group introduction, and low degree of functionalization
Due to the low efficiency of introducing functional groups, the graphene / carbon nanotube composites have fewer surface active groups and weak adsorption capacity

Method used

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  • Thiol-modified graphene/carbon nanotube composite material and preparation method
  • Thiol-modified graphene/carbon nanotube composite material and preparation method
  • Thiol-modified graphene/carbon nanotube composite material and preparation method

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preparation example Construction

[0015] The preparation method of the graphene / carbon nanotube composite material of described thiol group modification, its steps are:

[0016] (1) Disperse carbon nanotubes in a mixed acid solution, react at 60-80°C for 1-3 hours, then filter and wash, and dry at 80-120°C for 8-12 hours to obtain purified carbon nanotubes;

[0017] (2) Add natural graphite to concentrated sulfuric acid with a mass fraction of 98%, stir mechanically until the graphite is completely dissolved, then add sodium nitrate and potassium permanganate to keep the temperature at 0~10°C, continue stirring for 2.5~4 hours, and Put the mixture in a constant temperature water bath at 35°C, slowly add deionized water, then put the mixture in a water bath at 90~100°C and stir mechanically for 20~40 minutes, add deionized water to dilute to 600ml, and stir for 5-15 minutes , adding 30% hydrogen peroxide by mass fraction, centrifuging the product at a speed of 8000-10000r / min, dispersing the centrifuged solid m...

Embodiment 1

[0025] Step 1, pretreatment of carbon nanotubes:

[0026] Disperse 1 g of original multi-walled carbon nanotubes (prepared by chemical vapor deposition) into a mixed acid solution of 30 ml of concentrated sulfuric acid and 10 ml of concentrated nitric acid, stir and react at 60°C for 3 hours, wash with distilled water until neutral, and dry in vacuum at 80°C for 12 standby after hours;

[0027] Step 2, the preparation of graphene oxide:

[0028] Take 2g of natural flake graphite with an electronic balance, use a graduated cylinder to measure 46ml of concentrated sulfuric acid and pour it into a 1000ml three-neck bottle, cool to 0~5°C, add the weighed 2g of graphite to 46ml of concentrated sulfuric acid, Use an ice bath to cool to 0~5°C and stir until the graphite is completely dissolved, add 1g of sodium nitrate and 6g of potassium permanganate at a certain speed while stirring vigorously, keep the temperature of the mixture below 10°C and continue stirring for 2.5 hours; rem...

Embodiment 2

[0034] Step 1, pretreatment of carbon nanotubes:

[0035] Disperse 2g of original multi-walled carbon nanotubes (prepared by chemical vapor deposition method) into the mixed acid solution of concentrated sulfuric acid and concentrated nitric acid, the volumes of which are 60ml and 20ml respectively, stir and react at 60°C for 3 hours, wash with distilled water until neutral , dried under vacuum at 80°C for 12 hours for later use;

[0036] Step 2, the preparation of graphene oxide:

[0037] Use an electronic balance to take 4g of natural flake graphite; measure 92ml of concentrated sulfuric acid in a graduated cylinder and pour it into a 1000ml three-neck bottle, cool it to 0~5°C, add the weighed 4g of graphite to 92ml of concentrated sulfuric acid, and use Cool in an ice-water bath to 0~5°C and stir until the graphite is completely dissolved. Add 2g of sodium nitrate and 12g of potassium permanganate at a certain speed while stirring vigorously to keep the temperature of the ...

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Abstract

The invention discloses a thiol-modified graphene / carbon nanotube composite material and a preparation method therefor. The preparation method comprises the steps of dispersing purified carbon tubes into absolute ethyl alcohol in an ultrasonic manner; then mixing with an absolute ethyl alcohol dispersion liquid of graphene oxide; next, performing ultrasonic processing, suction filtration and vacuum drying to obtain a graphene / carbon nanotube composite material; preparing acetic acid, acetone and 3-mercaptopropyl trimethoxy silane into a mixed solution; and next, dispersing the composite material to the mixed solution, pumping nitrogen for protection, reacting, and then performing suction filtration and vacuum drying to obtain the thiol-modified graphene / carbon nanotube composite material. The composite material belongs to a nanomaterial and has excellent characteristics of the nanomaterial; rapid separation of the composite material can be realized through a simple centrifuging operation; in addition, multiple kinds of active groups are on the surface of the composite material; and through a complexing action between the groups on the surface and heavy metal ions and organic pollutants in water, removal of pollutants can be realized.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to the preparation technology of graphene / carbon nanotube composite material modified by mercaptan groups. Background technique [0002] Two new carbon materials, carbon nanotubes and graphene, were discovered in 1991 and 2004 by Japanese electron microscope scientist Iijima S and two scientists Andre Geim and Konstantin Novoselov from the University of Manchester, UK. These two new carbon materials have many advantages. Such as excellent electrical conductivity, large specific surface area, unique spatial structure, light mass density, and strong interaction with pollutant molecules, etc., have set off a research boom in various fields at home and abroad. However, these two new carbon materials also have many disadvantages, such as easy agglomeration, entanglement, and folding, high surface energy, and insoluble in various solvents, which limit their applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20C02F101/30
CPCB01J20/20B01J20/205C02F1/288C02F2101/20C02F2101/30
Inventor 姜丽丽李传通于海涛侯新刚
Owner 甘肃筑业建设科技发展有限公司
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