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A method for removing scale and heavy metal ions in water

A heavy metal ion and water removal technology, applied in the field of water treatment, can solve the problems of weak adsorption capacity of graphene/carbon nanotube composite materials, agglomeration of graphene and carbon nanotubes, and low orderly arrangement of carbon nanotubes, etc. The effect of mild conditions, good adsorption capacity and convenient operation

Active Publication Date: 2019-03-22
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently reported methods for preparing graphene / carbon nanotubes all have shortcomings such as low order arrangement of carbon nanotubes between graphene layers, serious agglomeration of graphene and carbon nanotubes, etc.
In addition, there are fewer functional groups on the surface of the composite material, which makes the adsorption capacity of the graphene / carbon nanotube composite material weak

Method used

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  • A method for removing scale and heavy metal ions in water
  • A method for removing scale and heavy metal ions in water
  • A method for removing scale and heavy metal ions in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1 Pretreatment of carbon nanotubes:

[0035] Disperse 1g of original multi-walled carbon nanotubes (prepared by chemical vapor deposition) into a mixed acid solution consisting of 30ml of concentrated sulfuric acid and 10ml 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 Reserve after 12 hours.

[0036] The preparation of step 2 graphene oxide:

[0037] 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; r...

Embodiment 2

[0044] Step 1 Pretreatment of carbon nanotubes:

[0045] Disperse 2 g of original multi-walled carbon nanotubes (prepared by chemical vapor deposition) into a mixed acid solution of 60 ml of concentrated sulfuric acid and 20 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 Stand by after hours.

[0046] The preparation of step 2 graphene oxide:

[0047] Take 4g of natural flake graphite with an electronic balance, use a measuring cylinder to measure 92ml of concentrated sulfuric acid and pour it into a 1000ml three-neck bottle, cool to 0~5°C, add the weighed 4g of natural graphite into 92ml of concentrated sulfuric acid , use an ice bath to cool 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, keep the temperature of the mixture below 10°C and continue stirring for 2.5...

Embodiment 3

[0054] Step 1 Pretreatment of carbon nanotubes:

[0055] Disperse 0.5g of original multi-walled carbon nanotubes (prepared by chemical vapor deposition) into a mixed acid solution of 15ml of concentrated sulfuric acid and 5ml 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 Reserve after 12 hours.

[0056] The preparation of step 2 graphene oxide:

[0057] Use an electronic balance to take 2g of natural flake graphite, 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 natural graphite to 92ml of concentrated sulfuric acid , use an ice bath to cool 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, keep the temperature of the mixture below 10°C and continue stirring for 2.5 hours;...

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Abstract

The invention discloses a method capable of removing limescale and heavy metal ions in water and relates to the water treatment technology. The method capable of removing the limescale and the heavy metal ions in the water includes the steps of ultrasonically dispersing purified carbon nanotubes in anhydrous ethanol, mixing the dispersion liquid with dispersion liquid of oxidized graphene in the anhydrous ethanol, and subjecting the mixed liquid to ultrasonic treatment prior to suction filtration and vacuum drying so as to obtain oxidized graphene / carbon nanotube composite materials. The composite materials belonging to nanomaterials have excellent properties and comprise multiple kinds of active groups such as hydroxyl and carboxyl on the surfaces. The method capable of removing the limescale and the heavy metal ions in the water has the advantages that the method can remove pollutants through adsorptive effect of the surface groups and the heavy metal ions in sewage and is synergistic with the composite materials under the action of an applied magnetic field to remove the limescale; the method with secondary-pollution-free and adsorptive functions is simple in technological process and reliable in property so as to be applicable to such fields as targeted drug preparation, environment protection and pollutant monitoring; the method is simple in material preparation and low in cost and can be produced massively.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to the technology of removing scale and heavy metal ions in water. 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 applications in many fields. After the two are prepared into a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C01B32/198C01B32/17C02F1/28C02F101/20C02F101/30
CPCC01P2002/82C01P2004/04C02F1/281C02F2101/20C02F2101/30
Inventor 姜丽丽于海涛侯新刚
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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