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A method for efficiently removing heavy metal ions and organic matter in water

A technology for removing heavy metal ions and water, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc. Convenient operation, increased specific surface area, excellent effect of adsorption and separation process

Active Publication Date: 2020-03-17
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few reports on the synergistic effect of magnetic field and adsorbent. Most of the reports are on the modification of graphene / carbon nanotube composite materials, but the modification method is complicated, the efficiency of introducing functional groups is low, and the degree of functionalization is not high.
In addition, due to the low efficiency of introducing functional groups, there are also disadvantages such as few surface active groups and weak adsorption capacity of graphene / carbon nanotube composites.

Method used

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  • A method for efficiently removing heavy metal ions and organic matter in water
  • A method for efficiently removing heavy metal ions and organic matter in water
  • A method for efficiently removing heavy metal ions and organic matter in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1 Pretreatment of carbon nanotubes:

[0038] 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 Stand by after hours.

[0039] The preparation of step 2 graphene oxide:

[0040] Use an electronic balance to take 2g of natural flake graphite; measure 50ml of concentrated sulfuric acid in a measuring cylinder and pour it into a 1000ml three-neck bottle, cool it to 0~5°C, add the weighed 2g of graphite into 50ml 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 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....

Embodiment 2

[0051] Step 1 Pretreatment of carbon nanotubes:

[0052] 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.

[0053] The preparation of step 2 graphene oxide:

[0054] Use an electronic balance to take 1g of natural flake graphite; measure 25ml of concentrated sulfuric acid in a measuring cylinder and pour it into a 1000ml three-neck bottle, cool to 0~5°C, add the weighed 1g of graphite to 25ml 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 0.5g of sodium nitrate and 3g of potassium permanganate at a certain speed while stirring vigorously to keep the temperature of the mixture below 10°C and continue stirring for 2.5 hours;...

Embodiment 3

[0064] Step 1 Pretreatment of carbon nanotubes:

[0065] Disperse 0.2g of original multi-walled carbon nanotubes (prepared by chemical vapor deposition) into a mixed acid solution of 6ml of concentrated sulfuric acid and 2ml 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.

[0066] The preparation of step 2 graphene oxide:

[0067] Use an electronic balance to take 1g of natural flake graphite; measure 23ml of concentrated sulfuric acid in a measuring cylinder and pour it into a 1000ml three-neck bottle, cool it to 0~5°C, add the weighed 1g of graphite to 23ml 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 0.5g of sodium nitrate and 3g of potassium permanganate at a certain speed while stirring vigorously to keep the temperature of the mixture below 10°C and continue stirring for 2.5 hour...

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Abstract

A method of efficiently removing heavy metal ions and organic matters in water relates to a water treatment technique and is characterized in that purified carbon nanotubes are ultrasonically dispersed in absolute ethyl alcohol, the dispersed material is subjected to mixed ultrasonic treatment with absolute ethyl alcohol dispersion containing graphene oxide, and suction filtering and drying are performed to obtain amino and thiol modified graphene oxide / carbon nanotube composite; the composite above is dispersed in mixed solution of absolute ethyl alcohol, acetic acid, acetone and trimethoxysilylpropanethiol, nitrogen is introduced for protection, suction filtering, separating and drying are performed after reaction, the dried material is dispersed in absolute ethyl alcohol solution, hydrazine is added under nitrogen protection, washing with water and absolute ethyl alcohol is performed after reaction, and vacuum drying is performed to obtain amino and thiol modified graphene / carbon nanotube composite; under the action of an external magnetic field, the composite is added to circulating water containing heavy metal ions and organic matters in order for adsorbing.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to the technology for removing heavy metal ions and organic matter in water. Background technique [0002] Iijima S, a Japanese electron microscope scientist, and Andre Geim and Konstantin Novoselov, two scientists from the University of Manchester in the UK, first discovered two new types of carbon materials, carbon nanotubes and graphene, in 1991 and 2004 respectively. The structure, excellent conductivity, large specific surface area, light mass density, and strong interaction with pollutant molecules have quickly attracted widespread attention from scholars in various fields at home and abroad. However, the surface of carbon nanotubes and graphene has hydrophobicity and high surface energy, and they are easy to reunite and fold with each other, and are not easy to dissolve in various solvents, so the application is greatly limited. In order to improve the dispersibility...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/48B01J20/22C02F101/30C02F101/20
CPCB01J20/20B01J20/205B01J20/22C02F1/285C02F1/48C02F2101/20C02F2101/30
Inventor 姜丽丽于海涛侯新刚
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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