Preparation method, use method and applications of magnetic carbon nano-tubes

A magnetic carbon nanotube and carbon nanotube technology, applied in the field of environment and chemistry, can solve the problems of difficult solid-liquid separation of carbon nanotube adsorbents, and achieve the effects of good magnetic separation performance, improved adsorption performance, and easy control of conditions.

Inactive Publication Date: 2019-01-22
TIANJIN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, aiming at the difficult technical situation of solid-liquid separation of carbon nanotube adsorbents, to propose a method for the preparation and use of magnetic carbon nanotubes, and to use it for various pollution in water Removal of matter

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  • Preparation method, use method and applications of magnetic carbon nano-tubes
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  • Preparation method, use method and applications of magnetic carbon nano-tubes

Examples

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preparation example Construction

[0026] The preparation method of magnetic carbon nanotube of the present invention comprises the following steps:

[0027] The first step: at room temperature, prepare a certain amount of aqueous solution containing manganese dichloride (0.125mol / L) and ferric chloride (0.25mol / L) in a conical flask to form a stable homogeneous system (wherein the molar ratio Mn:Fe=1:2).

[0028] Step 2: Weigh an appropriate amount of carbon nanotubes, add to the solution prepared in the first step, and stir evenly.

[0029] The carbon nanotubes used are single-wall, double-wall or multi-wall carbon nanotubes, and the carbon nanotubes are original samples of carbon nanotubes, which can be prepared by arc method or chemical vapor deposition or laser method original samples of carbon nanotubes. The quality of the carbon nanotubes used and the MnFe produced in the third step 2 o 4 The mass ratio is 1:1-1:5.

[0030] The third step: at a certain stirring speed, the temperature of the water ba...

Embodiment 1

[0036] Embodiment 1: Preparation of magnetic carbon nanotubes

[0037] A loaded MnFe 2 o 4 The preparation method of the carbon nanotube adsorbent of magnetic nanoparticles, the specific steps are as follows:

[0038] 1. Magnetic seed preparation: at room temperature, prepare 200ml of an aqueous solution containing manganese dichloride (0.025mol) and ferric chloride (0.05mol) in a 250ml Erlenmeyer flask to form a stable homogeneous system, denoted as solution A .

[0039] 2. Preparation of carbon nanotubes: Weigh 5.7735 g of multi-walled carbon nanotubes with a ten-thousandth balance, add them into solution A and stir evenly to obtain mixed solution B.

[0040] 3. Preparation of magnetic carbon nanotubes: under constant stirring, the temperature of the mixed liquid B in a water bath was raised to 60° C., and 3 mol / L sodium hydroxide solution was added dropwise to adjust the pH to 11, and the temperature was kept for 1 hour. Finally, keep warm in a 100°C water bath for 4 ho...

Embodiment 2

[0042] Example 2: Adsorption performance of magnetic carbon nanotubes

[0043]According to the magnetic carbon nanotubes prepared in Example 1, experiments on the adsorption and removal effects of humic acid, methylene blue, methyl orange, copper, tetracycline and phosphate ions in water were carried out. Take 10mg of magnetic carbon nanotubes and add them to 50ml of the above-mentioned pollutants, absorb in a shaker at 25°C and 140rpm for 24 hours, and then take samples. The samples are filtered through a 0.45um membrane and tested. The results are shown in Table 1:

[0044] Table 1

[0045]

[0046] It can be seen from Table 1 that the removal rates of magnetic carbon nanotubes to humic acid, methylene blue, methyl orange, copper ions, tetracycline and phosphate changed from the original 89.8%, 99.6%, 99.5%, 3.4%, 98.8% and 89.3 88.0%, 99.%, 98.6%, 34.8%, 99.0% and 93.8%, basically maintaining the same adsorption performance as carbon nanotubes; the adsorption and remova...

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Abstract

The invention discloses a preparation method, a use method and applications of magnetic carbon nano-tubes. The preparation method comprises: preparing a certain amount of an aqueous solution containing manganese chloride and ferric chloride in a conical flask; adding an appropriate amount of carbon nano-tubes, and stirring uniformly; under a certain stirring speed, carrying out water bath heatingto a temperature of 50-70 DEG C, adding a sodium hydroxide solution, and adjusting the pH value to 9-11; carrying out thermal insulation for 4 h in a water bath pot; cooling, repeatedly rinsing with deionized water, carrying out magnetic separation from the aqueous solution, and drying so as to be spare; metering a certain volume of solutions respectively containing humic acid, methylene blue, methyl orange, phosphate radical, tetracycline and copper ions, and determining the concentrations of the six solutions; respectively weighing a certain amount of the magnetic carbon nano-tubes, adding to the six solutions respectively containing humic acid, methylene blue, methyl orange, phosphate radical, tetracycline and copper ions, adsorbing for 24 h in a 25 DEG C 140 rpm shaking table, respectively sampling, filtering the samples with a filtration membrane, and respectively detecting the concentrations. According to the present invention, the product is suitable for the removal of various pollutants in a water body.

Description

technical field [0001] The invention belongs to the technical field of environment and chemistry, and more specifically relates to a preparation, use method and application of magnetic carbon nanotubes. Background technique [0002] Adsorption technology is considered by the US EPA to be the most practical water treatment technology. Carbon nanotubes with excellent adsorption properties are used to remove environmental pollutants. However, the possible nanotoxic effects of carbon nanotubes have attracted widespread attention from scholars. Therefore, Efficient separation of carbon nanotubes from media is a critical issue that cannot be ignored. [0003] Conventional centrifugation and filtration cannot effectively achieve good solid-liquid separation, and magnetic separation technology has attracted more and more attention because of its high efficiency, rapidity, and economy. Nano MnFe 2 o 4 As a common soft magnetic material, it has large specific surface area and satur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/10C02F101/20C02F101/30C02F101/38
CPCB01J20/205B01J20/28009B01J20/30C02F1/281C02F1/283C02F2101/105C02F2101/20C02F2101/308C02F2101/38
Inventor 赵伟高赵鹏田一梅金超
Owner TIANJIN UNIV
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