A kind of magnetic carbon nanotube composite material doped with molecular sieve and its preparation method and application

A technology of magnetic carbon nanotubes and composite materials, which is applied in the field of nanomaterials, can solve problems such as the difficulty of separating carbon nanotubes from water, and achieve the effects of repeated use, high removal rate, and resolution of separation difficulties

Active Publication Date: 2021-10-19
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the carbon nanotubes are loaded with magnetic iron oxides, the adsorption material can be separated from water by magnetic separation technology, which solves the problem of difficult separation of carbon nanotubes and water, and can be recycled, regenerated and reused. It is an efficient method for removing ammonia nitrogen in water. A new type of adsorbent material that can be recycled and regenerated

Method used

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  • A kind of magnetic carbon nanotube composite material doped with molecular sieve and its preparation method and application
  • A kind of magnetic carbon nanotube composite material doped with molecular sieve and its preparation method and application
  • A kind of magnetic carbon nanotube composite material doped with molecular sieve and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1.① Weigh 0.5000g of carbon nanotubes, suspend them in 125mL of distilled water, and put the suspension under ultrasonic frequency of 45KHz and power of 0.4W / cm 2 Under the conditions, ultrasonic dispersion was carried out for 15 minutes; according to carbon nanotubes and Fe 3 o 4 The mass ratio is 5:2, the molar ratio of ferrous iron to ferric iron (Fe 2+ / Fe 3+ ) is 1:1.43, respectively weigh ferrous ammonium sulfate and ferric ammonium sulfate. Dissolve the weighed ferric ammonium sulfate in 75mL of distilled water, and heat the solution in a constant temperature water bath at 60°C; weigh 0.5000g of anhydrous calcium chloride. Dissolve the weighed anhydrous calcium chloride in 75mL of distilled water, and heat the solution in a constant temperature water bath at 60°C;

[0045] ② According to anhydrous Na 2 CO 3 Prepare a mixed alkali solution with NaOH at a molar ratio of 5:3, and heat it in a constant temperature water bath at 60°C;

[0046] ③Heating the soni...

Embodiment 2

[0056] The difference from Example 1 is that: in step 2, according to the mass ratio of magnetic carbon nanotubes, sodium metaaluminate and sodium silicate to 3:8:80, respectively weigh magnetic carbon nanotubes, sodium metaaluminate and silicic acid Sodium: Dissolve sodium metaaluminate in 10mL of distilled water, add magnetic carbon nanotubes into the sodium metaaluminate solution, and place the mixed suspension in a water bath with a stirring speed of 100r / min under magnetic stirring conditions and heat to 60°C .

[0057] ② Prepare 250 mL of 2 mol / L sodium hydroxide solution; then add sodium silicate to the sodium hydroxide solution, and add 50 mL of distilled water to completely dissolve the sodium silicate.

[0058] ③Keep the constant temperature at 60°C and stir at 100r / min, and slowly titrate with the mixed solution of sodium silicate and sodium hydroxide in ①in the mixed suspension of magnetic carbon nanotubes and sodium metaaluminate. At this temperature, the reactio...

Embodiment 3

[0062] The difference from Example 1 is that: in step 2, according to the mass ratio of magnetic carbon nanotubes to sodium metaaluminate and sodium silicate as 3:6:60, respectively weigh magnetic carbon nanotubes, sodium metaaluminate and silicic acid Sodium: Dissolve sodium metaaluminate in 10mL of distilled water, add magnetic carbon nanotubes to the sodium metaaluminate solution, and place the mixed suspension in a water bath with a stirring speed of 200r / min under magnetic stirring conditions and heat to 30°C .

[0063] ② Prepare 250 mL of 2 mol / L sodium hydroxide solution; then add sodium silicate to the sodium hydroxide solution, and add 50 mL of distilled water to completely dissolve the sodium silicate.

[0064] ③Keep the constant temperature at 30°C and stir at 200r / min, slowly titrate with the mixed solution of sodium silicate and sodium hydroxide in ①in the mixed suspension of magnetic carbon nanotubes and sodium metaaluminate, after the titration is completed At ...

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Abstract

The invention belongs to the field of nanometer materials, and discloses a magnetic carbon nanotube composite material doped with molecular sieves, a preparation method and application thereof. The carbon nanotube composite is a carbon nanotube loaded with magnetic iron oxide and CaCO 3 , to obtain magnetic carbon nanotubes, and then doped molecular sieves to the magnetic carbon nanotubes. The magnetic carbon nanotubes doped with molecular sieves of the present invention have a high removal rate of ammonia nitrogen in water, and the removal rate of ammonia nitrogen can reach more than 80% when adsorbed for 30 minutes, and can reach more than 90% when adsorbed for 45 minutes; at the same time, the composite material is loaded with magnetic iron The oxide makes it magnetic, and it can be quickly separated and recovered from water by magnetic separation, and regenerated by NaOH+NaCl solution, with a regeneration rate as high as 107.57%. The composite material's efficient adsorption and regeneration of ammonia nitrogen in water makes it have a broad application prospect in the removal of ammonia nitrogen in slightly polluted water source water.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and more specifically relates to a magnetic carbon nanotube composite material doped with molecular sieves and its preparation method and application. Background technique [0002] With the increasingly serious problem of water pollution, most of the water sources in our country are polluted. Among the polluted water sources, the slightly polluted water sources are slightly polluted. Ammonia nitrogen is one of the main pollutants in slightly polluted water sources. Ammonia nitrogen in water will affect the effect of water purification process. For example, when chlorine is used for disinfection, ammonia nitrogen will react with chlorine gas to form chloramine, which will significantly reduce the disinfection efficiency of chlorine, resulting in an increase in the amount of chlorine added, which may lead to disinfection by-products. Increase. Residual ammonia nitrogen in the water supply ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J20/34C02F1/28C02F1/42C02F101/16
CPCB01J20/043B01J20/06B01J20/18B01J20/205B01J20/28009B01J20/3475C02F1/288C02F1/42C02F2001/425C02F2101/16
Inventor 李绍秀潘郑宇赖婵黄素王志红李冬梅蒋树贤冯力
Owner GUANGDONG UNIV OF TECH
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