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Method for preparing magnetic carbon nano-tube adsorbent having high adsorption capacity and used for removing dye from aqueous phase

A technology of magnetic carbon nanotubes and carbon nanotubes, applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the complex process and limit the development of magnetic carbon nanotube adsorbents and application issues, to achieve the effect of simple process, good adsorption and enrichment characteristics, and improved hydrophobicity

Inactive Publication Date: 2012-07-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of traditional magnetic iron oxide / carbon nanotube hybrid material adsorbents has disadvantages such as complicated process. The existence of the above problems affects and limits the further development and application of magnetic carbon nanotube adsorbents. Therefore, the development of magnetic carbon nanotube adsorbents that can be used in acidic environments The high-capacity new magnetic carbon nanotube adsorbent is of great significance to reduce the cost of the adsorbent, increase the adsorption capacity, prolong the life, and promote the practical promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 1.0 g of dried unpurified carbon nanotube raw sample powder, mix and grind it with potassium hydroxide at a mass ratio of 1:6; heat up to a reaction temperature of 750 °C at a rate of 15 °C / min in a quartz tube furnace , the nitrogen flow rate is 8L / h , the reaction time is 1 hour, cool down and take it out, then repeatedly rinse with deionized water, filter the carbon nanotubes until the pH value of the solution reaches 7; disperse the obtained activated carbon nanotubes in alcohol, and put them in a vacuum oven at 120°C for drying , to obtain the activated carbon nanotube adsorption material with good water solubility. The modified magnetic carbon nanotube sample is filtered, washed with water, and vacuum-dried to obtain a magnetic carbon nanotube high-capacity adsorbent. 30 mg of this material was added to 40 mL of a methyl orange concentration of 50 mg / L solution, and the adsorbent was magnetically separated from the solution, and the solution after reaching...

Embodiment 2

[0023] Weigh 1.0 g of dried unpurified carbon nanotube raw sample powder, mix and grind it with potassium hydroxide at a mass ratio of 1:4; heat up to a reaction temperature of 750 °C at a rate of 15 °C / min in a quartz tube furnace , the nitrogen flow rate is 8L / h , the reaction time is 1 hour, cool down and take it out, then repeatedly rinse with deionized water, filter the carbon nanotubes until the pH value of the solution reaches 7; disperse the obtained activated carbon nanotubes in alcohol, and put them in a vacuum oven at 120°C for drying , to obtain the activated carbon nanotube adsorption material with good water solubility. The modified magnetic carbon nanotube sample is filtered, washed with water, and vacuum-dried to obtain a magnetic carbon nanotube high-capacity adsorbent. 30 mg of this material was added to 40 mL of a methyl orange concentration of 50 mg / L solution, and the adsorbent was magnetically separated from the solution, and the solution after reaching...

Embodiment 3

[0025] Weigh 1.0 g of dried unpurified carbon nanotube raw sample powder, mix and grind it with potassium hydroxide at a mass ratio of 1:2; heat up to a reaction temperature of 750 °C at a rate of 15 °C / min in a quartz tube furnace , the nitrogen flow rate is 8L / h , the reaction time is 1 hour, cool down and take it out, then repeatedly rinse with deionized water, filter the carbon nanotubes until the pH value of the solution reaches 7; disperse the obtained activated carbon nanotubes in alcohol, and put them in a vacuum oven at 120°C for drying , to obtain the activated carbon nanotube adsorption material with good water solubility. The modified magnetic carbon nanotube sample is filtered, washed with water, and vacuum-dried to obtain a magnetic carbon nanotube high-capacity adsorbent. 30 mg of this material was added to 40 mL of a methyl orange concentration of 50 mg / L solution, and the adsorbent was magnetically separated from the solution, and the solution after reaching...

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Abstract

The invention relates to a method for preparing a magnetic carbon nano-tube adsorbent having high adsorption capacity and used for removing a dye from an aqueous phase. The method comprises the following steps of: mixing an original sample of unpurified carbon nano-tubes and potassium hydroxide powder, and grinding uniformly; putting into a reaction container, introducing insert gas, reacting, raising to certain temperature, and regulating carrier gas; and continuously reacting for several hours, filtering a reaction product, washing, and performing vacuum drying to obtain the magnetic carbon nano-tube composite adsorbent. A solid-phase oxidant is used for modifying a surface structure of the carbon nano-tubes, so that the specific surface area and hydrophilic nature of the carbon nano-tubes are remarkably improved, and the hydrophobic property of the carbon nano-tubes and the dispersion performance of the carbon nano-tubes in an aqueous solution are improved; and the adsorbent can be conveniently and quickly separated and recovered by a magnetic separation technology, so that secondary environmental pollution is avoided. In addition, raw materials are readily available, the preparation process is simple and low in cost, and is suitable for continuous large-scale batch production, and conditions are easy to control.

Description

technical field [0001] The invention belongs to the technical field of environmental nano new functional materials, and in particular relates to a preparation method of a magnetic carbon nanotube adsorbent with high adsorption capacity for removing dyes in aqueous phase. The adsorbent is used for fast adsorption and removal of dyes in aqueous solution, while ensuring adsorption After use, the agent powder can be separated and recovered from the aqueous solution by applying an external magnetic field. Background technique [0002] With the rapid development of my country's printing and dyeing industry and chemical industry, about 600-700 million tons of printing and dyeing wastewater are discharged into the environment every year, and dye wastewater has become one of the key sources of environmental pollution. The dye industry has a variety of varieties and complex processes. Dye wastewater has the characteristics of complex components, high chroma, high COD and BOD concentra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28
Inventor 马杰陈君红杨明轩张雪郭文瑞高振威
Owner TONGJI UNIV
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