Method for preparing magnetic active carbon composite material for water processing

A magnetic activated carbon and composite material technology, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, and other chemical processes, can solve the problems of not being able to make full use of the high specific surface of activated carbon, easy aggregation of magnetic particles, and unfavorable practical applications. Achieve the effects of stable magnetic properties, not easy to agglomerate, and large specific surface

Inactive Publication Date: 2009-08-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although, with MnFe 2 o 4 or CuFe 2 o 4 instead of Fe 3 o 4 It can solve the problem of magnetic stability, but the magnetic particles produced by this solution and activated carbon blending method grow on the outer surface of activated carbon, which cannot make full use of the high specific surface of activated carbon, and at the same time, the magnetic particles on the outer surface are easy to agglomerate, which is not conducive to practical use. application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Ultrasonic Synthesized with 15% Fe 3 o 4 magnetic activated carbon composites.

[0023] The activated carbon was soaked in 63wt% concentrated nitric acid and stirred at 70°C for 1 hour, filtered and washed with water. Weigh 5g of the above activated carbon, dissolve in 200ml, 0.5M ferric nitrate solution, and stir. Sonicate at room temperature for 15 minutes and filter. The resulting powder is washed with water once or twice and dried. Put it in a high-temperature furnace and heat it to 500°C under a nitrogen atmosphere, and keep it warm for 3 hours. That is to get ferric oxide activated carbon composite material, in which Fe 3 o 4 content of 15%, specific surface area of ​​800m 2 g -1 , after adsorbing phenol, magnetic separation was performed with a magnet.

Embodiment 2

[0025] Ultrasonic Synthesized with 30% Fe 3 o 4 magnetic activated carbon composites.

[0026] Activated carbon was soaked in 63wt% concentrated nitric acid and stirred at 80°C for 3 hours, filtered and washed with water. Weigh 5g of the above activated carbon, dissolve in 200ml, 3M ferric nitrate solution, and stir. Sonicate at room temperature for 1.5 hours and filter. The resulting powder is washed with water once or twice and dried. Put it in a high-temperature furnace and heat it to 650°C under a nitrogen atmosphere, and keep it warm for 3 hours. That is to get ferric oxide activated carbon composite material, in which Fe 3 o 4 content of 30%, specific surface area of ​​770m 2 g -1 . At 25°C, 1g of magnetic activated carbon composite can remove up to 321mg of methylene blue. The adsorption performance is much better than that of activated carbon materials with the same specific surface area. It can also be quickly detached using a magnet.

Embodiment 3

[0028] Ultrasonic Synthesized with 40% Fe 3 o 4 magnetic activated carbon composites.

[0029] Soak activated carbon in 63% concentrated nitric acid and stir at 90°C for 6 hours, filter and wash with water. Weigh 5g of the above activated carbon, dissolve in 200ml, 4M ferric nitrate solution, and stir. Sonicate at room temperature for 4 hours and filter. The resulting powder is washed with water once or twice and dried. Put it in a high-temperature furnace and heat it to 800°C under a nitrogen atmosphere, and keep it warm for 3 hours. That is to get ferric oxide activated carbon composite material, in which Fe 3 o 4 content of 50%, specific surface area of ​​650m 2 g -1 , after adsorbing copper ions, the composite material can be quickly separated from the solution using a magnet.

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Abstract

The invention provides a method for preparing a magnetic active carbon composite material for water treatment in the technical field of environmental purification. The method comprises the following steps: mixing active carbon and corresponding metal salt solution, and generating magnetic nano granules in pore canals of the active carbon in situ by using the characteristics of instantaneous high temperature, high pressure, high cooling speed and the like generated by ultrasonic waves; and filtering and drying the obtained compound, and treating the compound at high temperature to form the magnetic active carbon composite material, wherein the magnetic material accounts for 15 to 50 percent in the whole material in terms of weight percentage, and the active carbon material accounts for 85 to 50 percent. The invention provides a new method for generating magnetic nano particles in the pore canals of the active carbon; and the prepared magnetic active carbon keeps larger specific surface area, reserves the open pore canals from the active carbon, removes organic substances and inorganic heavy metal ions in water treatment, and is easy for magnetic separation and convenient to recover.

Description

technical field [0001] The invention relates to a method for preparing a composite material in the technical field of environmental purification, in particular to a method for preparing a magnetic activated carbon composite material for water treatment. Background technique [0002] Activated carbon materials refer to a class of porous materials with highly developed specific surface area and porosity. The raw materials of activated carbon can be agricultural wastes, such as wood blocks, coconut shells, rice husks, wild bamboo leaves, or synthetic materials, such as synthetic rubber, foam plastics, etc. These substances decompose and remove non-carbon substances through high-temperature carbonization, and retain a carbon body with a stable structure. This carbon body has a preliminary pore structure, and then undergoes a physical or chemical activation process to obtain a well-developed pore structure, with a specific surface area as high as 1000-3000m 2 .g -1 activated ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28
Inventor 朱申敏张荻张云鹭李文斐
Owner SHANGHAI JIAO TONG UNIV
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