Preparation method of metal carbon material capable of absorbing and reducing refractory pollutants

A technology of pollutants and carbon materials, which is applied in the field of water treatment, can solve the problems affecting the treatment effect and service life, the material is prone to compaction and passivation, and the specific surface area of ​​metal shavings is small, so as to achieve more effective active sites and reduce the production cost. Difficulty, the effect of small electron transfer resistance

Inactive Publication Date: 2010-12-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the widely used zero-valent metal is Fe scrap material. The metal carbon material is prepared by simply mixing Fe scrap, carbonaceous materials and metal scrap. The metal scrap is Cu scrap or Ni scrap. The metal carbon material obtained by this preparation method is between The contact surface is small, the interface contact resistance is large, and the resistance of electron transfer is large, which is not conducive to the electric reduction and reduces the reduction effect. In addition, this macroscopic mixed preparation method often leads to the enrichment of pollutants on the surface of carbon materials. However, the concentration on the surface of Fe is small, and it is difficult to achieve the promotion of reduction by

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The preparation method of the metal carbon material for adsorption and reduction of refractory pollutants in this embodiment, the steps are as follows:

[0015] Step 1: Weigh 50% of Fe powder, 30% of charcoal powder and 20% of coal tar according to mass percentage and mix uniformly to become a mixed material. The particle size of the Fe powder is 250 mesh, and the charcoal powder The particle size is 250 mesh;

[0016] Step 2: Dry the mixed material for 12 hours, extrude it according to the preset shape on the extruder, and mix it with N at a concentration of 99.999%. 2 Carry out carbonization in a muffle furnace under protection, the carbonization temperature is controlled at 400°C, and the carbonization time is 1h, and then it is placed in CO with a concentration of 99.999%. 2 Activation is carried out under gas, the activation temperature is controlled at 500°C, and the activation time is 1h. After activation, it is naturally cooled to room temperature, and the mixe...

Embodiment 2

[0019] The preparation method of the metal carbon material for adsorption and reduction of refractory pollutants in this embodiment, the steps are as follows:

[0020] Step 1: Take by weighing 80% of Fe powder, 10% of coal powder and 10% of a mixture containing polyvinyl alcohol, coal tar and asphalt according to mass percentage and mix uniformly to become a mixed material. The particle size of the Fe powder is 250 mesh, the particle size of the pulverized coal is 250 mesh, and the mass ratio of the polyvinyl alcohol, coal tar and pitch is 3:3:4;

[0021] Step 2: Dry the mixed material for 12 hours, extrude it according to the preset shape on the extruder, and mix it with N at a concentration of 95%. 2 Carry out carbonization in a muffle furnace under protection, the carbonization temperature is controlled at 450 ° C, and the carbonization time is 2 hours, and then it is placed in 95% CO 2 Activation is carried out under gas, the activation temperature is controlled at 900°C,...

Embodiment 3

[0024] The preparation method of the metal carbon material for adsorption and reduction of refractory pollutants in this embodiment, the steps are as follows:

[0025] Step 1: Take by weighing 60% of Fe powder, 25% of pine powder and 15% of the mixture containing polyvinyl alcohol, coal tar and asphalt according to mass percentage and mix uniformly to become a mixed material. The particle size of the Fe powder is 250 mesh, the particle size of described pine wood powder is 300 mesh, the mass ratio of described polyvinyl alcohol, coal tar and asphalt is 4: 3: 2;

[0026] Step 2: Dry the mixed material for 12 hours, extrude it according to the preset shape on the extruder, and mix it with N at a concentration of 95%. 2 Carbonization was carried out in a muffle furnace under protection, the carbonization temperature was controlled at 500°C, and the carbonization time was 3h, and then it was placed in 95% CO 2 Activation is carried out under gas, the activation temperature is con...

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Abstract

The invention discloses a preparation method of a metal carbon material capable of absorbing and reducing refractory pollutants, which comprises the steps of: uniformly mixing metal micro powder containing Fe powder, a carbonic material and a binder in proportion and drying, then extruding on an extruding machine for molding, carrying out carbonization and activating treatments in a muffle, and naturally cooling to a room temperature to prepare the metal carbon material capable of absorbing and reducing the refractory pollutants. The metal carbon material prepared by the method is mainly applicable to the treatment of refractory halogenated pollutants in sewage, has the reduction and dechlorination effects on the refractory pollutants over 4 times better than that of simple metal micro powder mixture containing the Fe powder in the same proportion and weight under the same treatment conditions, has the advantages of large specific surface area, good reduction activity and low preparation and treatment cost, and in addition, is not easy to harden and passivate, thereby prolonging the service life.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation method of a metal carbon material for absorbing and reducing refractory pollutants. Background technique [0002] With the rapid development of the economy, a large amount of refractory pollutant wastewater is produced in production and life, especially halogenated pollutants, which are widely used in chemical, pharmaceutical, pesticide, leather, machinery, wood preservation and other industries. , container leakage, waste water discharge, and burning into the environment, seriously polluting the atmosphere, soil, groundwater, and surface water. In addition, the method of using chlorine as a disinfectant for drinking water that is widely used in my country will also produce toxic chlorine-containing organic compounds Such as chloroform, chloroalkene, chlorophenol, aldehyde and ketone chloride, etc. Many organic chlorides are considered to have "carcinogenic, ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01J23/745B01J23/755B01J23/72C02F1/28C02F1/70C02F101/12
Inventor 邓述波徐夫元徐杰吴敏余刚黄俊
Owner TSINGHUA UNIV
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