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Method for preparing activated carbon from coal tar residues and application thereof

A technology for preparing activated carbon and coal tar, which is applied in the fields of chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc. It can solve the problems of unsatisfactory high-pollution water treatment, limited specific surface area and adsorption performance, and limited water purification capacity. , to achieve the effect of relatively low cost, low cost and easy operation

Inactive Publication Date: 2014-03-12
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific surface area and adsorption performance of these ordinary activated carbons are limited, resulting in limited water purification capacity, which cannot meet the treatment of highly polluted water (such as oilfield sewage and coal chemical sewage)

Method used

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  • Method for preparing activated carbon from coal tar residues and application thereof
  • Method for preparing activated carbon from coal tar residues and application thereof
  • Method for preparing activated carbon from coal tar residues and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Coal tar residue and potassium hydroxide activator are mixed evenly at a mass ratio of 1:3, then transferred to a high-temperature furnace, and reacted for 1 hour at a temperature of 800°C under the protection of an inert atmosphere of nitrogen;

[0033] Then cool, wash with 2M dilute hydrochloric acid solution until the pH value is 6-7, and dry to obtain the coal tar porous activated carbon material;

[0034] Characterization results of the physical and chemical properties of the obtained coal tar porous carbon materials using scanning electron microscopy, transmission electron microscopy, infrared, and elemental analyzers figure 1 , figure 2 ; Carry out adsorption test and supercapacitor test to the obtained coal tar porous activated carbon material, the result image 3 and Figure 4 ;

[0035] figure 1 , figure 2 and image 3 The results show that the obtained coal tar porous activated carbon material has a specific surface area of ​​3290.23m 2 g -1 , the p...

Embodiment 2

[0037] Mix the coal tar residue and zinc chloride uniformly at a mass ratio of 1:4, transfer to a high-temperature furnace, and react for 2 hours at a temperature of 500° C. under the protection of an inert atmosphere of nitrogen;

[0038] Then cool, wash with 2M dilute hydrochloric acid solution until the pH value is 6-7, and dry to obtain the coal tar porous activated carbon material;

[0039] The specific surface area of ​​coal tar porous activated carbon material obtained by nitrogen adsorption and desorption analysis and elemental analyzer detection is 1120m 2 g -1 , the pore size is mainly micro-mesopores smaller than 1-6nm; the mass percentage of elemental analysis is carbon 90.55%, oxygen 1.29%, nitrogen 7.9%, as shown in the table. The adsorption iodine value is 400mg / g, the adsorption methylene blue value is 100mg / g, and the supercapacitor test result is 130Fg -1 ;

[0040] surface

[0041]

Embodiment 3

[0043] Mix the coal tar residue and sodium hydroxide evenly with a mass ratio of 1:4, transfer to a high-temperature furnace, and react for 3 hours at a temperature of 600°C under the protection of an inert atmosphere of nitrogen;

[0044] Then cool, wash with 2M dilute nitric acid solution until the pH value is 6-7, and dry to obtain the coal tar porous activated carbon material;

[0045] The specific surface area of ​​coal tar porous activated carbon material obtained by nitrogen adsorption and desorption analysis and elemental analyzer detection is 2300m 2 g -1 , the pore size is mainly micro-mesoporous; elemental analysis mass percentage is carbon 90.3%, oxygen 4.7%, nitrogen 0.4%. The adsorption iodine value is 1300mg / g, the adsorption methylene blue value is 400mg / g, and the supercapacitor test result is 210Fg -1 .

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Abstract

The invention relates to a method for preparing activated carbon from coal tar residues and application thereof. The method comprises the following steps: mixing coal tar residues with an activator, reacting in an inert protective atmosphere, cooling, washing in an acidic solution until the pH value is 6-7, and drying to obtain a coal tar porous activated carbon material. The test indicates that the coal tar porous activated carbon material obtained by the method has the advantages of abundant pore structure, large specific area and higher adsorption capacity, the iodine adsorption value is up to 2000 mg / g, the methylene blue adsorption value is up to 400 mg / g, the coal tar porous activated carbon material can be used as an adsorbent in the fields of water purification and super capacitors, and the dye methylene blue adsorption value is up to 700 mg / g. When the coal tar porous activated carbon material is used as a super capacitor electrode material to assembly a high-performance super capacitor, the specific capacitance of the activated carbon single electrode is up to 380 Fg<-1>; and the coal tar porous activated carbon material is microporous-mesoporous composite carbon, of which the specific area is 3500 m<2>g<-1> or so, the pore size distribution is 1-5nm and the pore volume is 1.98 cm<3>g<-1> or so. The method is convenient to operate, low in energy consumption and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of high-performance activated carbon using coal tar slag as a raw material, and the application of the activated carbon as a water purifying agent and a supercapacitor electrode material. Background technique [0002] Activated carbon is a black, porous chemical. The outstanding advantages of activated carbon are developed internal pore structure, large specific surface area, excellent adsorption performance and good chemical stability (such as: acid resistance, alkali resistance, insoluble in water and organic solvents), physical stability (such as: high mechanical strength , heat resistance) and easy regeneration after use failure. It can decolorize, deodorize, desulfurize, debenzene, and selectively remove certain chemical impurities in the liquid or gas phase. It can also adsorb certain substances as a catalyst, greatly speeding up the chemical reaction, and is a good catalyst body. Therefore, since ...

Claims

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Application Information

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IPC IPC(8): C01B31/12C02F1/28H01G11/34C01B32/33C01B32/342C01B32/348
CPCY02E60/13
Inventor 殷娇王传义
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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