Microwave heating modifying method capable of enhancing basic groups on surface of active carbon

A technology of microwave heating and surface alkalinity, which is applied in the direction of chemical instruments and methods, and other chemical processes, to achieve the effects of energy saving, simple operation process, and short preparation time

Inactive Publication Date: 2014-09-03
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the modification of basic functional groups on the surface of activated carbon by synergistic ammonification under microwave radiation heating, and this modification technology has significant innovation and application value

Method used

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  • Microwave heating modifying method capable of enhancing basic groups on surface of active carbon
  • Microwave heating modifying method capable of enhancing basic groups on surface of active carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh and mix uniformly raw coal-based activated carbon and ammonia modified (10% ammonia concentration, treatment time 12h, treatment temperature 35 ℃) treatment activated carbon respectively 3.0g, placed in a quartz tube and installed on the refitted microwave reactor , at N 2 Under protection, set the microwave time to 15min, and the microwave power to 300W for microwave heating modification. After the modification reaction was finished and cooled, the samples prepared by microwave modification were MCAC300 and NCAC300, respectively. Then, the prepared modified sample was washed with 0.1mol / L HCl and 0.1mol / L NaOH, and then distilled water until the filtrate pH=7, and then dried in an oven at 110°C for 12 hours to obtain the two modified activated carbons . The surface basic groups of the modified activated carbons MCAC300 and NCAC300 prepared under the two conditions were 0.19mmol / g and 0.22mmol / g, and the surface acidic groups were 1.08mmol / g and 0.59mmol / g, resp...

Embodiment 2

[0025] Weigh and mix uniformly raw coal-based activated carbon and ammonia modified (10% ammonia concentration, treatment time 12h, treatment temperature 35 ℃) treatment activated carbon respectively 3.0g, placed in a quartz tube and installed on the refitted microwave reactor , at N2 Under protection, set the microwave time to 15min, and the microwave power to 500W for microwave heating modification. After the modification reaction was finished and cooled, the samples prepared by microwave modification were MCAC500 and NCAC500, respectively. Then, the prepared modified sample was washed with 0.1mol / L HCl and 0.1mol / L NaOH, and then distilled water until the filtrate pH=7, and then dried in an oven at 110°C for 12 hours to obtain the two modified activated carbons . The surface basic groups of the modified activated carbons MCAC500 and NCAC500 prepared under the two conditions were 0.40mmol / g and 0.45mmol / g, and the surface acidic groups were 0.64mmol / g and 0.39mmol / g, respec...

Embodiment 3

[0027] Weigh and mix uniformly raw coal-based activated carbon and ammonia modified (10% ammonia concentration, treatment time 12h, modification temperature 35°C) treated activated carbon 3.0g, respectively, placed in a quartz tube and installed in the modified microwave reactor on, at N 2 Under protection, set the microwave time to 10min, and the microwave power to 700W for microwave heating modification. After the modification reaction was completed and cooled, the samples prepared by microwave modification were MCAC700 and NCAC700 respectively. Then the prepared modified sample was washed with 0.1mol / L HCl and 0.1mol / L NaOH, then distilled water until the filtrate pH=7, and dried in an oven at 110°C for 12 hours to obtain the prepared two modified samples. Activated carbon. The surface basic groups of the modified activated carbons MCAC700 and NCAC700 prepared under the two conditions were 0.52mmol / g and 0.58mmol / g, and the surface acidic groups were 0.43mmol / g and 0.30mm...

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Abstract

The invention relates to a direct microwave heating modifying and microwave heating and ammonification cooperated modifying method capable of enhancing basic groups on the surface of active carbon. The modifying method mainly comprises the following steps: heating a defined amount of coal-based active carbon or ammonified coal-based active carbon under the protection of N2 and under the condition that microwave power is 300-900 W, modifying with microwave radiation time of 8-20 min, and washing and drying to obtain modified active carbon. Tests indicate that the content of the basic groups on the surface of modified active carbon prepared in different embodiments are increased from 0.079 mmol/g to 0.58 mmol/g, the content of acidic groups on the surface of modified active carbon are reduced from 1.57 mmol/g to 0.30 mmol/g, and the pH<pzc> value is increased from 6.83 to 7.97. According to the modifying method, the content of the basic groups on the surface of modified active carbon can be remarkably increased through a microwave heating method, so that the basic characteristic of the surface of active carbon is enhanced, and acid organic pollutants and nonpolar or weakly polar pollutants in a liquid phase are favorably adsorbed. The modifying method has the advantages of simplicity in operation, convenience in control, energy conservation, high efficiency, low cost and the like, and can be widely applied to the treatment of pollutants.

Description

technical field [0001] The invention relates to a method for modifying activated carbon, in particular to a method for modifying activated carbon which strengthens basic groups on the surface of activated carbon under the condition of microwave irradiation heating. Background technique [0002] Activated carbon is a carbonaceous adsorption material with rich pore structure and huge specific surface area. It has the characteristics of strong adsorption capacity, good chemical stability, high mechanical strength and renewability. It is widely used in chemical industry, medicine and health, food processing It is an indispensable product for national economy, national defense construction and people's daily life. Activated carbon is used as an adsorption material to treat wastewater with low cost and good effect, and is deeply valued by people. However, due to the backward production technology, most of the coal-based activated carbon products currently produced in my country h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30
Inventor 武占省葛欣宇童延斌闫豫君
Owner SHIHEZI UNIVERSITY
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