A Microwave Heating Modification Method for Enhancing Basic Groups on the Surface of Activated Carbon

A technology of microwave heating and surface alkalinity, applied in chemical instruments and methods, other chemical processes, etc., to achieve the effect of expanding the scope of application, low price, and enhancing surface alkalinity

Inactive Publication Date: 2016-08-24
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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  • A Microwave Heating Modification Method for Enhancing Basic Groups on the Surface of Activated Carbon
  • A Microwave Heating Modification Method for Enhancing Basic Groups on the Surface of Activated 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 / LNaOH, and then distilled water until the filtrate pH=7, and dried in an oven at 110°C for 12h to obtain activated carbons prepared in two modified ways. 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, respe...

Embodiment 2

[0025] Weigh and mix uniformly raw coal-based activated carbon and ammonia modified (10% ammonia concentration, treatment time 12h, treatment temperature 35 ℃) treated activated carbon 3.0g, placed in a quartz tube and installed on the refitted microwave reactor , at N 2Under 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 / LNaOH, and then distilled water until the filtrate pH=7, and dried in an oven at 110°C for 12h to obtain activated carbons prepared in two modified ways. 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, respectively. g, pH ...

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 / LNaOH, and then washed with distilled water until the filtrate pH=7, and dried in an oven at 110°C for 12 hours to obtain the activated carbon prepared in two modified ways . 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 0.43mm...

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Abstract

The invention relates to a method for direct microwave heating modification and microwave heating synergistic ammoniation modification for enhancing basic groups on the surface of activated carbon. The main steps of the modification: a certain amount of coal-based activated carbon or ammoniated coal-based activated carbon, in N 2 Under protection, the modified active carbon is obtained by heating under the condition of microwave power of 300-900W, microwave radiation time of 8-20min, washing and drying with water. Tests show that the surface basic group content of the modified activated carbon prepared in different examples increases from 0.079mmol / g to 0.58mmol / g, the surface acid group content decreases from 1.57mmol / g to 0.30mmol / g, and the pH pzc The value increased from 6.83 to 7.97. The method of the present invention can significantly increase the content of basic groups on the surface of the modified activated carbon by microwave heating, thereby increasing the basic characteristics of the surface of the activated carbon, which is beneficial to the adsorption and removal of acidic organic pollutants and non-polar or weak polarity in the liquid phase Pollutants have the advantages of simple operation, easy control, energy saving, high efficiency, and low cost, and can be widely used in 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 Patents(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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