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Method for compounding hydrophobic coating on surface of activated carbon

A technology of surface compounding and hydrophobic coating, which is applied in separation methods, chemical instruments and methods, carbon compounds, etc., can solve the problems of high energy consumption and degradation of activated carbon regeneration performance, and achieve simple process, enhanced hydrophobicity, and mild reaction conditions Effect

Active Publication Date: 2021-02-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the modification methods of activated carbon are mainly oxidation / reduction modification, load modification and heat treatment modification. Oxidation / reduction modification and load modification often use acid, alkali, and metal compound aqueous solution to treat activated carbon, which can enhance the surface chemical activity. Improve the adsorption of target pollutants, but it enhances the chemical adsorption capacity, and the regeneration performance of activated carbon decreases after modification
Heat treatment modification can greatly expand the pore structure of activated carbon, but the temperature often reaches above 500°C, which consumes a lot of energy

Method used

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  • Method for compounding hydrophobic coating on surface of activated carbon
  • Method for compounding hydrophobic coating on surface of activated carbon
  • Method for compounding hydrophobic coating on surface of activated carbon

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Weigh 3g of activated carbon, dip it into 10mL of a mixture of tetraethyl orthosilicate, ethanol, and water with a molar ratio of 1:50:3 at a pH of 1.5, and let it stand at room temperature for 12 hours. Stand at room temperature for 24 hours, add 20mL of n-hexane and let stand for 6h, then filter, replace with new 20mL of n-hexane and let stand for 6h, repeat the replacement 3 times, then filter, immerse in n-hexane solution with a mass concentration of 20% trimethylchlorosilane at room temperature Stand still for 24 hours, filter until apparent dryness, and dry in a blast drying oven at 60°C, 90°C, and 120°C for 2 hours each to obtain hydrophobic activated carbon AC-SiO 2 -20% TMCS.

[0024] 0.1g AC-SiO 2 -20% TMCS is placed in the adsorption tube, and the gas phase toluene concentration is 400ppm, the temperature is 30°C, and the relative humidity is 60% of the simulated polluted airflow with a flow rate of 200mL / min. The breakthrough time (outlet concentration reac...

Embodiment 2

[0026] Weigh 3g of activated carbon, dip it into 10mL of a mixture of tetraethyl orthosilicate, ethanol, and water with a molar ratio of 1:50:3 at a pH of 1.5, and let it stand at room temperature for 12 hours. Stand at room temperature for 24 hours, add 20mL of n-hexane and let stand for 6h, then filter, replace with new 20mL of n-hexane and let stand for 6h, repeat the replacement 3 times, then filter, immerse in n-hexane solution with a mass concentration of 30% trimethylchlorosilane at room temperature Stand still for 24 hours, filter until apparent dryness, and dry in a blast drying oven at 60°C, 90°C, and 120°C for 2 hours each to obtain hydrophobic activated carbon AC-SiO 2 -30% TMCS.

[0027] 0.1g AC-SiO 2 -30% TMCS is placed in the adsorption tube, and the gas phase toluene concentration is 400ppm, the temperature is 30°C, and the relative humidity is 60% of the simulated polluted airflow with a flow rate of 200mL / min. The breakthrough time (the outlet concentration ...

Embodiment 3

[0029] Weigh 3g of activated carbon, dip it into 10mL of a mixture of tetraethyl orthosilicate, ethanol, and water with a molar ratio of 1:50:3 at a pH of 1.5, and let it stand at room temperature for 12 hours. Stand at room temperature for 24 hours, add 20mL of n-hexane and let stand for 6h, then filter, replace with new 20mL of n-hexane and let stand for 6h, repeat the replacement 3 times, then filter, immerse in n-hexane solution with a mass concentration of 50% trimethylchlorosilane at room temperature Stand still for 24 hours, filter until apparent dryness, and dry in a blast drying oven at 60°C, 90°C, and 120°C for 2 hours each to obtain hydrophobic activated carbon AC-SiO 2 -50% TMCS.

[0030] 0.1g AC-SiO 2 -50% TMCS is placed in the adsorption tube, and the gas phase toluene concentration is 400ppm, the temperature is 30°C, and the relative humidity is 60% of the simulated polluted airflow with a flow rate of 200mL / min. The breakthrough time (outlet concentration reac...

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Abstract

The invention belongs to an activated carbon modification technology, and particularly relates to a method for compounding a hydrophobic coating on the surface of activated carbon. The method comprises the following specific steps of: (1) preparing a modification liquid; (2) dipping activated carbon into the modification liquid, adding ammonia water to adjust the pH value to 7, magnetically stirring for 5 minutes at room temperature, and standing for 24 hours; (3) soaking the sample in n-hexane, standing at room temperature for 6 hours, replacing n-hexane, repeating for three times, and filtering; (4) soaking the filtered sample in a n-hexane solution of trimethylchlorosilane, standing for 24 hours at room temperature, and performing suction filtration until the appearance is dry; and (5)putting the sample subjected to suction filtration into an electrothermal blow-drying box, and respectively drying at 60 DEG C, 90 DEG C and 120 DEG C for 2 hours to obtain the hydrophobic activated carbon. The preparation method is simple in process and mild in reaction condition; and the hydrophobicity of the modified activated carbon is enhanced, the defect that the pollutant adsorption capacity of the activated carbon is reduced under the high-humidity working condition is overcome, and directional adsorption of organic waste gas is achieved.

Description

technical field [0001] The invention belongs to activated carbon modification technology, and in particular relates to a method for compounding a hydrophobic coating on the surface of activated carbon. Background technique [0002] The activated carbon adsorption method is widely used in the purification of organic waste gas (VOCs) in industry, but organic waste gas often carries a large amount of water vapor. Activated carbon will easily absorb water vapor under high humidity conditions, and the adsorption performance of VOCs will decrease. If the surface of activated carbon is hydrophobically modified, it can reduce the adsorption of water vapor, thereby improving the adsorption capacity of activated carbon to target pollutants and improving the utilization rate of activated carbon. [0003] At present, the modification methods of activated carbon are mainly oxidation / reduction modification, load modification and heat treatment modification. Oxidation / reduction modificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C01B32/354B01D53/02
CPCB01J20/20C01B32/354B01D53/02B01D2257/708
Inventor 金余其陈彤李智锐孙晨唐烽蔡杰马家瑜戴斌李晓东严建华
Owner ZHEJIANG UNIV
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