Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for composite hydrophobic coating on activated carbon surface

A technology of hydrophobic coating and surface compounding, which is applied in the direction of 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: 2022-05-13
ZHEJIANG UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for composite hydrophobic coating on activated carbon surface
  • A method for composite hydrophobic coating on activated carbon surface
  • A method for composite hydrophobic coating on activated carbon surface

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
adsorption capacityaaaaaaaaaa
adsorption capacityaaaaaaaaaa
Login to View More

Abstract

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. The specific steps are as follows: (1) Preparation of modified solution: (2) Immerse activated carbon in the above-mentioned modified solution, add ammonia water to adjust the pH to 7, stir magnetically at room temperature for 5 minutes and then let it stand for 24 hours; (3) Immerse the above sample in In n-hexane, after standing at room temperature for 6 hours, replace the n-hexane, repeat 3 times and then filter; (4) Soak the above-filtered sample in the n-hexane solution of trimethylchlorosilane, let it stand at room temperature for 24 hours, and filter with suction until apparent dryness; (5) place the above-mentioned suction-filtered sample in an electric blast drying oven, and dry at 60°C, 90°C, and 120°C for 2 hours each to obtain hydrophobic activated carbon. The preparation method of the invention has simple process and mild reaction conditions; the hydrophobicity of the modified activated carbon is enhanced, which overcomes the disadvantage of the decreased pollutant adsorption capacity of the activated carbon under high humidity conditions, and realizes the directional adsorption of organic waste gas.

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 treatment of organic waste gas (VOCs) in industry, but the 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 be reduced. 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 / reduc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com