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

Preparation method of hydrophobic SiO2 aerogel-activated carbon composite material

A composite material, activated carbon technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of difficult regeneration, high cost, short service life, etc., to achieve good hydrophobicity, good hydrophobic performance, and experimental environment is not complicated. Effect

Inactive Publication Date: 2012-11-14
NANJING UNIV OF TECH
View PDF2 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liu et al. used water glass as raw material and TMCS as modifier to prepare hydrophobic SiO with a contact angle of 138°. 2 Airgel, but the main disadvantage of airgel as an adsorbent is its high cost
[0003] Although activated carbon is cheap and easy to obtain as an adsorbent, its disadvantage is that it has a short service life and is not easy to regenerate.

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
  • Preparation method of hydrophobic SiO2 aerogel-activated carbon composite material
  • Preparation method of hydrophobic SiO2 aerogel-activated carbon composite material
  • Preparation method of hydrophobic SiO2 aerogel-activated carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] A mixed solution of 14.7ml tetramethyl orthosilicate, 7.2ml deionized water, 68ml absolute ethanol, 2.4ml phenyltriethoxysilane (PTES) and 0.3ml hydrochloric acid (1mol / L) was used as catalyst at 40°C Under heating and stirring continuously, add ammonia water after 40min to adjust the pH value to 6.5. Continue to stir for 60 minutes to cause polycondensation reaction, and add the solution to 2.5g, 5g, 10g, 15g, and 20g of activated carbon (0.77ml, 1.55ml, 3.1ml, 4.65ml, 6.2ml of activated carbon were used respectively) Hydrochloric acid cleaning, and drying), sonication and standing to form a wet gel. The wet gel was solvent-replaced with absolute ethanol every 12 hours for a total of 3 times. Finally, after drying, the hydrophobic SiO 2 Airgel-activated carbon composites.

[0024] Modifier phenyltriethoxysilane (PTES) in this example, gac addition is the N of the composite material prepared by 5g 2 Adsorption-desorption isotherm curves such as figure 1 (b) shown. ...

example 2

[0026] Heat the mixed solution of 14.7ml tetramethyl orthosilicate, 14.4ml deionized water, 93ml absolute ethanol, 4.8ml phenyltriethoxysilane (PTES) and 0.8ml acetic acid as catalyst at 50°C and keep stirring After 60 min, sodium hydroxide was added to adjust the pH value to 7. Continue to stir for 40 minutes to make polycondensation reaction occur, and add the solution to 2.5g, 5g, 10g, 15g, and 20g of activated carbon that have been weighed in advance (wherein activated carbon uses 7.7ml, 15.5ml, 31.0ml, 46.5ml, 62.0ml Hydrochloric acid cleaning, and drying), after sonication, stand to form a wet gel. The wet gel was replaced with absolute ethanol for solvent replacement every 24 hours for a total of 5 times. Finally, after drying, the hydrophobic SiO 2 Airgel-activated carbon composites.

example 3

[0028] A mixed solution of 14.7ml of tetramethyl orthosilicate, 7.2ml of deionized water, 68ml of absolute ethanol, 6ml of methyltriethoxysilane (MTES) and 0.5ml (1mol / L) of hydrochloric acid as a catalyst was at 60°C Heating and stirring continuously, after 60 min, potassium hydroxide was added to adjust the pH value to 7.5. Continue to stir for 60min to make it undergo polycondensation reaction, add the solution to be weighed in advance and be respectively in 2.5g, 5g, 10g, 15g, 20g gac (wherein gac is cleaned with hydrochloric acid of 68ml, 135ml, 270ml, 405ml, 540ml respectively, and drying), and left to form a wet gel after ultrasonication. The wet gel was replaced with absolute ethanol for solvent replacement every 12 hours for a total of 8 times. Finally, after drying, the hydrophobic SiO 2 Airgel-activated carbon composites.

[0029] Modifier methyltriethoxysilane (MTES) and gac addition in this example are the N of the composite material prepared by 5g 2 Adsorptio...

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
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of preparation techniques of aerogel materials, and relates to a preparation method of a hydrophobic SiO2 aerogel-activated carbon composite material. The preparation method comprises the following steps: by using a silicon source as a reactant, water as a hydrolytic agent, anhydrous alcohol as a solvent and acid as a catalyst, adding a hydrophobic modifier to carry out hydrolysis at 40-60 DEG C while keeping stirring; after completely finishing hydrolysis, adding alkali to regulate the pH value, continuing stirring to initiate polycondensation reaction, adding the solution into previously weighed activated carbon, and applying ultrasonic to form a wet gel; replacing the solvent water of the wet gel with the anhydrous alcohol; and finally, drying to obtain the hydrophobic aerogel-activated carbon composite material. The aerogel composite material prepared by the method provided by the invention solves the problems of high price of aerogel and short service life of activated carbon.

Description

technical field [0001] The invention belongs to the field of preparation technology of airgel materials, and in particular relates to a kind of hydrophobic SiO compounded with activated carbon and combined with a two-step sol-gel method and drying process. 2 Preparation method of airgel-activated carbon composite material. Background technique [0002] Airgel is a typical nanoporous material, SiO 2 The specific surface area is high, the porosity is large, and its surface polarity is controllable, and its hydrophilicity and hydrophobicity can be adjusted according to needs. SiO 2 Airgel is a novel lightweight nanoporous amorphous solid-state material with controllable structure and low density (minimum 0.02 g / cm 3 ), high specific surface area (up to 1000m 2 / g) and high porosity (up to 99%). It can be used as heat insulation material, sound insulation material, filter material and adsorption material, etc. Liu et al. used water glass as raw material and TMCS as modifie...

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 Applications(China)
IPC IPC(8): B01J20/20B01J20/30
Inventor 崔升周小芳沈晓冬吴战武
Owner NANJING UNIV OF TECH
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