Composite absorption filtering material contg. porous aerogel, and its prepn. method

A technology of porous airgel and composite adsorption, applied in the direction of filtration separation, separation methods, chemical instruments and methods, etc., can solve the problems that have not been mentioned in the preparation and compounding of airgel, and achieve low mechanical strength and uniform distribution , saving process and trouble effect

Inactive Publication Date: 2006-11-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The airgel in Chinese patent 8805195.8 "Airgel as Adsorbent Application" is used as an adsorbent from liquid phase adsorption, but only in the aspect of liquid phase adsorption ap

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix 100ml of tetraethyl orthosilicate, 1500ml of absolute ethanol, 60ml of distilled water and 2ml of HF evenly, stir for 0.5hr, and store it statically for 10hr to obtain SiO 2 wet gel. SiO 2 The wet gel is crushed and soaked in a mixed solution of trimethylchlorosilane and n-hexane with a volume ratio of 1:8, soaked at room temperature for surface modification, and put in lignocellulose together. SiO 2 The mass ratio of the porous airgel is 1:10. Take it out after 24 hours, put it in an oven and heat it to 200°C for heat treatment after the surface is dry, and you can get 2 Organic fibers of porous airgel, that is, composite adsorption filter materials containing porous airgel.

[0018] As detected by ASAP-2000 physical adsorption instrument, the airgel porosity in the material is 92%, the pore size is 20nm, and the bulk density is 120kg / m 3 , specific surface area 800m 2 / g. The airgel composite adsorption filter material can be used for adsorption of carbon te...

Embodiment 2

[0020] Mix 100ml of tetraethyl orthosilicate, 1000ml of absolute ethanol, 100ml of distilled water and 10ml of HF evenly, stir for 2 hours, and store it statically for 1 hour to obtain SiO 2 wet gel. SiO 2 The wet gel is smashed and soaked in a mixed solution of trimethylchlorosilane and n-hexane with a volume ratio of 1:15, soaked at room temperature for surface modification, and calcium silicate slurry, rutile titanium dioxide, ceramic fiber , glass fiber, porous cement, the addition amount is the same as that of SiO 2 The mass ratio of the wet gel is 10:5:1:1:0.5:100. Take it out after 30 hours. After the surface is dry, put it in an oven and heat it to 100°C for heat treatment, and then press it into a block to obtain a hydrophobic type. Silica airgel composite bulk.

[0021] As detected by ASAP-2000 physical adsorption instrument, the airgel porosity in the material is 90%, the pore size is about 10nm, and the volume density is 150kg / m 3 , specific surface area 600m ...

Embodiment 3

[0023] Mix 100ml of ethyl orthosilicate, 300ml of absolute ethanol, 50ml of distilled water and 6ml of HF evenly, stir for 5hr, and store it statically for 3 hours to obtain SiO 2 wet gel. SiO 2 The wet gel is smashed and soaked in a mixed solution of trimethylchlorosilane and n-hexane with a volume ratio of 1:5, soaked at room temperature for surface modification, and ceramic fibers are also added at the same time, the total amount of which is the same as that of SiO 2 The mass ratio of the wet gel is 10:1. Take it out after 18 hours. After the surface is dry, put it in an oven and heat it to 150°C for heat treatment, and then press it into a block to obtain a hydrophobic composite adsorption filter with porous airgel. Material.

[0024] As detected by ASAP-2000 physical adsorption instrument, the airgel porosity in the material is 80%, the pore size is about 5nm, and the volume density is 200kg / m 3 , specific surface area 600m 2 / g. The airgel composite adsorption filte...

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Abstract

A composite adsorptive filter material containing porous aerogel is prepared through proportionally mixing ethyl n-silicate, alcohol, water and HF, stirring, laying aside to obtain wet SiO2 gel, immersing the wet SiO2 gel and fibers or fabric in the solution mixture of trimethyl chlorosilane and n-hexane for modifying, and heat treating at 100-200 deg.C.

Description

technical field [0001] The invention relates to the field of composite adsorption filter material and its preparation method, in particular to the field of composite adsorption filter material containing porous airgel and its preparation method. Background technique [0002] SiO 2 Airgel is a porous material with high specific surface area and low density. Due to the existence of the nano-network structure, this material itself has special properties, and has broad application prospects in many fields such as optics, electricity, acoustics, environmental protection, metallurgy, etc. Hot science and technology. There are also many people in our country who are doing research in this area. SiO 2 Nanoporous airgel has a high specific surface area and void ratio, and is a light-weight and highly efficient adsorption filter material, but it is not used much in practice, mainly because the mechanical strength of the airgel is not enough and the molding is difficult, thus hinde...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01D39/02
Inventor 倪星元张志华沈军周斌吴广明吴越华
Owner TONGJI UNIV
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