Preparation method of hydrophilic SiO2 aerogel

A hydrophilic and aerogel technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as cumbersome process, achieve the effects of expanding application, reducing production costs, and reducing environmental pollution

Active Publication Date: 2013-10-09
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the current methods for preparing hydrophilic aerogels at home and abroad are mainly heat treatment or surface hydrophilic modification of hydrophobic aerogels. more cumbersome

Method used

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  • Preparation method of hydrophilic SiO2 aerogel
  • Preparation method of hydrophilic SiO2 aerogel
  • Preparation method of hydrophilic SiO2 aerogel

Examples

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example 2

[0034] Mix 25ml orthomethyl silicate (TMOS) with 110ml formic acid (C 2 h 4 o 2 ) after mixing evenly, add 6ml of deionized water at room temperature, stir at a stirring rate of 100 rpm for 3 hours, and use a 35% ammonia solution (NH 3 ·H 2 O) Adjust the pH of the solution to 6.5, seal and let stand for 40 minutes to form SiO 2 wet gel. The prepared SiO 2 After the wet gel was left at room temperature for 6 hours, formic acid solution was added (C 2 h 4 o 2 ) to completely immerse the wet gel, and age at room temperature for 18 days, during which time the aging solution is changed every two days. After aging, use CO 2 In the supercritical drying method, formic acid is first selected to completely immerse the wet gel, and 10MPa of CO is introduced. 2 , at 25°C with a gas release rate of 8L / min for 6h; then raise the temperature to 70°C, and then 2 At the same time, the gas is replaced at a rate of 8L / min for 15h; finally, the CO is released at a rate of 4L / min. 2 Re...

example 3

[0037] Mix 25ml orthomethyl silicate (TMOS) with 95ml acetic acid (C 2 h 4 o 2 ) after mixing evenly, add 9ml of deionized water at room temperature and stir for 4 hours at a stirring rate of 300 rpm, and use a 45% ammonia solution (NH 3 ·H 2 O) Adjust the pH of the solution to 7, seal and let stand for 60 minutes to form SiO 2 wet gel. The prepared SiO 2 After the wet gel was left at room temperature for 10 h, acetic acid solution was added (C 2 h 4 o 2 ) to completely immerse the wet gel, and age at room temperature for 20 days, and replace the aging solution every three days. After aging, use CO 2 In the supercritical drying method, first, acetic acid is selected to completely immerse the wet gel, and 15MPa of CO is introduced. 2 , at 30°C for 2 hours at a gas release rate of 10L / min; then raise the temperature to 80°C, and then 2 Next, replace the gas at a rate of 10L / min for 10h; 2 Release to the same pressure as the outside atmosphere, turn off the power, coo...

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Abstract

The invention relates to a preparation method of a hydrophilic SiO2 aerogel. The preparation method comprises the following specific steps of: evenly mixing a silicon source, an organic acid and de-ionized water together in a fixed volume ratio and stirring; then, carrying out a sol-gel process by using ammonia water with an appropriate mass concentration; aging and preparing the SiO2 aerogel with excellent hydrophilic performance by using CO2 supercritical drying technology. The obtained aerogel has a specific surface area in the range from 650 to 800 m<2>/g, a pore volume in the range from 2.5 to 3.5 cm<3>/g, a mean pore size in the range from 35 to 60 nm and a water regaining ability in the range from 6 to 8 ml/g. The preparation method has the advantages that the SiO2 aerogel with excellent hydrophilic performance is prepared by using an acidic, hydrophilic organic acid instead of ethanol as a solvent, so that the hydrophilic performance of the aerogel is improved while excellent properties of the aerogel are maintained, simultaneously, the organic acid is closely bonded with surface hydrogels of the hydrophilic SiO2 aerogel, so that chemical adsorption can be taken during adsorption to alkaline gases (like NH3), and therefore, complete combination of physical adsorption and chemical adsorption is realized and the application range of the SiO2 aerogel in gas adsorption is expanded.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, and in particular relates to a hydrophilic SiO with excellent hydrophilic properties. 2 Airgel preparation method. Background technique [0002] SiO 2 Airgel is a new type of porous nanomaterial. Because it has a porosity of about 90% and a nano-sized pore size, it has been widely used in catalysts, heat insulation, especially adsorption and other fields. At present, most of the researches and preparations at home and abroad are hydrophobic SiO 2 Airgel, because of its good adsorption properties and hydrophobic and lipophilic properties, can be well immersed in the solution to absorb a large number of waste ions (such as Cu 2+ , Pb 2+ and Fe 3+ etc.), it was also applied to the adsorption of pollutants such as TNT, RDX and HMX in explosive wastewater. But hydrophobic SiO 2 The hydrophobic property of airgel makes it have obvious shortcomings in the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158
Inventor 崔升阮居祺沈晓冬
Owner NANJING UNIV OF TECH
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