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Preparing method of Gamma-ureidopropyl modified aerogel

A technology of ureapropyl and aerogels, which is applied in the field of preparation of low-cost modified aerogels, can solve the problem of low adsorption capacity, and achieve the effect of high specific surface area and high adsorption capacity

Active Publication Date: 2014-08-27
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the current patent reports, the adsorption capacity of the existing airgel adsorbents for heavy metal ions is not high, and the adsorption capacity of the adsorbents for Cu 2+

Method used

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  • Preparing method of Gamma-ureidopropyl modified aerogel
  • Preparing method of Gamma-ureidopropyl modified aerogel
  • Preparing method of Gamma-ureidopropyl modified aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Prepare a water glass solution according to the mass ratio of potassium water glass to water as 1:1, pour it into an ion exchange column to obtain a silica sol with a pH value of 2, add an appropriate amount of NaOH catalyst, adjust the pH value to 5.5, let it stand, gel. After 4 hours of gelation, add Gamma-ureapropyl triethoxysilane to anhydrous methanol with a volume ratio of 1:1 to modify the solution, the volume of the modified solution is 5 times the volume of the gel, and the modification time is 2 days , the modification temperature is 65 ℃, after the modification, the solution is replaced with anhydrous methanol solution, the temperature is 65 ℃, until the pH value is 6. use C0 2 Supercritical Drying of Gamma-Ureapropyl Modified SiO 2 The gel dries. When dry, C0 2 The pressure was controlled at 8MPa, the temperature was controlled at 45°C, and the supercritical drying time was 48h to obtain a Gamma-ureapropyl modified aerogel product. figure 1 It can be se...

Embodiment 2

[0025] The water glass solution was prepared according to the mass ratio of sodium water glass and water to 1:5, poured into the ion exchange column to obtain a silica sol with a pH value of 3, an appropriate amount of ammonia water catalyst was added, the pH value was adjusted to 6.5, and it was allowed to stand for condensation. glue. After gelling for 1 hour, add Gamma-ureapropyltrimethoxysilane to absolute ethanol and water in a ratio of 1:10:0.3 to modify the solution, the volume of which is 1 times the volume of the gel, and the modification time is 10 days. The modification temperature is 25°C, after the modification, the solution is replaced with anhydrous ethanol solution, and the temperature is 25°C until the pH value is 7. use C0 2 Supercritical Drying of Gamma-Ureapropyl Modified SiO 2 The gel dries. When dry, C0 2 The pressure was controlled at 12MPa, the temperature was controlled at 50°C, and the supercritical drying time was 72h to obtain a Gamma-ureapropyl...

Embodiment 3

[0027] The water glass solution was prepared according to the mass ratio of sodium water glass and water as 1:4, poured into the ion exchange column to obtain a silica sol with a pH value of 2.5, and an appropriate amount of ammonia water catalyst was added to adjust the pH value to 6. glue. After 3 hours of gelation, add Gamma-ureapropyl triethoxysilane to anhydrous ethanol and water in a ratio of 1:3:0.1 to modify the solution, the volume of which is 1 times the volume of the gel, and the modification time is 5 days , the modification temperature is 45 ℃, after the modification, the solution is replaced with anhydrous ethanol solution, the temperature is 45 ℃, until the pH value is 6. Gamma-ureapropyl-modified SiO using ethanol supercritical drying 2 The gel dries. When drying, the pressure is controlled at 9MPa, the temperature is controlled at 250°C, and the holding time is 2h to obtain a Gamma-ureapropyl modified aerogel product. The prepared Gamma-ureapropyl modified S...

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Abstract

The invention relates to a preparing method of Gamma-ureidopropyl modified aerogel. The preparing method comprises the following steps that: firstly, SiO2 wet gel is prepared; then, a Gamma-ureidopropyl modified solution is prepared; the SiO2 wet gel is added into the prepared Gamma-ureidopropyl silane modified solution within 1 to 4 hours after the gel point, and the temperature is controlled for modification; next, solvent replacement is carried out; Gamma-ureidopropyl modified SiO2 wet gel is obtained; and then, the Gamma-ureidopropyl modified SiO2 wet gel is subjected to supercritical drying, and the Gamma-ureidopropyl modified SiO2 aerogel materials are obtained. The preparing method has the advantages that water glass at a low price is used as raw materials, in addition, heating is not needed, and only the uniform stirring is needed; and the prepared Gamma-ureidopropyl modified SiO2 aerogel has the nanoscale pore diameter, is porous, and has high specific surface area and higher adsorption quantity on Cu<2+>, Ni<2+> and Cr<3+>.

Description

technical field [0001] The invention relates to the preparation of a low-cost modified aerogel, in particular to a low-cost preparation method of a Gamma-ureapropyl modified aerogel. Background technique [0002] SiO 2 Aerogel is a novel structurally controllable porous material with high specific surface area (up to 1000 m 2 / g), high porosity (up to more than 90%), low density (minimum up to 0.02g / cm 3 ) and other characteristics, it has been widely used in many research fields. Due to SiO 2 The main preparation of aerogel comes from silicon-based raw materials such as tetramethyl orthosilicate or tetraethyl orthosilicate, such as amine-modified gas SiO. 2 Gel and its application (application number 201010503498.5), wherein the main source of silicon is tetraethyl orthosilicate, and the cost of preparing gel is relatively high. The current patent reports that the adsorption capacity of the existing aerogel adsorbents for adsorbing heavy metal ions is not high, and the...

Claims

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Application Information

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IPC IPC(8): C01B33/16
Inventor 崔升吴兰兰沈晓冬
Owner NANJING UNIV OF TECH
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