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Preparation method of transparent hydrophobic spherical silica aerogel adsorbent

A spherical silica, silica sol technology, applied in chemical instruments and methods, separation methods, alkali metal oxides/hydroxides, etc., can solve the problems of poor recycling ability, weak adsorption selectivity, poor mechanical properties, etc. , to achieve the effect of high safety, low cost and simple preparation method

Pending Publication Date: 2022-05-27
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the problems of low adsorption rate, weak adsorption selectivity, poor recycling ability and poor mechanical properties of existing airgel adsorption materials, the present invention provides a preparation method of transparent hydrophobic spherical silica airgel adsorbent

Method used

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  • Preparation method of transparent hydrophobic spherical silica aerogel adsorbent
  • Preparation method of transparent hydrophobic spherical silica aerogel adsorbent
  • Preparation method of transparent hydrophobic spherical silica aerogel adsorbent

Examples

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example 1

[0028] Under the condition of high shear stirring at a speed of 20000rpm, 20mol of acetic acid aqueous solution with a concentration of 1mM, 0.016mol of sodium dodecylbenzenesulfonate and 0.2mol of pyridine were mixed uniformly, and 1mol of methyltrimethoxysilane was mixed with The above mixed solution was dropped at a rate of 10 mL / min, continued stirring to obtain a homogeneous emulsion, and was allowed to stand for defoaming to obtain a clear and transparent silica sol. The sol was preheated at 90 °C for 5 min, and dropped into paraffin at 65 °C using an automatic ball dropper with an inner diameter of 3 mm, and allowed to stand for 5 min for gelation reaction to obtain spherical silica wet gel. The wet gel was washed three times with deionized water at 70 °C for 6 h each time, and then replaced with methanol at 50 °C for three times for 10 h each time to obtain spherical siloxane gel. Mix 100 ml of ethylenediamine and 100 ml of ethanol to obtain a modified liquid. At 60 °...

example 2

[0033] Under the condition of high-speed shear stirring at a speed of 18000rpm, 10mol of oxalic acid aqueous solution with a concentration of 5mM, 0.016mol of cetyltrimethylammonium bromide and 0.1mol of urea were mixed uniformly, and 1mol of methyltriethoxy Silane was added dropwise to the above mixed solution at a rate of 6 mL / min, continued stirring to obtain a homogeneous emulsion, which was allowed to stand for defoaming to obtain a clear and transparent silica sol. The sol was preheated at 80 °C for 10 min, and dropped into n-hexane at 20 °C using an automatic ball dropper with an inner diameter of 1 mm, and allowed to stand for 10 min for gelation reaction to obtain spherical silica wet gel. The wet gel was washed 5 times with deionized water at 20 °C for 12 h each time, and then replaced with ethanol at 20 °C for 5 times for 12 h each time to obtain spherical siloxane gel. 100 ml of hexamethylenediamine and 200 ml of acetonitrile were mixed to obtain a modified liquid....

example 3

[0035] Under the condition of high-speed shear stirring at a speed of 15000rpm, 30mol of 0.1mM aqueous carbonate solution, 0.032mol of cetyltrimethylammonium chloride and 0.8mol of ammonium bicarbonate were mixed uniformly, and 1mol of dimethyl ammonium chloride was mixed. Dimethoxysilane was dropped into the above mixed solution at a rate of 4.5 mL / min, continued stirring to obtain a homogeneous emulsion, which was allowed to stand for defoaming to obtain a clear and transparent silica sol. The sol was pre-heated at 70 °C for 15 min, and dropped into corn oil at 80 °C using an automatic ball dropper with an inner diameter of 5 mm, and allowed to stand for 3 min for gelation reaction to obtain spherical silica wet gel. The wet gel was washed three times with deionized water at 80 °C for 4 h each time, and then replaced with acetonitrile at 60 °C for four times for 9 h each time to obtain spherical siloxane gel. 100 ml of 3-aminopropyltriethoxysilane and 500 ml of isopropanol w...

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Abstract

The invention relates to a preparation method of a transparent hydrophobic spherical silicon oxide aerogel adsorbent. The preparation method comprises the following steps: preparing a sol from a silicon source, a surfactant, a gel catalyst and a solvent, and carrying out ball-drop method, amine modification and supercritical drying. The water system is adopted as a main solvent, the process is convenient, raw materials are easy to obtain, the method is environmentally friendly, cost is saved, and large-scale industrial production is easy to achieve. The prepared transparent hydrophobic spherical silicon oxide aerogel adsorbent has the characteristics of excellent mechanical property, excellent hydrophobic property, efficient gas cycle adsorption performance and the like, and is an ideal high-performance gas adsorption material.

Description

technical field [0001] The invention belongs to the field of preparation of new materials, in particular to a preparation method of a transparent hydrophobic spherical silica aerogel adsorbent. Background technique [0002] Since the Industrial Revolution, with the development of economy and society, greenhouse gas emissions have increased year by year, and global warming has become more and more serious, leading to serious climate and environmental problems, posing serious challenges to the survival and development of human society. agent material. Traditional adsorbents such as silica gel and activated alumina have problems such as limited adsorption capacity, complex preparation process, limited adsorption conditions, weak adsorption selectivity, and poor recycling ability, which are difficult to meet the needs of large-scale greenhouse gas adsorption. Activated carbon is one of the more commonly used adsorbents, but activated carbon has a short lifespan and requires reg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30B01D53/02
CPCB01J20/22B01J20/103B01J20/28016B01J20/28047B01J20/28064B01J20/28011B01D53/02B01D2257/504B01D2257/70Y02P20/54
Inventor 赵志扬孙子谦任建孔勇沈晓冬
Owner NANJING UNIV OF TECH
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