Method for preparing mesoporous silica molecular sieve fiber

A mesoporous silica and molecular sieve technology, applied in chemical instruments and methods, molecular sieves and alkali exchange compounds, inorganic chemistry, etc., can solve the problems of difficult control of the diameter and length of silica molecular sieve fibers, harsh reaction conditions, etc. The effect of easy operation, high specific surface area and simple process requirements

Inactive Publication Date: 2009-03-18
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In short, the reaction conditions for forming silica molecular sieve fibers in the prior art are relat

Method used

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  • Method for preparing mesoporous silica molecular sieve fiber
  • Method for preparing mesoporous silica molecular sieve fiber
  • Method for preparing mesoporous silica molecular sieve fiber

Examples

Experimental program
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Embodiment 1

[0020] 0.3 g of Pluronic P123 (EO 20 PO 70 EO 20 ) and 2.5 grams of KCl and 0.6 grams of absolute ethanol were dissolved in 35 grams of 2mol.L -1 In the hydrochloric acid aqueous solution, after the surfactant, ethanol and sodium chloride are completely dissolved, further add 2.08 grams of tetraethyl orthosilicate TEOS into the mixed solution, and the solution is stirred at 40°C for 15 minutes and then stands still. Glue chemical process and cooperative self-assembly process to form mesoporous silica molecular sieve fibers. After the material was hydrothermally treated at 100°C for 24 hours, it was cooled to room temperature, filtered, dried in air, and finally fired at 550°C for 6 hours to remove the surfactant. figure 1 It is the scanning electron microscope figure of the sample of embodiment 1, and the sample observed by SEM is a mesoporous silica molecular sieve fiber, and the diameter of the fiber is 200nm, and the length is 150um; the XRD test shows that the sample ha...

Embodiment 2

[0022] 0.3 g of Pluronic F127 (EO 106 PO 70 EO 106 ) and 2.5 grams of KCl and 1.6 grams of absolute ethanol were dissolved in 35 grams of 2mol l.L -1In the hydrochloric acid aqueous solution, after the surfactant, ethanol and potassium chloride are completely dissolved, further add 2.08 grams of tetraethyl orthosilicate TEOS into the mixed solution, and the solution is stirred at 60°C for 20 minutes and then stands still. Glue chemical process and cooperative self-assembly process to form mesoporous silica molecular sieve fibers. After the material was hydrothermally treated at 100°C for 24 hours, it was cooled to room temperature, filtered, dried in air, and finally subjected to high-temperature calcination at 550°C for 4 hours to remove the surfactant. The sample observed by SEM is a mesoporous silica molecular sieve fiber with a diameter of 100nm and a length of 300um; figure 2 The X-ray diffraction spectrum of the sample obtained in Example 2, XRD test shows that the ...

Embodiment 3

[0024] 0.3 g of F108 (EO 132 PO 60 EO 132 ) and 3.2 grams of KCl and 0.8 grams of absolute ethanol were dissolved in 40 grams of 2mol l.L -1 In the hydrochloric acid aqueous solution, after the surfactant, ethanol and sodium sulfate are completely dissolved, further add 2.5 grams of tetraethyl orthosilicate TEOS into the mixed solution, and the solution is stirred at 40°C for 15 minutes, then stands still, and passes through sol, gel Chemical process along with cooperative self-assembly process to form mesoporous silica molecular sieve fibers. After the material was hydrothermally treated at 120°C for 36 hours, it was cooled to room temperature, filtered, dried in air, and finally subjected to high-temperature calcination at 550°C for 6 hours to remove the surfactant. The sample observed by SEM is a mesoporous silica molecular sieve fiber with a diameter of 250nm and a length of 3000um; XRD test shows that the sample has a two-dimensional hexagonal mesoporous structure. Th...

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Abstract

The present invention discloses a method for preparing a wide aperture mesoporous silica molecular sieve fiber. An industrialized nonionics or cationic surfactant is adopted as a template. An organic or inorganic silicon source is adopted as a precursor. In the state where various auxiliary reagents, such as inorganic salt, alcohol and the like, are added, the fiber is synthesized through the cooperative assembly between a surface active agent and inorganic species and a hydrothermal treatment process. The mesoporous silica molecular sieve fiber is between 3 and 20 nm in aperture, between 0.3 and 2.5 cm^3/g in pore volume, and between 600 and 1200 cm^2/g in specific area. The material is easy to obtain, the technical requirements are comparatively simple, and the operation is feasible. The method has a very wide application range in terms of the preparation of composite fortifying fiber and semiconductor porous nanometer tube and nanometer wire in the fields of nanometer microelectrode and aviation material.

Description

technical field [0001] The present invention relates to an inorganic nanoporous material, and more specifically relates to a polymer block copolymer nonionic surfactant or cationic surfactant as a template, in an acidic medium, through inorganic salts and organic alcohols A method of synthesizing mesoporous silica molecular sieve fibers with large pore size under hydrothermal conditions. Background technique [0002] Since Mobil Corporation of the United States synthesized mesoporous molecular sieve M41S with high specific surface area, large pore volume and pore size in 1992, people have done extensive research on its application in catalysis, adsorption, separation and nano-devices. Silica mesoporous molecular sieves with special shapes such as spheres, flakes, regular appearance crystalline silica and fibrous silica have attracted people's attention. Studies have shown that fibrous silica mesoporous molecular sieves have very important applications in micro-laser devices...

Claims

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Application Information

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IPC IPC(8): D01F9/08C01B39/00
Inventor 沈绍典恽越靓毛东森卢冠忠
Owner SHANGHAI INST OF TECH
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