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Ferromagnetic multiporous silica gel microsphere and its preparation method

A technology of porous silica gel and ferromagnetism, applied in the direction of magnetism of inorganic materials, liquid separation into beads and granulation, etc., can solve the problems of small specific surface area and unsuitable for application, and achieve large specific surface area, easy industrialization, and easy control of conditions Effect

Inactive Publication Date: 2004-03-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that these magnetic microspheres have a non-porous structure and a small specific surface area, so they are not suitable for application in chemical fields such as chromatographic separation and catalytic reactions.

Method used

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  • Ferromagnetic multiporous silica gel microsphere and its preparation method
  • Ferromagnetic multiporous silica gel microsphere and its preparation method
  • Ferromagnetic multiporous silica gel microsphere and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Synthesis of magnetic porous microspheres

[0023] In a beaker containing 150ml distilled water, add 21.5g FeCl 3 .6H 2 O and 15g NaHCO 3 , And stirring to obtain a clear red iron sol with a pH of 2-2.5. In another beaker, add 225ml silica sol (30%) and 16g urea respectively, stir to dissolve, add concentrated HNO 3 Adjust the pH to 1.5. While stirring, mix the iron sol and the silica sol, adjust the pH to 1.5, quickly add 22ml of formaldehyde (37%) solution under stirring, stop stirring after mixing, and let stand at room temperature overnight for reaction. The composite microspheres generated by the reaction were collected by centrifugation, and washed with water, water-methanol (1:1), methanol and acetone in sequence. Dry under vacuum at 60°C overnight to obtain 31 g of free-flowing yellow microspheres. The composite microspheres are heat-treated and calcined at 300-350°C, 600-650°C and 900-950°C for 2h. After the non-magnetic silica gel particles were removed...

Embodiment 2

[0025] Example 2: Synthesis of magnetic porous microspheres

[0026] In a beaker containing 110ml distilled water, add 5.7g FeCl respectively 3 .6H 2 O and 4.0g NaHCO 3 , And stirring to obtain a clear red iron sol with a pH of 2-2.5. In another beaker, add 90ml silica sol (30%) and 6.4g urea respectively, stir to dissolve, add concentrated HNO 3 Adjust the pH to 1.5. While stirring, mix the iron sol and the silica sol, adjust the pH to 1.5, quickly add 8.8ml of formaldehyde (37%) solution under stirring, stop stirring after mixing, and let stand at room temperature overnight for reaction. The composite microspheres generated by the reaction were collected by centrifugation, and washed with water, water-methanol (1:1), methanol and acetone in sequence. Vacuum drying at 60°C overnight to obtain 11.6 g of yellow microspheres. The composite microspheres are heat-treated and calcined at 250-300℃, 500-550℃ and 850-900℃ for 1-2h. After the non-magnetic silica gel particles were removed ...

Embodiment 3

[0027] Example 3: Synthesis of magnetic porous microspheres

[0028] In a beaker containing 110ml distilled water, add 8.6g FeCl 3 .6H 2 O and 6.0g NaHCO 3 , And stirring to obtain a clear red iron sol with a pH of 2-2.5. In another beaker, add 90ml silica sol (30%) and 6.4g urea respectively, stir to dissolve, add concentrated HNO 3Adjust the pH to 1.5. While stirring, mix the iron sol and the silica sol, adjust the pH to 1.5, quickly add 8.8ml of formaldehyde (37%) solution under stirring, stop stirring after mixing, and let stand at room temperature overnight for reaction. The composite microspheres generated by the reaction were collected by centrifugation, and washed with water, water-methanol (1:1), methanol and acetone in sequence. Vacuum drying at 60°C overnight to obtain 11.6 g of yellow microspheres. The composite microspheres are heat-treated and calcined at 250-300℃, 500-550℃ and 850-900℃ for 1-2h. After the non-magnetic silica gel particles were removed by magnetic se...

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Abstract

A ferromagnetic porous silica gel microsphere with 100-450 sq.m / g is composed of microspheric SiO2 particles as basic material and superparamagnetic Fe2O3 nanoparticles dispersed in said basic material. Its preparing process includes preparing Fe2O3 sol, preparing Fe2O3 / SiO2 sol, preparing composite microspheres, and preparing magnetic porous silica gel.

Description

Technical field [0001] The invention relates to a method for preparing ferromagnetic porous silica microspheres, which belongs to the preparation technology of magnetic porous silica microspheres. Background technique [0002] The transmission and separation system controlled by the magnetic field has many applications in the fields of medicine, biology and chemistry, so it has achieved rapid development in recent years. In these systems, an external magnetic field is usually used to control the directional movement of magnetically responsive particles, so it can be used to directionally release specific therapeutic drugs to a certain part of the body, selectively separate cancer cells from bone marrow cells, Extract target molecules from complex biological samples and other fields. The fluidized bed technology controlled by the magnetic field has become a powerful tool in biotechnology. In the preparation and separation, the magnetic support medium can be immobilized relatively ...

Claims

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Application Information

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IPC IPC(8): B01J2/08H01F1/11H01F1/36
Inventor 万谦宏陈磊张志超李文斌
Owner TIANJIN UNIV
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