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Magnetic hollow silicon dioxide microspheres and preparation method thereof

A technology of hollow silica and silica, which is applied in the preparation of microspheres, microcapsule preparations, alkali metal oxides/hydroxides, etc., can solve the problem that the particle size uniformity of the template is not easy to control, and achieve magnetic nanoparticles The effect of controllable quantity, high product purity and controllable particle size

Active Publication Date: 2015-10-14
是大高分子材料山西有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the above artificial templates need to go through a series of surface modification and activation steps during the synthesis process, and the particle size uniformity of the synthesized templates is not easy to control, so the development of a new monodisperse, particle size controllable, core-encapsulated Fe 3 o 4 Magnetic hollow silica microspheres with controllable amount of nanoparticles need further research

Method used

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  • Magnetic hollow silicon dioxide microspheres and preparation method thereof
  • Magnetic hollow silicon dioxide microspheres and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Dehydration of freshly collected cyanobacteria with different concentrations of ethanol

[0026] 2) Preparation of magnetic hollow silica microspheres using treated cyanobacteria as templates

[0027] Add 0.046mol Fe 3+ and 0.023mol Fe 2+ , to obtain solution I; mix absolute ethanol, double distilled water, and ammonia water in a volume ratio of 3:3:1 to obtain solution II. The preparation process is carried out in three steps:

[0028] Step 1: Add the treated cyanobacteria into solution I, stir at a low speed, and infiltrate at 20°C for 24 hours. After infiltration, wash the cyanobacteria three times with double distilled water to remove the solvent on the surface of the cyanobacteria;

[0029] The second step: Put the cyanobacteria treated in the first step into 23mL solution II, stir at a low speed, infiltrate at 20°C for 30h, wash with double distilled water three times, and centrifuge to obtain the magnetic Fe 3 o 4 particles of cyanobacteria;

[0030] Th...

Embodiment 2

[0033] The difference between this embodiment and the specific example 1 is: the process of preparing magnetic hollow silica microspheres using the treated cyanobacteria as a template, and other steps are the same as in the first example;

[0034] Add 0.046mol Fe 3+ and 0.023mol Fe 2+ , to obtain solution I; mix absolute ethanol, double distilled water, and ammonia water in a volume ratio of 3:3:1 to obtain solution II. The preparation process is carried out in three steps:

[0035] Step 1: Add the treated cyanobacteria into solution I, stir at low speed, and infiltrate at 30°C for 30 hours. After infiltration, wash the cyanobacteria three times with double distilled water to remove the solvent on the surface of the cyanobacteria;

[0036] The second step: Put the cyanobacteria treated in the first step into 23mL solution II, stir at a low speed, infiltrate at 25°C for 40h, and obtain the magnetic Fe contained inside. 3 o 4 particles of cyanobacteria;

[0037] The third ...

Embodiment 3

[0040] The difference between this embodiment and the specific example 1 is: the process of preparing magnetic hollow silica composite microspheres using the treated cyanobacteria as a template, and other steps are the same as in the first example;

[0041]Add 0.046mol Fe to 100mL of double distilled water that has passed nitrogen 3+ and 0.023mol Fe 2+ , to obtain solution I; mix absolute ethanol, double distilled water, and ammonia water in a volume ratio of 5:5:2 to obtain solution II. The preparation process is carried out in three steps:

[0042] Step 1: Add the treated cyanobacteria into solution I, stir at a low speed, and infiltrate at 40°C for 48 hours. After infiltration, wash the cyanobacteria three times with double distilled water to remove the solvent on the surface of the cyanobacteria;

[0043] The second step: Put the cyanobacteria treated in the first step into 24mL solution II, stir at a low speed, infiltrate at 25°C for 48h, and obtain the magnetic Fe con...

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Abstract

The invention relates to a preparation method for preparing magnetic hollow silicon dioxide microspheres by taking blue-green algae as a template. According to a technological process, the treated blue-green algae are permeated by phases; and after the silicon dioxide coats the surfaces, the blue-green algae are treated at a high temperature to obtain a target product. The preparation method comprises the following steps: step 1, adding the treated blue-green algae into a Fe<2+> or Co<2+> or Mn<2+> and Fe<3+> or Co<3+> salt mixed solution to be subjected to permeation; washing for three times by using double distilled water; step 2, adding the centrifuged permeated blue-green algae into an alkaline alcohol water solution to be permeated to obtain the blue-green algae containing magnetic particles; washing for three times by using the double distilled water, and centrifugally separating; step 3, carrying out silicon dioxide coating on the centrifuged permeated blue-green algae, and centrifuging; drying a centrifuged product and calcining at a high temperature; and removing the blue-green algae template to obtain the magnetic hollow silicon dioxide microspheres. The preparation method provided by the invention has the advantages of simplicity in operation, easy process control, environment friendliness and low cost; and the obtained product has high purity, uniform grain diameter, high magnetic responding speed, regular shape and no hard agglomeration, is suitable for being produced in a large scale, and has wide applications in the aspects of cell separation, immobilized enzymes, protein separation and the like.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, in particular to a preparation method of magnetic hollow silicon dioxide composite microspheres. Background technique [0002] Cyanobacteria mainly grow in fresh water and are important phytoplankton in fresh water. They often multiply in large numbers in warm seasons to form "algae blooms", causing serious environmental pollution. Therefore, the comprehensive utilization of cyanobacteria has achieved major economic and social benefits. [0003] Magnetic hollow silica particles are a kind of adsorbent and adsorbent carrier with excellent properties. They have the characteristics of light weight, high specific surface area and strong adsorption force. Hydrogen and other high-tech fields. The template method is commonly used to prepare magnetic hollow microspheres. F. Caruso et al. using polymer electrolytes, Fe 3 o 4 and silica self-assembled layer by layer on the polystyrene micros...

Claims

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Application Information

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IPC IPC(8): B01J13/02B01J20/10B01J20/30C02F1/28B01J20/28
Inventor 任天瑞张博张雷于广金杨姗庞文文关策王全喜
Owner 是大高分子材料山西有限公司
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