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Functionalized silicon coating mesoporous magnetic carrier and preparation method and application thereof

A magnetic carrier, silicon coating technology, applied in chemical instruments and methods, fixed on or in inorganic carriers, adsorbed water/sewage treatment, etc. , to achieve the effect of good treatment of sewage, protection of acid and alkali corrosion, and easy separation

Inactive Publication Date: 2008-03-12
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing technologies have a common defect that the production process is complicated, difficult to control, and high in cost, and these technologies are only obtained in the fields of biological enzyme immobilization, cell and protein separation, targeted drug delivery, and magnetic resonance imaging. application, but the application of heavy metal-containing wastewater in the environment, urban domestic sewage, etc. has not been disclosed

Method used

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  • Functionalized silicon coating mesoporous magnetic carrier and preparation method and application thereof
  • Functionalized silicon coating mesoporous magnetic carrier and preparation method and application thereof
  • Functionalized silicon coating mesoporous magnetic carrier and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Silicon coating by saturated solution method: add 3.0g Fe to 100ml deionized water 3 o 4 After the particles were ultrasonically dispersed for 30 minutes, slowly add 10ml of 0.5moL·dm -3 , sodium silicate solution, and use dilute sulfuric acid to adjust the pH of the solution to about 3.0, keep the reaction at 40±3°C for 3 hours, then raise the temperature to 95±3°C for 1 hour, separate, wash with water and dry to obtain a one-step silicon-coated magnetic carrier;

[0050] (2) Molecular templating: take 3.0 g of the product of step (1) and add it into 100 ml of deionized water for ultrasonic dispersion for 20 minutes, add 2.9 wt% cetyltrimethylammonium bromide solution CTAB under stirring, and separate it after 30 minutes of reaction product;

[0051] (3) Sol-gel method of silicon coating: the product of step (2) was added to 100ml of 95% ethanol, slowly added 10ml of ethyl orthosilicate TEOS, and reacted for 3 hours under the condition of an appropriate amount o...

Embodiment 2

[0055] (1) Silicon coating by saturated solution method: add 8.0g Fe to 150ml deionized water 3 o 4 After the particles are ultrasonically dispersed for 60 minutes, slowly add 25ml of 0.6moL.dm under stirring condition -3 Sodium silicate solution, adjust the pH of the solution to about 3.5 with dilute sulfuric acid, keep it warm at 40±3°C for 3.5 hours, then raise the temperature to 95±3°C for 2 hours, separate, wash with water and dry to obtain a one-step silicon-coated magnetic carrier ;

[0056] (2) Molecular templating: Take 3.0 g of the product of step (1) and add it to 100 ml of deionized water for ultrasonic dispersion for 30 minutes, add 5.7 wt% cetyltrimethylammonium bromide solution CTAB under stirring, and separate after 40 minutes of reaction to obtain product;

[0057] (3) Sol-gel method of silicon coating: add 100ml of 95% ethanol to the product of step (2), slowly add 25ml of ethyl orthosilicate TEOS, react for 4 hours, separate and wash with ethanol, and vac...

Embodiment 3

[0061] (1) Silicon coating by saturated solution method: add 9.0g Fe to 200ml deionized water 3 o 4 After the particles were ultrasonically dispersed for 120 minutes, add 12.5ml of 1.0moL·dm under stirring condition -3 Sodium silicate solution, adjust the pH of the solution to about 4.0 with dilute sulfuric acid, keep it warm at 40±3°C for 3.5 hours, then raise the temperature to 95±3°C for 1.5 hours, separate, wash with water and dry to obtain a one-step silicon-coated magnetic carrier ;

[0062] (2) Molecular templating: Take 3.0 g of the product of step (1) and add it into 100 ml of deionized water for ultrasonic dispersion for 60 minutes, add 2.97 wt% cetyltrimethylammonium bromide solution CTAB under stirring, and separate after 60 minutes of reaction to obtain product;

[0063] (3) sol-gel method silicon coating: add 100ml 98% ethanol to the product of step (2), add 8ml ethyl orthosilicate (TEOS), react 4 hours under the condition that an amount of ammonia is made cat...

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Abstract

The present invention discloses a functionalized silicon coating mesoporous magnetic carrier. The carrier is a compound magnetic carrier having a core-shell structure formed by coating the magnetic ferroferric oxide with the silicon dioxide and an active amido or mercapto is bonded on the surface of the magnetic carrier and the active amido or mercapto can apply the selective chemisorption effect to the target chemical. The present invention simultaneously discloses a preparation method for the carrier, which in particular is that the thickness and uniformity of the silicon film are increased through two times of silicon coating processes so as to effectively protect the magnetic carrier from being corroded by acid and base in the application; the template agent on the surface of the carrier is detracted with high temperature under the inert atmosphere and the porecreating processing is applied to the surface of the carrier so as to increase the effective surface area of the carrier and enhance the processing performance. The fixed active bacterium for the funtionalized silicon coating mesoporous magnetic carrier can be applied in the treatment of the urban domestic sewage delivers good treatment effect and has important meaning to the environment protection.

Description

technical field [0001] The invention relates to functionalized magnetic carrier technology, in particular to a functionalized silicon-coated mesoporous magnetic carrier containing active groups and its preparation method and application. technical background [0002] Functionalized magnetic carrier technology usually refers to the technology of first modifying specific functional groups on the surface of 30nm-25μm magnetic carrier, and then selectively or non-selectively binding small molecules, biomacromolecules and cells through them. This technology was first proposed by Urbain and Steman et al. (US Patent No. 2232294, 1941) when they were studying wastewater treatment. The functionalized magnetic carrier technology has the advantages of simple equipment, flexible operation, good effect, economical and environmental protection, and has become a research topic in recent years. a hot spot. At present, there are two main directions of relevant research: one is the polymer-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F1/28C02F3/34C12N11/14
Inventor 徐政和章伟光成文范军殷霞黄桂华贺晓静李振明
Owner SOUTH CHINA NORMAL UNIVERSITY
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