Preparation and application of amino-modified fe3o4@sio2@msio2 composite particles with mesoporous structure

A technology of composite particles and amino modification, which is applied in the direction of silicon compounds, alkali metal compounds, and other chemical processes, can solve the problems of weak magnetism, decrease in adsorption capacity, and insufficient specific surface area of ​​materials, so as to achieve good superparamagnetism and improve adsorption Ability, processing effect remarkable effect

Inactive Publication Date: 2019-03-19
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But most of the Fe prepared so far 3 o 4 @SiO 2 The material can not meet the actual needs, one is low Fe 3 o 4 The load leads to weak magnetism, and the second is that the specific surface area of ​​the material is not small enough, resulting in a decrease in the adsorption capacity

Method used

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  • Preparation and application of amino-modified fe3o4@sio2@msio2 composite particles with mesoporous structure
  • Preparation and application of amino-modified fe3o4@sio2@msio2 composite particles with mesoporous structure
  • Preparation and application of amino-modified fe3o4@sio2@msio2 composite particles with mesoporous structure

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Embodiment 1

[0055] An amino-modified Fe with mesoporous structure 3 o 4 @SiO 2 @mSiO 2 A method for preparing composite particles, comprising the steps of:

[0056] Step 1: Use a certain amount of ethylene glycol as a solvent, dissolve the ferric ion compound and sodium acetate in ethylene glycol, add an appropriate amount of polyethylene glycol under the condition of magnetic high-speed stirring to continue stirring to obtain a mixed solution, and then transfer to In a high-pressure reactor, heat to a certain temperature to crystallize for several hours, then wash and dry to obtain Fe 3 o 4 The nanoparticle has a diameter of 120nm and a coercive force of 68.95emu / g.

[0057] Crystallization temperature: 200°C, crystallization time: 8h; stirring rate: 600r / min; the molecular weight of polyethylene glycol is required to be 20000; ferric chloride is added to the ethylene glycol solution with a concentration of 0.03mol / L; Anhydrous sodium acetate is 0.08g. The ferric ion compound is: ...

Embodiment 2

[0065] An amino-modified Fe with mesoporous structure 3 o 4 @SiO 2 @mSiO 2 A method for preparing composite particles, comprising:

[0066] Step 1: Preparation of Fe 3 o 4 @SiO 2 powder;

[0067] Step 1.1: Preparation of Fe 3 o 4 Nanoparticles: use ethylene glycol as a solvent, dissolve ferric nitrate and sodium acetate in ethylene glycol, add the concentration of ferric nitrate to 0.03mol / L, and the concentration of sodium acetate to 0.01mol / L after adding to the ethylene glycol solution, stir Then add polyethylene glycol and continue to stir to obtain a mixed solution. The molecular weight of polyethylene glycol is 20,000 to 40,000, and the addition amount is 0.002mol / L, and then transferred to a high-pressure reactor, heated and crystallized, and then washed and dried. Get Fe 3 o 4 Nanoparticles; among them: crystallization temperature: 180°C, crystallization time: 8-24h; stirring rate: 600-900r / min; obtained Fe 3 o 4 The diameter of the nanoparticles is 100-15...

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Abstract

An amino-modified Fe with mesoporous structure 3 o 4 @SiO 2 @mSiO 2 The preparation method of composite particles, the Fe 3 o 4 @SiO 2 The powder is dispersed in a mixed solution of ethanol, deionized water, ammonia and template to obtain a sol solution; then TEOS is added dropwise to prepare Fe with mesoporous structure 3 o 4 @SiO 2 @mSiO 2 Composite particles; the Fe 3 o 4 @SiO 2 @mSiO 2 After the composite particles are dried, add ethylene glycol, ultrasonically separate, then add silane reagent, reflux and stir at high temperature, so that the silane reagent is adsorbed to SiO 2 In the mesoporous channels of the mesoporous channels, a hydrolysis reaction occurs to remove unreacted or unadsorbed silane reagents in the mesoporous channels, and finally the amino-modified Fe is obtained by vacuum drying 3 o 4 @SiO 2 @mSiO 2 , the present invention uses SiO with mesoporous structure 2 As the shell, the nanoparticles Fe 3 o 4 As a magnetic core, it has excellent stability in an acidic solution system, can overcome the difficulty of separation after adsorption by ordinary adsorbents, and improve the efficiency of adsorbing target products, improve the reutilization rate of adsorbents, and have good economic and environmental benefits. benefit.

Description

technical field [0001] The invention belongs to the technical field of separation of heavy metals in nanomaterials and water treatment technology, in particular to an amino-modified Fe with a mesoporous structure 3 o 4 @SiO 2 @mSiO 2 Preparation and application of composite particles. Background technique [0002] With the rapid growth of human society's demand for resources, a large amount of waste water containing heavy metals and organic dyes is increasing day by day in the process of production, processing and use. The heavy metals that are often mentioned mainly refer to elements such as lead (Pb), cadmium (Cd), mercury (Hg), bismuth (Bi), zinc (Zn), cobalt (Co), copper (Cu) and nickel (Ni). There are multiple and complex sources of heavy metal pollution, including smelting processes, exhaust gases from fuel combustion, pollution due to leakage, sewage discharge, litter disposal, and surface runoff from land systems, as well as sewage irrigation and garbage leaching...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/10B01J20/28B01J20/30C02F1/28C02F101/20C02F101/38
CPCB01J20/06B01J20/103B01J20/28009C02F1/288C02F2101/20C02F2101/308C02F2101/38
Inventor 马晶薛娟琴徐尚元
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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