Preparation method of magnetized silicon dioxide aerogel

A technology of silica and aerogel, applied in chemical instruments and methods, alkali metal oxides/hydroxides, silicon compounds, etc. Low airgel density and other issues, to achieve the effect of low preparation cost, easy large-scale production, and increase light transmittance

Active Publication Date: 2011-09-14
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the inhomogeneous distribution of the pore size of the obtained silica aerogel (the pore size is 15-30nm), the cracking of the silica aerogel is caused by the uneven stress of the pores during the drying process under normal pressure.
[0005] Due to the low density, small particle size, and strong hydrophobicity of the silica airgel obtained by the above method, there are two problems in water treatment applications: (1) cannot fully contact with the target pollutants in water; (2) difficult to obtain after adsorption treatment. Realize solid-liquid separation

Method used

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  • Preparation method of magnetized silicon dioxide aerogel
  • Preparation method of magnetized silicon dioxide aerogel

Examples

Experimental program
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Embodiment 1

[0033] Embodiment 1: Preparation of magnetized silica airgel

[0034] Prepare 0.1mol / L ferrous chloride solution and prepare 0.001mol / L sodium hydroxide solution. Stir continuously at a constant temperature of 50°C, slowly add the above-prepared sodium hydroxide solution dropwise to the above-prepared ferrous chloride solution to pH = 13, continue stirring and reacting for 2 hours to obtain a nano-scale ferric oxide dispersion. Dilute water glass (Be°=30) with deionized water to 1 time of its original volume, and perform ion exchange with 001×14.5 strongly acidic cation exchange resin to obtain a water sol. At room temperature, add glycerol to the hydrosol as a drying control chemical additive, and then add nano-scale iron ferric oxide dispersion to obtain a mixed solution, and the volume ratio of glycerol to hydrosol is 0.01, and the nano-scale iron ferric oxide The volume ratio of the dispersion liquid to the water sol is 0.01, and the mixed liquid is continuously stirred a...

Embodiment 2

[0035] Embodiment 2: Preparation of magnetized silica airgel

[0036] Prepare 1mol / L ferrous chloride solution and 1mol / L sodium hydroxide solution. Stir continuously at a constant temperature of 25°C, slowly add the above-prepared sodium hydroxide solution dropwise to the above-prepared ferrous chloride solution until pH = 11, and continue stirring for 1 hour to obtain a nano-scale ferric oxide dispersion. Dilute the water glass (Be°=50) with deionized water to 4 times the original volume, and perform ion exchange with D152 weakly acidic cation exchange resin to obtain a hydrosol. At room temperature, add formamide to the hydrosol as a drying control chemical additive, and then add nano-scale ferric oxide dispersion to obtain a mixed solution, and the volume ratio of formamide to hydrosol is 0.5, and the nano-scale ferric oxide dispersion The volume ratio to the hydrosol is 1, and the mixed solution is continuously stirred at a constant temperature of 25°C, and the sodium hy...

Embodiment 3

[0037] Embodiment 3: Preparation of magnetized silica airgel

[0038] Prepare 10mol / L ferrous sulfate solution and 10mol / L ammonia solution. Stir continuously at a constant temperature of 5°C, slowly add the above-prepared ammonia solution dropwise to the above-prepared ferrous sulfate solution to pH = 10, and continue stirring for 1 hour to obtain a nano-scale ferric oxide dispersion. Dilute water glass (Be°=50) with deionized water to 6 times its original volume, and perform ion exchange with 001×7 strong acidic cation exchange resin to obtain a hydrosol. At room temperature, add oxalic acid to the hydrosol as a drying control chemical additive, and then add nano-scale ferric oxide dispersion to obtain a mixed solution, and the volume ratio of oxalic acid to hydrosol is 1, and the nano-scale ferric oxide dispersion and water The volume ratio of the sol is 10, and the mixed solution is continuously stirred at a constant temperature of 5°C, and the ammonia solution prepared a...

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Abstract

The invention belongs to the field of preparation of water treatment materials, and in particular relates to a preparation method of magnetized silicon dioxide aero-gel. The preparation method comprises the following steps of: with water glass as a silica source, adding nano-grade ferroferric oxide dispersed liquid and a drying control chemical additive to obtain the magnetized silicon dioxide aerogel at ordinary pressure and drying conditions through a sol-gel method and surface modification. The magnetized silicon dioxide aerogel is a nano-grade porous material, the average pore size of each pore is 3-5nm; the magnetized silicon dioxide aerogel has a saturated magnetization intensity of 0.4-0.8emu.g-1. The preparation method has low cost; and the magnetized silicon dioxide aerogel prepared by adopting the preparation method disclosed by the invention has magnetism, can realize the solid-liquid separation effectively under the action of an external magnetic field, and is suitable for mass production.

Description

technical field [0001] The invention belongs to the field of preparation of water treatment materials, and in particular relates to a preparation method of magnetized silica airgel. Background technique [0002] Adsorption is one of the commonly used water treatment technologies, which has the advantages of simple operation and strong adaptability. The adsorption method mainly relies on materials with large specific surface area and adsorption capacity to separate and remove pollutants from water, so as to achieve the purpose of water purification. High-quality adsorption materials should have the characteristics of strong adsorption capacity, low cost, and easy recovery. It is the core of adsorption water treatment technology. [0003] Silica airgel is a new type of lightweight nano-porous material developed in recent years. It has large specific surface area, high porosity, low density and unique optical, acoustic, thermal and electrical properties. It has been extensive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30
Inventor 刘会娟武骁宇曲久辉刘锐平兰华春
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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