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Modified silica aerogel microsphere, and preparation method and application thereof

A silica and aerogel technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve problems such as fragility, strong pH influence, and poor stability, and achieve Strong acid and alkali resistance, improved chelating performance, and high filling rate

Inactive Publication Date: 2017-08-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural polymer adsorbents have poor stability and are greatly affected by pH because their main components are polymer materials, while hydrogels or xerogels are relatively fragile due to their own structure, making them easy to break during transportation.

Method used

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  • Modified silica aerogel microsphere, and preparation method and application thereof
  • Modified silica aerogel microsphere, and preparation method and application thereof
  • Modified silica aerogel microsphere, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Measure 10ml alkaline silica sol, use the nitric acid solution that mass fraction is 10% to adjust its pH value to be 3, then add CETS, silica sol (with SiO 2 The molar ratio of ) to CETS is 1:0.4, and then adding anhydrous ethanol with a volume ratio of 1:1.5 to the above mixed solution under stirring conditions to prepare a mixed precursor;

[0031] (2) Take 67ml of n-heptane, 3ml of n-butanol, 9ml of Span 80, and 1ml of Tween 80 and stir at 40°C for 30 minutes to obtain an oil phase, and then add the mixed precursor obtained in step (1) to the oil phase In, the stirring speed is 400r. min -1 , the volume ratio of the added mixed precursor to the oil phase is 0.4:1, so that it forms a uniform water-in-oil emulsion, then after stirring for 30 minutes, adding ammonia water with a concentration of 2mol / L, and continuing to stir for 20 minutes to stop, Let it stand to separate layers, then wash the lower sediment with absolute ethanol three times, and finally freeze...

Embodiment 2

[0038] (1) Measure 10ml alkaline silica sol, use the nitric acid solution that mass fraction is 10% to adjust its pH value to be 3, then add CETS, silica sol (with SiO 2 The molar ratio of 1) to CETS is 1:1, and then adding anhydrous ethanol with a volume ratio of 1:1.5 to the above mixed solution under stirring conditions to prepare a mixed precursor;

[0039](2) Take 67ml of n-octane, 3ml of n-butanol, 8ml of Span 80, and 2ml of Tween 80 and stir at 40°C for 30 minutes to obtain an oil phase, and then add the mixed precursor obtained in step (1) to the oil phase In, the stirring speed is 500r. min -1 , the volume ratio of the added mixed precursor to the oil phase is 0.1:1, so that it forms a uniform water-in-oil emulsion, and then after stirring for 30 minutes, adding ammonia water with a concentration of 2mol / L, and continuing to stir for 20 minutes to stop, Let it stand to separate layers, then wash the lower sediment with absolute ethanol three times, and finally freez...

Embodiment 3

[0045] (1) Measure 10ml alkaline silica sol, use the nitric acid solution that mass fraction is 10% to adjust its pH value to be 3, then add CETS, silica sol (with SiO 2 The molar ratio of ) to CETS is 1:0.4, and then adding anhydrous ethanol with a volume ratio of 1:1 to the above mixed solution under stirring conditions to prepare a mixed precursor;

[0046] (2) Take 67ml of n-octane, 3ml of n-butanol, 8.5ml of Span 85, and 1.3ml of Tween 65 and stir for 30min at 40°C to obtain an oil phase, and then add the mixed precursor obtained in step (1) to In the oil phase, the stirring speed is 300r. min -1 , the volume ratio of the added mixed precursor to the oil phase is 0.3:1, so that it forms a uniform water-in-oil emulsion, and then after stirring for 30 minutes, adding ammonia water with a concentration of 2mol / L, and continuing to stir for 20 minutes to stop, Let it stand to separate layers, then wash the lower precipitate with absolute ethanol three times, and finally obt...

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Abstract

The invention belongs to the technical field of adsorption materials, and discloses a modified silica airgel microsphere, a preparation method and an application thereof. The preparation method is as follows: use an acid solution to adjust the pH value of the alkaline silica sol to 2-3, then add a cyano-containing alkoxysilane compound, and add absolute ethanol under stirring conditions to obtain a mixed precursor; The mixed precursor is added to the oil phase under stirring conditions to obtain a water-in-oil emulsion, and then ammonia water is added, stirred and mixed evenly, and then allowed to stand for layering, and the lower layer of sediment is removed, washed and dried to obtain a cyano-modified silicon dioxide aerosol Glue microspheres; then added to the hydroxylamine hydrochloride solution dissolved with anhydrous sodium carbonate for reaction, the product was washed and dried to obtain the modified silica airgel microspheres. The invention prepares silica airgel microspheres and performs amidoxime modification on them, and has the advantages of high specific surface area and good adsorption performance.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials, and in particular relates to a modified silica airgel microsphere and a preparation method and application thereof. Background technique [0002] Treatment of heavy metal pollutants requires a product suitable for long-term storage and handling. With the increasing mining, smelting and processing of heavy metal mines, the quantity and types of heavy metals produced have also greatly increased, and at the same time, a large amount of heavy metals have entered the soil and water, causing serious environmental pollution. The methods for treating heavy metal ions in water are usually chemical methods and adsorption methods. The chemical method can quickly remove heavy metal ions in water, and the process is simple, but there are problems such as high metal concentration in the effluent, easy to cause secondary pollution, and difficult to recycle. And the raw material that adsorption me...

Claims

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Application Information

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IPC IPC(8): C01B33/158C01B33/157C01B33/146B01J20/10B01J20/28C02F1/28C02F101/20
CPCC01B33/1585B01J20/103B01J20/28047C01B33/146C01B33/157C01P2004/03C01P2004/32C01P2004/61C01P2006/12C01P2006/14C02F1/281C02F2101/20
Inventor 陈琦峰王慧黄智明
Owner SOUTH CHINA UNIV OF TECH
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