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Preparation method and application of porous silicon dioxide microsphere adsorbent

A porous silica and microsphere adsorption technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc. Promotion and application, etc., to achieve the effect of simple process, economical and practical, and good fluidity

Inactive Publication Date: 2015-03-11
PUTIAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] There are various preparation methods of porous silica, such as liquid phase method, organic template method, co-condensation method, sol-gel method, etc., but these methods are high in cost and long in preparation time, which is not conducive to popularization and application.
Therefore, for the preparation of silica spheres, how to overcome the shortcomings of complex preparation process, strict process conditions and high cost is still the main problem people face.

Method used

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  • Preparation method and application of porous silicon dioxide microsphere adsorbent
  • Preparation method and application of porous silicon dioxide microsphere adsorbent
  • Preparation method and application of porous silicon dioxide microsphere adsorbent

Examples

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preparation example Construction

[0023] A preparation method of porous silica microsphere adsorbent, comprising the following steps:

[0024] 1) Add ammonia water to isopropanol and deionized water to prepare a mixed solution of ammonia water-isopropanol-deionized water, then add ethyl orthosilicate to the above mixed solution, and stir at room temperature for 1.5-2.5 hours;

[0025] The volume ratio of the ethyl orthosilicate, ammonia water, isopropanol and deionized water is 1:0.8-1.2:18-22:3-5;

[0026] 2) Centrifuge the above-mentioned mixed solution after stirring for 4-6 min at a rotating speed of 8000-10000 r / min, discard the supernatant to obtain a precipitate, and then wash the above-mentioned precipitate with water for 2-4 times to obtain silica microspheres ;

[0027] 3) The above-mentioned silica microspheres are dispersed in water, and the add-on of the water is 28-32 times of ethyl orthosilicate, and then soluble polyvinylpyrrolidone is added, and the mol ratio of the polyvinylpyrrolidone and s...

Embodiment 1

[0035] A preparation method of porous silica microsphere adsorbent, comprising the following steps:

[0036] 1) Add 10 mL of ammonia water to 200 mL of isopropanol and 40 mL of deionized water to prepare a mixed solution of ammonia water-isopropanol-deionized water, then add 10 mL of ethyl orthosilicate to the above mixed solution, and stir at room temperature for 2 hours;

[0037] 2) Centrifuge the above-mentioned mixed solution at a rotating speed of 9000 r / min for 5 min, discard the supernatant to obtain a precipitate, then wash the above-mentioned precipitate 3 times with water for 5 min each time to obtain silicon dioxide Microspheres;

[0038] 3) Disperse the above-mentioned silica microspheres in 300 mL of water, add soluble polyvinylpyrrolidone K30, the molar ratio of polyvinylpyrrolidone to silica is 10:1, and the mixed solution is cooled to room temperature after being condensed by water circulation for 3 hours;

[0039] 4) Add 0.15g / mL NaOH solution to the above co...

Embodiment 2

[0058] A preparation method of porous silica microsphere adsorbent, comprising the following steps:

[0059] 1) Add 8 mL of ammonia water to 180 mL of isopropanol and 30 mL of deionized water to prepare a mixed solution of ammonia water-isopropanol-deionized water, then add 10 mL of ethyl orthosilicate to the above mixed solution, and stir at room temperature for 1.5 h ;

[0060] 2) Centrifuge the above-mentioned mixed solution at a rotating speed of 8000 r / min for 6 min, discard the supernatant to obtain a precipitate, and then wash the above-mentioned precipitate 4 times with water for 4 min each time to obtain silicon dioxide solid;

[0061] 3) Disperse the above-mentioned silica microspheres in 280 mL of water, add a certain amount of soluble polyvinylpyrrolidone K 30, the molar ratio of polyvinylpyrrolidone to silica is 12:1, and after the mixed solution is condensed by water circulation for 3.5h, cooled to room temperature;

[0062] 4) Add 0.15g / mL NaOH solution to th...

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Abstract

The invention discloses a preparation method and an application of a porous silicon dioxide microsphere adsorbent. TEOS (tetraethyl orthosilicate) is used as a silicon source, ammonia water is used as a catalyst, isopropanol is used as a solvent, silicon dioxide microspheres are obtained through a hydrolysis-condensation polymerization reaction, and then the porous silicon dioxide microsphere adsorbent is obtained through a series of reactions. The synthesized porous silicon dioxide microspheres are high in mechanical strength, good in mobility and porous, have the larger specific surface area and the higher adsorption capacity and can be applied to wastewater treatment, particularly to treatment of wastewater containing high-toxicity organic pollutants and heavy metal pollutants. The preparation method has characteristics of simple technology, low cost, mild condition, economy, applicability, practicability and the like, meets actual production requirements and can be popularized and applied on a large scale.

Description

technical field [0001] The invention belongs to the field of water environment treatment, and in particular relates to a preparation method of a porous silica microsphere adsorbent and its application in water environment treatment. Background technique [0002] Heavy metals are substances that make up the earth's crust and are widely distributed in nature. With the development of industrial society, a large amount of untreated industrial wastewater containing heavy metals is discharged into natural water bodies. This situation makes heavy metals become one of the main pollution sources in the water environment, causing huge damage to human health and ecological environment. hazard. Therefore, the treatment of heavy metals in industrial wastewater will be a major project. At present, the treatment technologies for wastewater containing heavy metals mainly include ion exchange method, dissolved air flotation method, membrane technology, precipitation method, etc., but they ...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F1/62
CPCB01J20/103B01J20/28019B01J20/28054C02F1/281C02F2101/20
Inventor 黄建辉陈建琴林文婷段松林江长楠林强
Owner PUTIAN UNIV
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