Preparation method of reduced graphite oxide-attapulgite composite aerogel

A technology of composite aerogel and attapulgite, which is applied in aerogel preparation, chemical instruments and methods, alkali metal compounds, etc. Agglomeration phenomenon, improve adsorption efficiency, increase the effect of internal channels

Inactive Publication Date: 2016-07-27
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0011] 4. Technical Difficulties in the Preparation of Reduced Graphite Oxide-Attapulgite Composite Airgel
The reduced graphite oxide material has some shortcomings that cannot be overcome by itself. The most prominent problem is that it is prone to agglomeration, resulting in a decrease in the specific surface area and a decrease in surface functional groups, thereby affecting the adsorption effect and adsorption selectivity.
Attapulgite is also easy to agglomerate, reducing the adsorption efficiency

Method used

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  • Preparation method of reduced graphite oxide-attapulgite composite aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Add 1g of attapulgite to 20mL of deionized water, sonicate for 1 hour, and stir for 1-5h; adjust the pH value to 4, according to the mass ratio of Al:attapulgite in the aluminum salt to 1:2-1:30 In the attapulgite colloid, drop the aluminum salt solution with a concentration of 2mol / L; in the process of dropping the aluminum salt solution, keep the pH value of the solution at 4-6, stir for 1h, adjust the pH value to 7, and stir for 1h , adjust the pH value to 9, stir for 1 hour, centrifuge, wash, and dry at 40°C for 5-12 hours to obtain attapulgite coated with aluminum hydroxide;

[0035] Step 2: Add aluminum hydroxide-coated attapulgite to 100mL graphite oxide dispersion with a concentration of 5mg / mL, sonicate for 5-30min, stir for 0.5-2h, pour the mixture into a hydrothermal reaction kettle, and heat at 100℃- Hydrothermal reaction in an oven at 180°C for 12 hours, cooled to room temperature, centrifuged, washed, and freeze-dried to obtain the attapulgite comp...

Embodiment 2

[0039] The preparation method of this example is basically the same as that of Example 1, except that the aluminum salt used is aluminum chloride, and the acid used to adjust the pH value is hydrochloric acid.

[0040] Using hydrochloric acid and aluminum chloride, the anions in the product are mainly chloride ions, which are easy to clean, easy to remove, and easy to detect.

Embodiment 3

[0042] The preparation method of this embodiment is basically the same as that of Example 2, except that the aluminum chloride solution is changed to a 2mol / L ferric chloride solution with the concentration of the same substance.

[0043] Both aluminum and iron ions of attapulgite have very good activation properties, and both can generate corresponding hydroxide protective layers on the surface, which can be removed by acid; in the treated wastewater, compared with aluminum ions, Iron ions are easier to recycle.

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Abstract

The invention relates to a preparation method of aerogel, in particular to a preparation method of reduced graphite oxide-attapulgite composite aerogel. Attapulgite is activated by aluminum salt, and the surface of the activated attapulgite is coated with aluminum hydroxide. The activated attapulgite is subjected to protective coating, accordingly, the structure of the attapulgite can be protected, charge characteristics of the surface of the attapulgite are changed, the attapulgite is easily composited with graphite oxide, after composition, aluminum hydroxide is removed and the original structure of attapulgite is reduced. The composite material realizes uniform composition of two excellent different adsorption materials, the agglomeration phenomenon of a single material in the preparation process can be avoided through composition of two materials, inside channels are enlarged after aluminum hydroxide is removed, and the adsorption efficiency is improved.

Description

technical field [0001] The invention relates to a preparation method of airgel, in particular to a preparation method of reduced graphite oxide-attapulgite composite airgel. Background technique [0002] Brief Introduction of Reduced Graphite Oxide Airgel Adsorbent Materials [0003] Reduced graphite oxide airgel has a three-dimensional network structure, which increases the surface area of ​​the adsorption material, and contains a large number of functional groups such as hydroxyl and carboxyl, so it has better adsorption performance; compared with other inorganic nanomaterials, graphite oxide aerogel Glue is easier to process and shape. [0004] The mechanism of adsorption of reduced graphite oxide is mainly to reduce the oxygen-containing functional groups on graphite oxide, and the groups introduced through the modification reaction achieve the purpose of adsorption through electrostatic attraction, ion exchange and coordination. In addition, the aromatic ring cluster / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/28B01J13/00
CPCB01J13/0091B01J20/08B01J20/12B01J20/20B01J20/28009B01J20/28047B01J2220/42B01J2220/4806
Inventor 张宏森丁慧贤周国江赵艳红于艳江王文豪徐超徐亚超
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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