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Three-dimensional porous graphene/attapulgite composite aerogel and preparation method thereof

A composite aerogel, three-dimensional porous technology, applied in chemical instruments and methods, alkali metal compounds, other chemical processes, etc., can solve the problems of undisclosed attapulgite and graphene, achieve excellent mechanical properties, improve stability, The effect of improving adsorption performance

Pending Publication Date: 2020-01-07
明光市铭垚凹凸棒产业科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the research on composite aerogels formed by self-assembly of attapulgite and graphene has not yet been reported. For example, Chinese patents CN107281982A and CN104056386B respectively disclose a mixture of graphene and clay composite elastic aerogel and attapulgite clay powder, Inorganic fiber spraying cotton, graphite tailings powder, coal gangue powder prepared by mixing graphite mesh gel foam mud fire extinguishing agent, the airgel product formed by attapulgite and graphene has not been disclosed in the prior art, and its application In the field of sewage treatment, adsorption of heavy metal ions

Method used

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  • Three-dimensional porous graphene/attapulgite composite aerogel and preparation method thereof
  • Three-dimensional porous graphene/attapulgite composite aerogel and preparation method thereof
  • Three-dimensional porous graphene/attapulgite composite aerogel and preparation method thereof

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preparation example Construction

[0033] A preparation method of three-dimensional porous graphene / attapulgite composite airgel mainly adopts the following steps:

[0034] (1) Prepare a graphene oxide dispersion solution with a concentration of 1 to 50 mg / mL by a modified Hammers method;

[0035] (2) Utilize hydrochloric acid, sulfuric acid and / or phosphoric acid solution to modify the surface of the attapulgite, place the attapulgite in the hydrochloric acid, sulfuric acid and / or phosphoric acid solution, stir and centrifuge, the upper suspension is the attapulgite Suspension, the concentration is 1-100mg / mL;

[0036] (3) Mix and stir the graphene oxide dispersion solution and the attapulgite suspension evenly, and the mass ratio of the attapulgite suspension to the graphene aqueous solution in the mixed solution is 1:1~1:10;

[0037] (4) The obtained mixed solution is self-assembled in a reaction kettle or any closed reaction vessel, the reaction temperature is controlled at 80-150°C, and the chemical react...

Embodiment 1

[0042] Add 2g of graphite and 1g of sodium nitrate to 46ml of concentrated sulfuric acid, ice bath and stir for 30min, then gradually add 6g of potassium permanganate, stir for 60min until the solution is purple-green, then stir for two hours at 37°C. Increase the temperature to 90°C, slowly add 92ml of deionized water and stir continuously with a glass rod, stir for 30min, add 124ml of deionized water, keep the temperature at about 35°C, then add 30ml of 30% hydrogen peroxide until no more bubbles are generated, the solution turns yellow. Wash 3 times with dilute hydrochloric acid and deionized water to obtain a graphene oxide solution.

[0043] Add the original attapulgite with a mass of 20mg into 100ml of deionized water, then add 1mol of sulfuric acid, stir for 24 hours, centrifuge and wash the solution 3 times, and finally take out the upper suspension, as a modified attapulgite suspension, the concentration is 40mg / mL.

[0044] Mix the prepared graphene oxide aqueous ...

Embodiment 2

[0048] Add 2g of graphite and 1g of sodium nitrate to 46ml of concentrated sulfuric acid, ice bath and stir for 30min, then gradually add 6g of potassium permanganate, stir for 60min until the solution is purple-green, then stir for two hours at 37°C. Increase the temperature to 100°C, slowly add 92ml of water and stir continuously with a glass rod, stir for 30min, add 124ml of deionized water, keep the temperature at about 35°C, then add 30ml of 30% hydrogen peroxide until no more bubbles are generated, and the solution becomes yellow. Wash 3 times with dilute hydrochloric acid and deionized water to obtain a graphene oxide solution.

[0049] The original attapulgite with a mass of 20mg was added to 100ml of deionized water, then 1.5mol of phosphoric acid was added, after stirring for 24 hours, the solution was centrifuged and cleaned 3 times, and then the upper suspension was taken out as a modified attapulgite suspension with a concentration of 40mg / mL.

[0050] Mix the p...

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Abstract

The invention relates to a three-dimensional porous graphene / attapulgite composite aerogel and a preparation method thereof. The preparation method comprises: preparing a graphene oxide dispersion solution by using a modified Hammers method; modifying attapulgite to obtain a uniform attapulgite suspension; uniformly mixing and stirring the graphene oxide dispersion solution and the attapulgite suspension; carrying out self-assembly on the obtained mixed solution under a low-temperature wet chemical reaction condition to prepare a composite material hydrogel; and washing the composite materialhydrogel, and carrying out freeze drying to prepare the three-dimensional porous graphene / attapulgite composite aerogel. Compared with the method in the prior art, the method of the invention is simple to operate and low in cost, and the prepared novel adsorbent has a three-dimensional hierarchical porous structure and a large specific surface area, is expected to be applied to treatment of various pollutant wastewater, andprovides technical reference for development of high-performance attapulgite-based adsorbent materials.

Description

technical field [0001] The invention relates to a high-performance adsorbent, in particular to a three-dimensional porous graphene / attapulgite composite airgel with a large surface area three-dimensional multi-level pore structure and a preparation method thereof, which can be used in the field of sewage treatment. Background technique [0002] With the development of society and the improvement of industrialization level, water pollution has become a global problem, and the development of high-performance adsorbents has become a research hotspot in the field of water treatment. Among them, the commonly used method for treating polluted water, that is, the adsorption method, has been extensively studied by scientific researchers. Commonly used adsorbents such as activated carbon, zeolite, and chitosan often have disadvantages such as high price, difficult regeneration, high temperature and pH requirements, and low adsorption efficiency and capacity. In recent years, due to ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/12B01J20/20B01J20/28047B01J20/30C02F1/283C02F2101/20
Inventor 宋雪峰赵晓峰陶锴徐一锋刘继宁张辉
Owner 明光市铭垚凹凸棒产业科技有限公司
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