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Preparation method for magnetic carbon aerogel

A carbon airgel and magnetic technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of toxicity in the preparation process and high cost of raw materials

Inactive Publication Date: 2015-10-28
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problems of high raw material cost and high toxicity in the preparation process of the existing carbon aerogel preparation method, and provides a preparation method of magnetic carbon aerogel

Method used

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  • Preparation method for magnetic carbon aerogel
  • Preparation method for magnetic carbon aerogel
  • Preparation method for magnetic carbon aerogel

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specific Embodiment approach 1

[0019] Specific embodiment one: the preparation method of the magnetic carbon airgel of the present embodiment, carry out according to the following steps:

[0020] 1. Weigh carboxymethyl cellulose sodium, glucono-δ-lactone and ferric chloride; add carboxymethyl cellulose sodium and glucono-δ-lactone into water, stir until dissolved, and obtain gel solution; ferric trichloride is dissolved in distilled water, and the pH value is adjusted to be neutral with ammonia water to obtain a neutral ferric chloride solution; the neutral ferric chloride solution is added to the colloidal liquid, and after stirring evenly, Stand at room temperature to obtain a gel;

[0021] 2. After freezing the gel obtained in step 1, put it into a vacuum freeze dryer with a temperature of -50°C to -10°C to freeze-dry to obtain sodium carboxymethylcellulose aerogel;

[0022] Three, the sodium carboxymethyl cellulose aerogel that step 2 obtains is placed in the vacuum tube type heating furnace, feeds N ...

specific Embodiment approach 2

[0023] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, the mass ratio of carboxymethyl cellulose sodium to glucono-δ-lactone is 1: (0.5~0.7), carboxymethyl cellulose The mass ratio of plain sodium to ferric chloride is 1: (0.2-1); others are the same as in Embodiment 1.

specific Embodiment approach 3

[0024] Specific embodiment three: what this embodiment is different from specific embodiment one or two is that in step one, the sum of the quality of sodium carboxymethyl cellulose and glucono-delta-lactone and the volume ratio of water are 1g: (15 ~35) mL; others are the same as the specific embodiment 1 or 2.

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Abstract

The invention relates to a preparation method for an aerogel, especially to a preparation method for a carbon aerogel. The invention aims to overcome the technical problems of high cost for raw materials and great toxicity in preparation in conventional preparation methods for the carbon aerogel. The preparation method comprises the following steps: adding carboxymethylcellulose sodium and glucono delta-lactone into water and carrying out stirring until carboxymethylcellulose sodium and glucono delta-lactone are dissolved so as to obtain a colloidal liquid; adding a neutral ferric trichloride solution into the colloidal liquid, carrying out uniform mixing under stirring and then carrying out standing at room temperature so as to obtain gel; freezing the gel and then carrying out freeze drying so as to obtain a carboxymethylcellulose sodium aerogel; and carbonizing the carboxymethylcellulose sodium aerogel under the protection of N2 so as to obtain the magnetic carbon aerogel. The preparation method has the advantages of simple steps and no toxicity; and the prepared magnetic carbon aerogel has magnetism and a large specific surface area, can be repeatedly recycled, has active bright blue dye adsorption capacity of 59.98 mg / g and removal rate of as high as 42.38%, and is applicable to treatment of dye waste water.

Description

technical field [0001] The invention relates to a preparation method of an airgel. Background technique [0002] Carbon airgel is an excellent catalyst carrier and adsorption material because of its high specific surface area, porosity, low density and high stability network structure, and can be used in dye wastewater treatment. The raw materials for the preparation of traditional carbon aerogels are prepared from resorcinol, formaldehyde, and phenolic resins. For example, the Chinese patent application number 201210190952.5 discloses a method for preparing a carbon aerogel-based spherical corrosion-resistant magnetic material. It is obtained by preparing nickel salt, aldehydes, and aromatic amine phenols into a gel under the action of an organic catalyst and a dispersant, and then drying, dehydrating, and carbonizing. Most of the precursors of this kind of carbon aerogel come from the petroleum industry, which is highly toxic to the human body and the environment, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J32/00C02F1/28C02F1/58
Inventor 王立娟于淼
Owner NORTHEAST FORESTRY UNIVERSITY
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