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A method for improving the performance of activated carbon to adsorb organic matter and the product and application thereof

A technology of activated carbon adsorption and activated carbon, applied in a method and the field of products prepared therefrom

Active Publication Date: 2020-07-14
SHENZHEN GLOBAL GREENLAND NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of existing activated carbon-based adsorbents still needs to be further improved to increase their selective adsorption capacity for specific types of components

Method used

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  • A method for improving the performance of activated carbon to adsorb organic matter and the product and application thereof
  • A method for improving the performance of activated carbon to adsorb organic matter and the product and application thereof

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[0070] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0071] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0073] 1.1 Preparation of spherical polymer

[0074] Under argon protection, add 0.011mol 2,2 bis(trifluoromethyl)diaminobenzidine to 14.94g polar solvent N,N-dimethylacetamide in a 250mL three-necked flask equipped with mechanical stirring , after stirring to completely dissolve the diamine, add 0.01mol 3,3',4,4'-diphenyl ether tetracarboxylic dianhydride to the reaction system, react for 4 hours, add 0.0005mol norbornene anhydride, and continue the reaction for 24 hours to obtain Polyamic acid soluble.

[0075] The mixture of 2.26g triethylamine and 0.22g pyridine is used as a catalyst, the catalyst is added to the polyamic acid solution, and 9.24g dehydrating agent acetic anhydride is added, and the reaction is continued for 24 hours to obtain a polyimide prepolymer solution, and then the polyimide After diluting the imide prepolymer solution with the polar solvent N-methylpyrrolidone to an equal volume, drop it into methanol to obtain a precipitate, wash and filter the pr...

Embodiment 2

[0086]2.1 step is the same as 1.1 in embodiment 1

[0087] 2.2 Carbonization

[0088] Put the spherical polymer in step 2.1 into an acid-resistant and alkali-resistant rotary tube furnace, and carry out the following carbonization treatment at a heating rate of 2°C / min under a nitrogen atmosphere and an ammonia atmosphere (flow ratio: 4:1):

[0089] Heat to 110°C and stay for 100 minutes;

[0090] Heat to 500°C and stay for 400 minutes;

[0091] Continue to heat up at a heating rate of 3°C / min, and carry out carbonization treatment in a mixed atmosphere with a volume percentage of 3% of oxygen. At this time, because ammonia gas is generated during the carbonization process of the spherical polymer, the amount of ammonia gas introduced is reduced to The flow ratio is 8:1:

[0092] Heat to 650°C and hold for 600 minutes. Lower the temperature to obtain carbonized products.

[0093] 2.3 Activation

[0094] In a rotary tube furnace, under a mixed atmosphere of water vapor, n...

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Abstract

The invention provides a method for improving the organic matter adsorption performance of activated carbon, a prepared product and use thereof. Under an alkaline atmosphere, the amount of unstable oxygen-containing groups on the surface of a spherical polymer decreases, thus reducing the activity stable points of metal ions on the surface of activated carbon, lowering the adsorption capacity to metal ions, and enhancing the adsorptive selectivity to organic matters. The activated carbon prepared by the method can realize effective adsorption of organic matters. The preparation process of theactivated carbon is simple, and by adjusting the carbonization temperature, the activation temperature and the carbonization atmosphere, optionally adjusting the activation atmosphere in the preparation process of the activated carbon, modification treatment of activated carbon can be completed, subsequent re-processing is not needed, and the technological process can save cost. The modification treatment also utilizes the alkaline gas generated by the spherical polymer itself to serve as the modifier, and realizes rational utilization of energy.

Description

technical field [0001] The invention belongs to the technical field of activated carbon preparation, and in particular relates to a method for improving the performance of activated carbon for absorbing organic matter and the prepared product and use thereof. Background technique [0002] The modification of activated carbon is one of the important ways to develop new adsorbents in the chemical industry. The modification includes the modification of surface functional groups, and the surface functional groups of activated carbon mainly include hydroxyl, carboxyl, ester, phenolic hydroxyl, aldehyde, ketone, quinone, hydroquinone and the like. There are two main ways to generate functional groups on the surface of activated carbon: one is the residue left by incomplete carbonization during the preparation of activated carbon, which is often inevitable and difficult to be effectively controlled; the other is to use modifiers to modify the surface of activated carbon. propertie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01D53/02B01J20/30C01B32/30C01B32/336
CPCB01D53/02B01J20/20C01B32/30C01B32/336
Inventor 常明珠
Owner SHENZHEN GLOBAL GREENLAND NEW MATERIALS CO LTD
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