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A method for improving the adsorption performance of activated carbon

A technology of activated carbon and prepolymer, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of enhanced affinity and decreased adsorption capacity, and achieve strong adsorption capacity, good selectivity, and process simple effect

Active Publication Date: 2020-11-03
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 existing modification methods usually increase the surface polarity of activated carbon and at the same time enhance the affinity of the surface of activated carbon with water.
However, although this method can improve the water compatibility of activated carbon, its adsorption capacity also decreases accordingly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] 1.1 Preparation of spherical polymer

[0081] Under argon protection, add 0.020mol 2,2 bis(trifluoromethyl)diaminobenzidine to 20mL DMF in a 250mL three-neck flask equipped with mechanical stirring, stir to dissolve the raw materials completely, and then add to the reaction 0.016mol of biphenyl dianhydride was added to the system, and after 5 hours of reaction, 0.0008mol of norbornene anhydride was added, and the reaction was continued for 20 hours to obtain a polyamic acid solution.

[0082] Using 3.62g of triethylamine as a catalyst, the catalyst was added to the polyamic acid solution, and 14.6g of dehydrating agent acetic anhydride was added, and the reaction was continued for 20h to obtain a polyimide prepolymer solution, and then the polyimide prepolymer After diluting the solution with the polar solvent N-methylpyrrolidone to an equal volume, drop it into methanol to obtain a precipitate, wash and filter the precipitate, repeat the washing, and dry it under vacuu...

Embodiment 2

[0097] 2.1 Steps are the same as 1.1 in Example 1.

[0098] 2.2 Sulfonation and carbonization

[0099] Carry out sulfonation treatment to the spherical polymer of step 2.1, then mix the spherical polymer after the sulfonation treatment with the mass ratio of 1:5 with concentrated sulfuric acid, then add the mixture into the acid-resistant rotary tube furnace, under nitrogen atmosphere, with 3°C / min heating rate for sulfonation as follows:

[0100] Heat to 60°C and stay for 60 minutes;

[0101] Heat to 110°C and stay for 100 minutes;

[0102] Heat to 140°C and stay for 240 minutes;

[0103] Then continue to heat up at a heating rate of 4°C / min, and carry out carbonization treatment in a mixed atmosphere with an oxygen volume percentage of 3%.

[0104] Heat to 360°C and stay for 360 minutes;

[0105] Heat to 540°C and hold for 240 minutes. Lower the temperature to obtain carbonized products.

[0106] 2.3 Activation

[0107] In a rotary tube furnace, under a mixed atmosph...

Embodiment 3

[0111] 3.1 steps are the same as 1.1 in embodiment 1

[0112] 3.2 Sulfonation and carbonization

[0113] Carry out sulfonation treatment to the spherical polymer of step 3.1, then mix the spherical polymer after the sulfonation treatment with a mass ratio of 1:3 with concentrated sulfuric acid, then add the mixture into an acid-resistant rotary tube furnace, under a nitrogen atmosphere, to 2°C / min heating rate for sulfonation as follows:

[0114] Heat to 60°C and stay for 60 minutes;

[0115] Heat to 110°C and stay for 120 minutes;

[0116] Heat to 150°C and stay for 200 minutes;

[0117] Continue to heat up at a heating rate of 3°C / min, and carry out carbonization treatment in a mixed atmosphere with an oxygen volume percentage of 3%:

[0118] Heat to 320°C and stay for 240 minutes;

[0119] Heat to 520°C and hold for 240 minutes. Lower the temperature to obtain carbonized products.

[0120] 3.3 Activation

[0121] In a rotary tube furnace, under a mixed atmosphere of...

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PUM

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Abstract

The invention belongs to the technical field of activated carbon preparation and particularly relates to a method for improving adsorption performance of activated carbon. The method comprises following steps: 1), spherical polymers are subjected to sulfonating and carbonating treatment; 2), the product obtained in the step 1) is activated; 3), the product obtained in the step 2) is acidized by nitric acid. With the adoption of the method, obtained activated carbon can acquire appropriate water compatibility, and has good adsorption performance for metal elements in water or organic matter dissolved in water while the water compatibility is improved.

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 adsorption performance of activated carbon. Background technique [0002] Activated carbon is a commonly used adsorbent. It is a black porous solid with a well-developed pore structure and a high specific surface area. It has a strong adsorption capacity for gases, inorganic or organic substances in solution, and colloidal particles. The adsorption of organic matter by activated carbon is related to the properties of activated carbon itself, the properties of organic matter, and the adsorption conditions, including physical and chemical properties such as specific surface area, pore size distribution, impurity content, hydrophobicity, and surface functional group content of activated carbon; the properties of organic matter itself , such as polarity, hydrophobicity, molecular diameter, acidity and alkalinity; adsorption ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/336B01J20/20C02F1/28
CPCB01J20/20C01B32/336C02F1/283
Inventor 常明珠
Owner SHENZHEN GLOBAL GREENLAND NEW MATERIALS CO LTD