Activated carbon (activated carbon powder) has attracted considerable interest due to its high specific surface area, high porosity, and high adsorption capacity, and is widely used in various industries. A modern manufacturing process for activated carbon utilizes polymers as raw materials. This article describes the production process, activation methods, applications, and advantages of this process compared to conventional, polymer-based activated carbon manufacturing methods .
What is activated carbon?
Activated carbon is a porous material with a large internal surface area (typically 500 to 1500 m²/g), which allows it to absorb various pollutants. Its production uses a variety of raw materials, including wood, coal, coconut shells, and polymers.
Why are polymers used to produce activated carbon?
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Reduction of production costs (through the use of recycled polymers)
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More effective control of the pore structure.
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Reduction of environmental pollution (through the use of polymer waste)
Process for the production of activated carbon using polymers
1. Carbonization (heating in an oxygen-free environment)
The polymer decomposes at high temperatures (usually 400-800 °C) in an oxygen-free environment, forming primary porous carbon-containing materials.
2. Physical activation (using oxidizing gases)
After the carbonization process, the resulting carbon is exposed to gases such as water vapor, carbon dioxide or air at high temperatures to increase its porosity.
3. Chemical activation (using chemicals)
Before heating, the polymer is impregnated with chemicals such as KOH, H₃PO₄ or ZnCl₂ to create greater porosity during the carbonization process.
Comparison of activation methods:
| Activation method | To use | Shortage |
|---|---|---|
| Body | Reducing environmental pollution | High temperature requirements |
| chemicals | Higher porosity | Wastewater must be chemically treated. |
Polymers used in the production of activated carbon.
1. Polyethylene terephthalate (PET)
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Source: recycled plastic bottles
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Advantages: Inexpensive and easy to buy.
2. Polyvinyl chloride (PVC)
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Since hydrochloric acid is produced during carbonation, it must be handled carefully.
3. Polystyrene (PS)
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Efficient conversion to activated carbon
4. Polyacrylonitrile (PAN)
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Suitable for the production of activated carbon with a uniform pore size.
Applications of polymer-based activated carbon
1. Water and wastewater treatment
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Intake of heavy metals (lead, mercury)
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Removal of dyes and organic contaminants.
2. Food and pharmaceutical industry
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The color of the syrup and the vegetable oil has changed.
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Air purification in medical facilities
3. Energy storage
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It is used in supercapacitors and batteries.
4. Environmental protection
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It absorbs toxic gases such as sulfur dioxide and nitrogen oxides.
Advantages of using polymers to produce activated carbon compared to conventional methods.
| Special feature | Polymer method | Traditional method (wood/coconuts) |
|---|---|---|
| It’s worth it | Waste prevention | higher |
| Porosity control | Adaptable depending on the choice of polymer. | limited |
| Environmental compatibility | Plastic recycling | Logging/Mining |
Problems and solutions
1. Contamination during the chemical activation process
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Solution : Use environmentally friendly activation methods ( e.g., plasma activation).
2. Structural homogeneity
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Solution : Improve carbonation temperature and time .
3. Limitations of the scope of application in industry
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Solution : Development of a continuous reactor.
In conclusion
The production of activated carbon from polymers is an economical, efficient, and environmentally friendly process, as it simultaneously solves the problems of polymer waste disposal and the production of highly effective absorbents . Advances in activation technology enable the production of higher quality and efficiency activated carbon.
Assumption:
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Investments in polymer processing for the production of activated carbon.
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Further research into new polymers such as biopolymers is needed .
If you have any questions about the manufacturing process or the applications of activated carbon, please leave a comment below!