What are the classifications of activated carbon?

I. By Raw Material Source

1. Wood-based activated carbon
2. Animal bone/blood-based activated carbon
3. Mineral-based activated carbon
4. Other raw material-based activated carbon
5. Regenerated activated carbon

II. By Manufacturing Method:

1. Chemically activated carbon (Chemical carbon)
2. Physically activated carbon (Physical carbon)
3. Chemical-physical or Physicochemical activated carbon

III. By Appearance/Shape:

1. Powdered activated carbon
2. Granular activated carbon
3. Amorphous granular activated carbon
4. Cylindrical activated carbon
5. Spherical activated carbon
6. Other-shaped activated carbon

IV. By Pore Size:

1. Macropores: Pore diameter > 1000 Å
2. Mesopores (Transitional pores): Pore diameter 20–1000 Å
3. Micropores: Pore diameter < 20 Å
   (The surface area of activated carbon is primarily provided by micropores.)

V. By Material Type:

1. Categories by raw material:

• Wood-based activated carbon: Made from wood chips, charcoal, etc.
• Shell-based activated carbon: Made from coconut shells, walnut shells, apricot shells, etc.
• Coal-based activated carbon: Made from lignite, peat, bituminous coal, anthracite, etc.
• Petroleum-based activated carbon: E.g., asphalt-based spherical activated carbon
• Regenerated activated carbon: Reprocessed from used activated carbon through reactivation.

Note:

1. Å (Angstrom) = 10⁻¹⁰ meters
2. Classification systems may vary slightly across industries or standards.
3. The combination methods (III.3) typically involve sequential or integrated chemical-physical activation processes.