| Activated carbon is a porous material containing carbon; it has a highly developed pore structure, and very good adsorption. Activated carbon can be made from many kinds of carbon-containing materials. These materials include wood, sawdust, coal, coke, peat, lignin, stone, hard shells, sugar pulp, bone, lignite, petroleum residues, etc.
Coconut shells have become the most commonly used materials for manufacturing activated carbon. |
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Activated carbon is a porous material, mainly composed of material with very a high carbonaceous composition ratio. It has special functional groups and many small pores, and can produce physical or chemical adsorption. So it is widely used in various aspects including environmental pollution control, industrial processes and livelihood uses. The use of activated carbon can be classified according to three aspects, shape and particle size, different raw materials and special purpose: depending on the shape and particle size they can be divided into powdered activated carbon (PAC), granular activated carbon (GAC) and spherical or cylindrical activated carbon; adsorption capacity.
The pores of activated carbon can be divided into three categories by pore size. Big pore: radius 1000 - 1000000 A. Transition pore: radius 20 - 1000 A. Micro-pore: radius - 20 A.
Activated carbon made from different materials has different pore sizes. Activated carbon made from coconut shells has the smallest pore radius. Usually the activated carbon used in water treatment may not have too large a surface area, but should have more transition pores and larger average pore size. Some of the liquid phase activated carbon sold in the Japanese market has the following characteristics: specific surface area of 850 to 1000m2 / g, a pore volume of 0.88 to 1.5ml / g, average pore radius of 40 to 50A.
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