I. Classification of raw material
The activated carbon of this type is made from various kinds of coal, petroleum and their processing products. Activated carbon made from coal is usually activated by water vapor or carbon dioxide gas, and the shape of the product is mainly granular. For the pore size distribution is mostly microporous, it is more suitable for adsorption of substances with smaller molecular diameters. It has the advantage of relatively low production cost as well.
This type of activated carbon is usually activated by chemical method, which is made of coconut shell, fruit shell, wood powder., and the shape of the product is mainly in the form of powder. The pore size distribution can be controlled by adjusting the ratio of chemical activator, which is more flexible and can produce products with more micropores (transition pores) and a wider adsorption range.
II. Classification of shape
- Powdered activated carbon (PAC)
powdered activated carbon has the advantages of fast filtration speed, good adsorption performance, strong decolorization and odor removal ability, economical and durable, etc. The products are widely used in food, beverage, medicine, tap water, sugar, oil and other industries. However, there are two major factors restricting the application of powdered activated carbon in water treatment:
1) it is difficult to separate, recover and regenerate separately after use;
2) compared with granular activated carbon, the cost is higher.
- Granular activated carbon (GAC)
Granular activated carbon mainly uses coal-based carbon as raw material, with a black amorphous appearance; it has a developed pore structure, good adsorption performance, high mechanical strength, easy repeated regeneration, low cost, etc.; a wide range of products Used in drinking water treatment, industrial water, waste gas treatment, decolorization, gas purification and other fields.
- Activated carbon rods (CTO)
Activated carbon rods are processed and compressed on the basis of granular activated carbon to form carbon rods, which can strengthen the removal of residual odors in the water, and the adsorption capacity is faster and stronger. CTO is used in water treatment equipment to remove residual chlorine, chemical pesticides, different colors, odors, and filter fine impurities in water.
- Activated carbon fiber (ACF)
Traditional activated carbon has been activated and processed porous carbon, which is in powder or granular form, while activated carbon fiber is fibrous, with micropores on the fiber, and its ability to adsorb organic gases is higher than that of granular activated carbon in the air Several to several tens of times, 5-6 times higher in aqueous solution, and 100-1000 times faster adsorption rate. ACF is the third generation of new adsorption materials following the widely used powder activated carbon and granular activated carbon (compressed activated carbon).