The adsorption of coconut shell activated carbon can be divided into physical adsorption and chemical adsorption. Physical adsorption mainly occurs in the rich micropores of coconut shell activated carbon to remove impurities in water and air. The molecular diameter of these impurities must be smaller than the pore size of coconut shell activated carbon.
Different raw materials and processing techniques result in different micropore structures, specific surface areas and pore diameters of coconut shell activated carbon, which are suitable for different needs. Coconut shell activated carbon not only contains carbon elements, but also contains functional groups on its surface, which chemically react with the adsorbed substances, which often occur on the surface of the coconut shell activated carbon.
The impurities in the medium continuously enter the porous structure of the coconut shell activated carbon through physical adsorption and chemical adsorption, so that the coconut shell activated carbon is saturated and the adsorption effect is reduced. The coconut shell activated carbon after adsorption saturation needs to be activated and regenerated to restore its adsorption capacity and reuse it. Evaluation of the adsorption performance index of coconut shell activated carbon mainly includes methylene blue value, iodine value and caramel adsorption value. The larger the adsorption capacity, the better the adsorption effect.
Coconut shell activated carbon can be used in air purification and water supply and wastewater treatment to separate or collect impurities in air and water media. Granular coconut shell activated carbon has the same function as powdered carbon, and both can be used for water treatment. Granular charcoal is not easy to be lost, can be regenerated and reused, and is used in water treatment processes with light pollution and continuous operation.
Powdered charcoal is not easy to recycle. It is generally used for one-time use and used in intermittent water treatment processes with serious pollution. The granular coconut shell activated carbon for water treatment generally has developed micropores and mesopores, and should meet three requirements: large adsorption capacity, fast adsorption speed, and good mechanical strength. Powder activated carbon requires that in addition to the above characteristics, the smaller the particle size, the better the adsorption effect.
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