Activated carbon for wastewater treatment in Nanjing is often used to adsorb molecules. The adsorptivity determines the application, and the adsorptivity is related to the pore size distribution of various carbon types. Take the example of powdered activated carbon made from peat, lignite, and coconut shell based on steam activation: 

Peat-based activated carbon has micro- and meso-pores, suitable for various applications; 

Lignite-based activated carbon has more mesopores and also has larger mesopores, providing excellent accessibility. 

The main pore structure in coconut shell-based activated carbon is micropores, which are suitable for the removal of low molecular weight substances. 

Chemically activated activated carbon is highly porous, mostly in the micro- and mesoporous range, but compared to steam-activated activated carbon, the pore surfaces of chemically activated activated carbon are less hydrophobic and have more negative charges. 

For example, with crushed and compressed granular activated carbon: 

Peat-based extruded activated carbon can be made in various grades with different pore size distributions. The grades with a predominance of micropores are mainly used for the recovery of gold in gaseous phase applications. Grades with both micropores and mesopores are mostly used for liquid phase applications, such as the purification of water by adsorbing small and large molecular impurities. 

The crushed coal-based carbon has both micropores and mesopores, which can be used for various purposes. 

Lump activated carbon based on lignite or coconut shell has the same micro- and mesoporous structure as powdered activated carbon. 

For more information, please visit our website at www.vikenton.com.