Porosity
Porosity is an important characteristic to denote the adsoprtion capability of activated carbon. The three broad categories are: macroporous ('large' - greater than 50 Å, or larger than 5 nm); mesoporous ('medium' 20 Å - 50 Å, or 2 - 5 nm); and microporous ('small' - less than 20 Å, or up to 2 nm).