Coal-based activated carbon is a kind of black powder granular or pellet-like Amorphous carbon with porous carbon and a small amount of hydrogen, hydrogen, sulfur, nitrogen and chlorine also has fine graphite-like structure.websiteIt has a large surface area (500 ~ 1000 m 2/g) only with a small grain and irregular stacking between layers. It has a strong adsorption ability to adsorb gas liquid or colloidal solid on its surface. Sentence is too long, please supply a shorter sentence.