Activated carbon: It is made of coconut shell, nut shell, wood, coal and other materials through carbonization and activation processes. It has porous and large surface area and can absorb substances in liquid and gas;
charcoal: generally made of wood and other carbonization, without activation, it is generally used for burning, and folks are also used for adsorption and anticorrosion;
Coke: It is made by pouring coal into water after anaerobic heating, generally used for metal smelting ;
Carbon black: It is made of black smoke when the flame is incompletely burned when a flammable substance is heated and burned. It is characterized by very fine and uniform particles of carbon black.