Technology for Preparation of Granular Activated Carbon for GasolineVapor Recovery and Liquid Decolorization from Wood Sawdust

Preparation of granular activated carbon for gasoline vapor recovery and liquid decolorization from wood sawdust was conducted byphosphoric acid activation method. Orthogonal experiments were carried out on different effect of phosphoric acid concentration, weight riatio ofphosphoric acid and sawdust, activating temperature on properties of activated carbon. The results showed that the optimal technology was as follows,concentration of phosphoric acid of 85%, weight ratio of phosphoric acid and sawdust of 1.9:1, activation temperature at 430℃, and activation timeof 90 minutes. Under the optimal process, prepared activated carbon had butane working capacity of 12.50 g?100 mL^-1, methylene blue adsorption of255 mg?g^-1, BET surface area and pore volume of 2 024.15 m²?g^-1 and 1.654 3 cm³?g^-1 respectively.