Abstract: Factors influencing properties of wooden activated carbon such as microwave radiation power, radiation time and flow rate of water vapor were systematically studied via orthogonal experiments.Optimum technology was obtained as follows:microwave radiation power 700 W, radiation time 6 min and flow rate of water vapor 3.09 mL/min.Results showed:yield of wooden activated carbon 20.74%, decolorization for methylene blue 160 mL/g, iodine adsorption 1018.7 mg/g.Microstructure of the wooden activated carbon resembled the shape of honeycomb, which extends inward.Also many superfine holes are available in the wall as channels to connect them together.Compared with that of the first graded activated carbon in the market, it was found that the activated carbon manufactured by microwave radiation possesses a more developed microporous structure.

Key words: microwave radiation, tobacco stems, activated carbon