2-Steps Preparation Activated Carbon from Solidago Canadensis: Carbonized by Electrial heating and Activated by Microwave Radiation

The activated carbon (AC) was prepared from Solidago Canadensis (SC),an alien invasive plant. The plant was firstly carbonized under nitrogen at 400 ℃ for 90 min in an electrical furnace,and then the product was activated with KOH through microwave radiation. Effects of KOH/C ratio,microwave power,microwave radiation time on the adsorption capacities and yield of AC were evaluated. It indicated that the optimum conditions were KOH/C ratio 2 g/g,microwave power 700 W,and microwave radiation time 6 min. The carbonation process of SC was analyzed by thermogravimetry (TG). The pore structural parameters and surface functional groups of the AC were characterized by nitrogen adsorption-desorption and Fourier Transformed Infrared Spectroscopy (FTIR),respectively. The activation yield,the surface area,the average pore size,and the average micropore size of AC prepared from optimum conditions were 53.75%,1 888 m<'2>/g,0.567 nm,and 0.488 nm,respectively. The adsorption amounts of AC were 302.4 mg/g for methylene blue and 1 470.27 mg/g for iodine.