Preparation of high surface area activated carbons from tobacco stems with K₂CO₃ activation using microwave radiation
2008
Li, Wei | Zhang, Li-bo | Peng, Jin-hui | Li, Ning | Zhu, Xue-yun
In this paper, activated carbons with high surface area from carbonized tobacco stems with K₂CO₃ activation by microwave radiation were investigated. Effects of microwave radiation time and K₂CO₃/C ratio on the yield and adsorption capacities of activated carbons were evaluated. Experimental results indicated that the optimum conditions were as follow: microwave power 700W; microwave radiation time 30min; K₂CO₃/C ratio 1.5:1. Iodine number, amount of methylene blue adsorption and the yield of activated carbon prepared under optimum conditions were 1834mg/g, 517.5mg/g and 16.65%, respectively. Surface area, micropore volume and pore size distribution (PSD) of the carbons were determined by the BET, H-K and DFT methods. Results showed that activated carbons had a micropore content about 59.98% and a small number of mesopores and macropores; BET specific surface area and total pore volume were 2557m²/g and 1.647cm³/g, respectively.
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