期刊名称：Journal of Environmental Science and Technology
印刷版ISSN：1994-7887
电子版ISSN：2077-2181
出版年度：2008
卷号：1
期号：3
页码：124-134
DOI：10.3923/jest.2008.124.134
出版社：Asian Network for Scientific Information
摘要：Pyrolysis of bagasse, sorghum and millet straws impregnated with ortho phosphoric acid, produced carbon with heterogeneous pore structure and high adsorption capacities. Carbon precursors with particle size of 1180 ÃZ¼m were pyrolysed, to overcome difficulties caused by low density and high ash content. The active carbons obtained from low impregnation ratios ( 3PO4, had strong influence on the yield of carbon. Equilibrium yields were highest at 450Ã,°C, with impregnation ratio of 13.6. Production of active carbons was completed in 45 min. The adsorptive capacities of the active carbons for large molecular weight compounds such as methylene blue were 502, 662 and 390 mg g-1 for bagasse, sorghum and millet straws, respectively. The iodine numbers which indicate the adsorptive capacities for low molecular weight substances were 626, 667 and 593 mg g-1 for bagasse, sorghum and millet straws, respectively. These iodine numbers are more than 18% higher than the value recommended for low molecular weight compounds by American Water Works Association.
