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《Journal of Beijing University of Chemical Technology(Natural Science Edition)》 2007-05
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Preparation and microstructure of hemp stem-based activated carbons

LI HuiQin1 YANG Ru1 XU XinHua1 LI Min1 HAO XinMin2 ZHANG Hua2 ZHANG JianChun1,2 (1.State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029;2.Infantry Center,Military Supply Research Institute of the PLA General Logistics Department,Beijing 100088,China)  
Hemp stem-based activated carbon samples have been prepared by conventional pyrolysis and and by means of activation processes with H3PO4 or ZnCl2.The skeletal microstructure,textural properties,pore size distribution and adsorption properties of the samples were characterized by SEM,N2 adsorption-desorption isotherms at 77 K,and by adsorption of methylene blue and iodine.The results showed that the resultant carbon samples have a porous skeleton,containing two types of parallel end-to-end pore channels.These pores are partitioned by walls in which a large number of smaller micropores are present.Micropores were found to predominate in all of the hemp stem carbons prepared.The sample obtained by the simple carbonization process was microporous with pore sizes mostly less than 1.3 nm,with relatively low surface area and pore volume.Samples obtained using the H3PO4 and ZnCl2 activation processes had a well developed porous texture,with surface areas of 1388 and 1691 m2/g,respectively.The pore size distributions of these two activated carbons were very similar,containing a large quantity of micropores and some mesopores with diameter 2-4 nm.All carbon samples exhibited a multimodal pore size distribution within the micropore range.The adsorption ability of the materials increased with increasing surface area.The sample obtained by ZnCl2 activation had the highest surface area and was relatively regular in shape,resulting in the highest amounts of methylene blue and iodine being adsorbed,followed by the activated carbon obtained by activation by H3PO4,whilst the conventional carbonized carbon prepared without activation had the lowest surface area and affinity for methylene blue and iodine.
【CateGory Index】: TQ424
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