PRODUCTION OF BUCKWHEAT HUSK ACTIVATED CARBON

摘要

PURPOSE:To produce a buckwheat husk activated carbon uniform and high in activity by smoking buckwheat husk at a specified temp. in the atmosphere. CONSTITUTION:This activated carbon is produced by subjecting buckwheat husk being a starting matarial to a smoking treatment at 300-550 deg.C in the atmosphere. When the temp. of the smoking treatment exceeds an upper limit (550 deg.C or over), pore size of a porous part present internally in the smoked carbon is enlarged to reduce activity, and also, ashing is proceeded to remarkably reduce the yield of the smoked carbon. On the other hand, when the temp. of the smoking treatment is lowered to less than lower limit (300 deg.C), porosity becomes low and activity is reduced remarkably. The oxygen content in the smoked carbon is preferably 3-15%. When the temp. is less than the lower limit, long time is required for for smoking and cost effectiveness is no good. On the other hand, when the temp. exceeds the upper limit, the ashing is over- proceeded and the yield of the smoked carbon is reduced. The obtained activated carbon sustains about 1.5 times time effeciency as compared with a conventional palm husk activated carbon.