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Rayon fibers with and without treatment of a mixture of ammonium sulfate (AS) and diammonium hydrogen phosphate (AP) were heated in a nitrogen atmosphere to various temperatures from 400 to 1000°C, and subsequently activated with steam at that temperature.The surface area and the adsorption capacities for benzene and iodine were measured of the activated carbon fibers and of the original ones.From the precursor treated with AS-AP, highly adsorptive carbon fibers were obtained by steam activation at 900 and 1000°C; the surface areas were between 1500 and 1800 m2/g; the adsorption capacities were 40 to 60% for benzene and 2000 to 2300mg/g for iodine. It was found furthermore that those carbon fibers were obtained with higher yield than the ones from the untreated precursor.Therefore, the treatment with a mixture of AS and AP can be effective to give excellent adsorptivity to the resultant carbon fibers at high yield.

PREPARATION OF ACTIVE CARBON FIBERS FROM RAYON PRECURSOR TREATED WITH AMMONIUM SULFATE