Dye adsorption on mesoporous activated carbon fiber obtained from pitch containing yttrium complex and the acid treatment effects

摘要

The adsorption isotherms of various acid, direct, and basic dyes on mesoporous activated carbonfibers (Y-ACF) obtained from pitch containing Y(acac){sub}3 were measured and the influence oftheir acid treatment was examined . The Y-ACF highly adsorbed dyes with large molecular size,whereas microporous activated carbon fiber scarcely adsorbed these dyes. Electron probe X-raymicroanalysis indicated that yttrium oxide in Y-ACF, which was produced from the yttrium complex,was thoroughly eluted by acid treatment of Y-ACF. The adsorption amounts of acid and direct dyeswith large molecular size on Y-ACF decreased by acid treatment. On the other hand, the adsorbedamount of basic dye increased by acid treatment. The adsorption characteristics was associated withthe electrostatic properties of the activated carbon fibers.