Adsorption Rate of Orthophosphate Ion during Its Adsorptive Removal from Solution by Activated Carbon

概要

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In order to ensure the effective adsorptive removal of orthophosphate ion from solution, the adsorption equilibrium and adsorption rate of orthophosphate ion on activated carbon were measured at 30℃. The Freundlich equation was applicable to the adsorption isotherms, but an infection was observed in the Freundlich plots of the isotherms. It was concluded that the inflection is a consequence of the pore size distribution of the porous activated carbon. The amounts of orthophosphate ion adsorbed at low concentration and at high concentration seemed to be affected by pH and pore volume, respectively. The adsorption rate of orthophosphate ion into the pores of activated carbon was investigated on the basis of the intraparticle diffusivity (D_i') determined by a batch method. The value of D_i' changed with the adsorption ratio (F). In the range of constant D_i', regardless of F, intraparticle diffusivity was affected by the surface diffusivity rather than the pore diffusivity. The transitional pore volume of activated carbon contributed predominantly to the intraparticle diffusivity of orthophosphate ion.
公益社団法人日本薬学会の論文
1986-01-25