Role of the humic acid for sorption of radionuclides by synthesized titania

摘要

Present work reports on synthesis, characterization and application of titania powder (anatase) for sorption of ~(137)Cs (monovalent), ~(133)Ba (divalent) and ~(154)Eu (trivalent) radionuclides in the presence and absence of humic acid (Aldrich). In order to obtain a detailed sorption behavior of all the three aforementioned radionuclides, a series of experiments were conducted with respect to effect of pH, humic acid (HA), and concentration of radionuclides. Sorption studies of ~(137)Cs, ~(133)Ba and ~(154)Eu onto synthesized titania have been carried out over a wide range of pH scale varying from 3 to 11 in the presence and absence of Aldrich Humic acid (2mg/L). Sorption of all the three radionuclides rises sharply with the pH of the suspension with saturation value of～ 70%, 80% and 85% respectively for monovalent, bivalent and trivalent radionuclides. Humic acid could not make any influence for sorption of ~(137)Cs, but significantly altered with respect to ~(133)Ba and ~(154)Eu sorption. The sorption data at various concentrations were fitted with Freundlich isotherm model.