Sorption Of Th(â…£) On Muscovite And Albite

Sorption of Th(Ⅳ) on Muscovite and Albite,which are two important components of Granite existing extensively in earth crust, is of great significance for study of Th(Ⅳ) transportation in either host rock or near field environment, particularly for similar chemical behavior and steady valence state Th(Ⅳ) is generally regarded as analogy of actinides and therefore normally employed to research such tetra valence actinide as Pu.In this paper, Muscovite and Albite were characterized respectively by XRD、SEM and FTIR for their structure、appearance and configuration with/without presence of Th(IV) due to its sorption, The sorption of Th(Ⅳ) on Muscovite and Albite were investigated by batch technique as a function of contact time, solid-liquid ratio、pH、initial total concentration、coexist anions、 temperature and Hu-s under atmosphere condition. The results were demonstrated as follows:Sorption of Th(Ⅳ) on Muscovite was strongly dependent on contact time, solid content, pH, particle size, and temperature, an increase in solid content, pH, particle size mesh as well as HA gave rise to distinct change in sorption curves and was responded by corresponding increase in sorption percentage. Moreover the sorption was free from ion strength while temperature acted an positive role in sorption capacity, suggesting temperature was favorable to Th(Ⅳ) sorption on Muscovite and sorption reaction was an spontaneous endothermic process.Based on the sorption effect that Th(Ⅳ) sorption on Muscovite was not affected by ion strength while extremely sensitive to pH, it was found the sorption mechanism was inner-complex under low pH whereas an combination of inner-complex with surface precipitation worked at high pH.Like sorption of Th(Ⅳ) on Muscovite, sorption of Th(Ⅳ) on Albite beared similar phenomena with Muscovite, Sorption was significantly influenced and enhanced by such factors as higher adsorbent concentration, lower adsorbate concentration, high pH and HA/FA.Furthermore, Sorption of Th(Ⅳ) on Albite was related to foreign anions, it was found PO43+contributed to positive sorption effect of Th(Ⅳ) percentage in contrast with negative sorption effect of SO42-.Finally, instead of failure in obvious effect of Th(Ⅳ) sorption on Muscovite, there was an increase in sorption percentage of Th(Ⅳ) on Albite with increasing ion strength, from～0to1.2M NaClO4range Th(Ⅳ) sorption percentage rised rapidly by a margin about30%. This showed inner-complex was the main sorption mechanism at low pH values along with intense pH reliance.