Sorption of Eu(Ⅲ) and Am(Ⅲ) on Thorium Phosphate Diphosphate

Sorption of Eu(Ⅲ) and Am(Ⅲ) on thorium phosphate diphosphate as a function of equilibrium time, the ratio of adsorbent mass to solution volume (m/V), pH， ionic strength and fulvic acid (FA) were studied under ambient condition using batch technique. The experimental results indicate that sorption of Eu(Ⅲ) and Am(Ⅲ) on thorium phosphate diphosphate are strongly affected by pH values, as compared Eu(Ⅲ) and Am(Ⅲ) adsorption on the same adsorbent. The Eu(Ⅲ) and Am(Ⅲ) adsorption on thorium phosphate diphosphate has the similar pH adsorption curves. The sorption of Eu(Ⅲ) and Am(Ⅲ) increases steeply with increasing pH from 2 to 5. The positive effect of FA on the adsorption of Eu(Ⅲ) and Am(Ⅲ) on thorium phosphate diphosphate are found from the compare study, and it is assumed that surface complexes are formed on the surface of thorium phosphate diphosphate. The study of adsorbent surface characteristics and adsorption mechanism are the important aspects of farther experiment.