Eu(Ⅲ)和Am(Ⅲ)在凹凸棒石上的吸附行为

Sorption of Eu(Ⅲ) and Am(Ⅲ) on Attapulgite

摘要: 采用静态批式法研究了Eu(Ⅲ)和Am(Ⅲ)在凹凸棒石上的吸附行为。探讨了液固比（V/m）、震荡时间、pH、离子强度（I）及腐殖酸等因素对吸附的影响。测定了（25±1） ℃下不同离子强度时的吸附等温线。实验结果表明，pH对吸附的影响比较大，在pH=2.5～5.5的吸附边界，离子强度对吸附的影响较小。Eu(Ⅲ)和Am(Ⅲ)在凹凸棒石上的吸附主要通过表面络合进行。 

Abstract: Sorption of Eu(Ⅲ) and Am(Ⅲ) on attapulgite as a function of pH， ionic strength and Eu(Ⅲ) and Am(Ⅲ) concentrations was studied under ambient condition using batch technique. The results indicate that sorption of Eu(Ⅲ) and Am(Ⅲ) on attapulgite is strongly affected by pH values and weakly dependent on ionic strength. The sorption of both elements increases steeply with increasing pH from 2.5 to 5.5. Sorption of Eu(Ⅲ) and Am(Ⅲ) is mainly dominated by surface complexation, although ion exchange also contributes to Eu(Ⅲ) and Am(Ⅲ) sorption.