Th(Ⅳ)在高庙子膨润土上的吸附行为

Sorption of Th(Ⅳ) on GMZ Bentonite

采用静态批式法研究了Th(Ⅳ)在高庙子膨润土上的吸附行为。探讨了接触时间、pH、离子强度、固液比以及腐殖酸对吸附的影响。测定了293.15 K下的吸附等温线。实验结果表明,pH和离子强度对Th(Ⅳ)吸附的影响很大,腐殖酸在低pH下促进Th(Ⅳ)在高庙子膨润土上的吸附,而在高pH下几乎没有影响;Th(Ⅳ)在高庙子膨润土上的吸附主要通过表面络合和离子交换进行;Langmuir方程可以很好的拟合吸附等温线。

Sorption of Th（Ⅳ） on GMZ bentonite as a function of pH, ionic strength and Th（Ⅳ） concentrations was studied under ambient condition using batch technique. The results indicate that the sorption of Th （Ⅳ） on GMZ bentonite is strongly affected by pH values （1.5-7. 5） and ionic strength. The presence of humic acid increases the sorption of Th（Ⅳ） on GMZ bentonite at low pH, whereas no obvious effect is found at high pH. The sorption of Th（Ⅳ） is dominated by surface complexation and ion exchange. The sorption isotherm of Th（Ⅳ） on GMZ bentonite can be described well by Langmuir model.