Eu(Ⅲ)在泥炭上的吸附行为研究

Study on Adsorption of Europium(Ⅲ) on Peat

采用静态法研究了Eu(Ⅲ)在泥炭上的吸附行为。探讨了固液比、离子强度、pH、腐殖酸等因素对吸附的影响,并测定了不同温度下的吸附等温线。实验结果表明,pH对Eu(Ⅲ)吸附过程影响较大;离子强度有一定影响;低pH情况下腐殖酸会促进Eu(Ⅲ)吸附的进行,高pH情况下腐殖酸会抑制吸附的进行;吸附反应的吉布斯自由能变小于零说明吸附过程自发进行;吸附过程符合Freundlich吸附模型。

Adsorption of Eu （III） on peat by batch method is studied. In the batch technique, the solid-to-liquid ratio （m/V）, pH value, ionic strength and HA on the sorption are studied, and the sorption isotherm at different temperature are determined. The result of batch technique indicates that the influence of pH value on the absorp- tion of Eu （III） ions is stronger, the influence of ionic strength in the sorption process is different. In the low pH value the HA will promote the sorption, and in high pH value HA will restrain the sorption. The Gibbs free energy below zero indicates the adsorption is a spontaneous process. The adsorption isotherm shows that the sorption process can be modelled by Freundlieh model.