几种有机物对Al_2O_3吸附Eu(Ⅲ)和Am(Ⅲ)的影响

Effect of Organics Upon the Sorption of Eu(Ⅲ) and Am(Ⅲ) Onto Al_2O_3

采用静态法研究了几种有机物存在时，pH对Eu（Ⅲ）和Am（Ⅲ）在Al2O3上吸附的影响。实验结果表明，在Am（Ⅲ）和Eu（Ⅲ）的浓度较低（1～10nmol／L）、液固比为100mL／g及离子强度为0．05mol／kg KNOs等实验条件下，与不加入任何有机物相比，当pH=3．5～5．0时。加入水杨酸、邻苯二甲酸、邻苯二酚后，Al2O3对这2种离子的吸附率随pH增加而增加；当pH〈3．5或pH〉5．0时。pH对这2种离子的吸附率几乎没有影响。加入富里酸后，当pH〈4．5时。2种离子的吸附率随pH增加而增加，且与加入其它有机物相比，富里酸能明显提高这2种离子的吸附率；而当pH〉5．0时，2种离子的吸附率随pH增加而下降。

The effect of pH on the sorption behavior of Eu（ Ⅲ ） and Am（ Ⅲ） onto Al2O3 in the presence of organic ligands was studied by a batch technique. It was found that at the relatively low concentration （1 10 nmol/L）, the same liquid-to-solid ratio V/m （100 mL/g） and the same ionic strength （0.05 mol/kg KNO3 ）, the sorption of both elements increases steeply with increasing pH from 3. 5 to 5. 0 and remains unchanged at relatively low pH （pH〈3.5） or high pH （pH〉5.0） in the presence and absence of phthalate, salicylate, and catechol. While in the presence of fulvic acid, the soption of both elements increases steeply with increasing pH at relatively low pH （pH〈4.5） and it is enhanced obviously relative to that in the presence of other organic ligands. But at relatively high pH （pH〉5.0）, the sorption of both elements is reduced obviously.