硅基季铵化分离材料对Tc(Ⅶ)及U、Np、Pu的吸附行为研究

Study on Absorption Behaviour of SiR4N for Tc(Ⅶ),Uranium,Neptunium and Plutonium

研究了硅基季铵化分离材料(简称SiR4N)从硝酸溶液中吸附Tc(Ⅶ)的行为,考察了铀、镎、钚等离子对SiR4N吸附Tc(Ⅶ)的影响。结果表明:硝酸浓度为0.55mol/L时,SiR4N对Tc(Ⅶ)的操作交换容量为21.80mg/g(干);在0.50mol/L HNO3溶液中,SiR4N不吸附U(Ⅵ)、Np(Ⅴ)和Np(Ⅵ),而对Np(Ⅳ)、Pu(Ⅳ)的吸附率分别为84.0%和92.0%;用7.0mol/L HNO3溶液解吸,Tc(Ⅶ)解吸率达99.99%,而流出液中没有检测到Np(Ⅳ)、Pu(Ⅳ)。

The absorption behaviour of SiR4 N for Tc（Ⅶ） has been studied,and the effect of uranium, neptunium and plutonium on absorption Tc（Ⅶ） of SiR4 N has been examined. Experimental results showed that the operation exchange capacity of SiR4 N for Tc（Ⅶ） was 21. 80 mg/g（dry） at the condition of nitric acid concentration of 0. 55 mol/L. Under the concentration of nitric acid of 0. 50 mol/L, Np（Ig） and Pu （IV） could be effectively absorbed on SiR4 N, while Np （V）, Np （VI） and U（ VI ）were not absorbed. 7.0 mol/L HNO3 solution could desorb completely the Tc（Ⅶ） from loading SiR4N, and Pu（IV） and Np（IV） was not desorbed.