磷钼酸铵/聚丙烯酸复合凝胶吸附剂的合成及对铯的分离  

Synthesis of Ammonium Phosphomolybdate/Polyacrylic Acid Composite Gel Adsorbent and Separation of Cesium

作　　者：胡佩卓[1] 刘莲 王海静 肖智文 南矞 钱丽娟[1] HU Pei-zhuo;LIU Lian;WANG Hai-jing;XIAO Zhi-wen;NAN Yu;QIAN Li-juan(School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China)

机构地区：[1]兰州大学核科学与技术学院

出　　处：《核化学与放射化学》2019年第4期361-369,I0002,共10页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(21571088)

摘　　要：以丙烯酸为基底合成了磷钼酸铵/聚丙烯酸复合吸附剂(AMP-PA)。采用红外光谱(FTIR)、X射线衍射(XRD)等方法对AMP-PA进行表征。研究了振荡时间、酸度、Cs+浓度对铯吸附的影响,及多种离子存在下吸附剂对铯离子的选择性吸附。静态实验结果表明:AMP-PA吸附铯大约5 h达到平衡;HNO3浓度在0~3.0 mol/L范围内对铯的吸附量影响不大,吸附过程符合Langmuir方程,计算得到的最大吸附量达到4.7 mg/g;采用3.0 mol/L NH4Cl+1.0 mol/L HNO3解吸,解吸率大约为70%;多种离子存在下对铯离子具有选择性吸附。动态柱实验发现,AMP-PA对铯的吸附量为4.32 mg/g,解吸率约为50.4%。在高浓度杂质离子Na^+、K^+、Sr^2+、Co^2+、Fe^3+、Zn^2+、Ca^2+存在下,AMP-PA柱可以选择性分离铯,在铯的淋洗液中Co^2+低于检测限,含量最高的Fe3+分离因子为3,浓度比起始浓度降低四个数量级。Ammonium phosphomolybdate/polyacrylic acid composite adsorbent(AMP-PA) was synthesized. The AMP-PA was characterized by FTIR and XRD. The effect of contact time, nitrate acid concentration, Cs+ concentration and co-existing cations was studied by batch experiments. The static experiment results show that the equilibrium of cesium adsorption at AMP-PA is about 5 hours. The concentration of HNO3 has little effect on the adsorption amount of cesium in the range of 0-3.0 mol/L. The adsorption process can be described by Langmuir equation, and the calculated adsorption capacity reaches 4.7 mg/g. The desorption rate is about 70% using 3.0 mol/L NH4Cl+1.0 mol/L HNO3. Cesium ions can be selectively adsorbed in the presence of foreign cations. The column operations show that cesium adsorption capacity on AMP-PA is 4.32 mg/g, and the desorption rate is about 50.4%. Cesium can be selectively extracted in the presence of Na^+, K^+, Sr^2+, Co^2+, Fe^3+, Zn^2+, and Ca^2+. In the leaching solution of cesium, the concentration of Co^2+ is lower than detection concentration. The concentration of Fe^3+ is the highest among the foreign cations, which separation factor is about 3, and is four orders of magnitude lower than the initial concentration.

关 键 词：铯 磷钼酸铵 聚丙烯酸 吸附 

分 类 号：TL283[核科学技术—核燃料循环与材料] TL941