硫代杯[4]冠-4在硝酸体系中对Sr^(2+)的萃取  

Extraction of Sr^(2+) with thiacalix[4]arene-biscrowns 4 in HNO_3 solution

作　　者：李洁[1] 周丽娟[1] 张东翔[1] 刘聪[1] Tarasov V.V. 

机构地区：[1]北京理工大学化工与环境学院,北京100081 [2]俄罗斯门捷列夫化工大学,莫斯科125190

出　　处：《化工学报》2015年第3期1035-1041,共7页CIESC Journal

基　　金：国家高技术研究发展计划项目(2013AA051401)~~

摘　　要：乏燃料后处理的高放废液分离过程中,发展新型分离材料实现对锶的高效萃取至关重要。合成了1,2交替构象的硫代杯[4]冠-4(TCACE),利用FT-IR、1H NMR和MS对目标产物进行了表征。研究不同稀释剂对萃取的影响,优化得出CH2Cl2为稀释剂,在硝酸浓度为3 mol·L-1,有机相中硫代杯[4]冠-4浓度为1×10-3 mol·L-1,水相中Sr2+浓度为5×10-4 mol·L-1,萃取温度为25℃,萃取80 min条件下,平均传质系数为1.36×10-5 m·s-1,Sr2+的分配比为0.69。分析了不同条件对硫代杯[4]冠-4对Sr2+的萃取影响,研究了萃取计量方程式,实验结果表明萃合物为{Sr(NO3)2}·{TCACE}。研究了TCACE对其他金属离子Mo6+、Ni2+、Ag+、Sn4+等的萃取效果,表明对Sr2+具有较好的选择性。In the high-level radioactive waste liquid separation process of spent fuel reprocessing, new separation materials are of great significance for the efficient extraction of strontium. In the paper, 1, 2-alternate thiacalix[4]biscrowns 4 （TCACE） was synthesized by using calix[4]arene and triethylene glycol di（p-toluenesulfonate）. TCACE was characterized by FT-IR, 1H NMR and MS. The influence of different diluents on extraction rate was studied, and CH2Cl2 was chosen as diluent by optimization. Extraction rate of Sr2＋was excellent and average mass transfer coefficient was 1.36×10^-5 m·s^-1 under the conditions of CH2Cl2 as organic solvent, nitrate acid concentration was 3 mol·L^-1, TCACE concentration was 1×10^-3 mol·L^-1, Sr^2＋concentration was 5×10^-4 mol·L^-1, extraction was conducted for 80 min and at 25℃. Different technological conditions on extraction for Sr2＋ were studied. Furthermore, the extraction measurement equation was also studied. The extraction complex was{Sr（NO3）2}·{TCACE}as shown by experiment. The extraction effects for other metal ions Mo^6＋, Ni^2＋, Ag^＋, Sn^4＋with TCACE were also studied. It was found that TCACE showed excellent selectivity for Sr2＋.

关 键 词：冠-4 合成 Sr^2+ 萃取 分离 

分 类 号：O625[理学—有机化学]