摘要
为实现高放废液中核素^(90)Sr的分离提取,采用十二烷基苯磺酸(DBS)对4′,4′(5″)-二(叔丁基环己基)-18-冠-6(DtBuCH18C6)进行了改性修饰,合成了新型大孔硅基冠醚吸附剂,并通过SEM、TG-DTA、FT-IR等方法对其进行了表征。结果表明:即使在7 mol/L硝酸环境下,吸附剂中DtBuCH18C6的泄漏量也小于2.03%,有较好的化学稳定性;DBS作为配阴离子促进了DtBuCH18C6与Sr(Ⅱ)的络合,在0.5 mol/L硝酸条件下Sr(Ⅱ)的分配系数提高了约10倍(355.02 cm^(3)/g),且在高酸条件下与硝酸离子呈现协同作用;吸附剂对Sr(Ⅱ)的选择吸附性强,吸附过程符合准二级动力学方程及Langmuir吸附模型,最大饱和吸附容量可达到42.13 mg/g。以1 mol/L硝酸作为洗脱剂,洗脱剂与吸附剂的比例设置为0.90 L/g,接触时间为5 h的条件下,约79%的Sr(Ⅱ)可从吸附剂中洗脱下来,说明吸附剂可重复利用。
For selective separation of ^(90)Sr from HLLW,dodecyl benzenesulfonic acid(DBS)was applied to modified the 4′,4′(5″)-di(tert-butylcyclohexano)-18-crown-6(DtBuCH18C6)and a novel silica-based crown ether was synthesized.The successful synthesis of adsorbent was estimated by characterization methods such as SEM,TG-DTA and FT-IR.The leakage of DtBuCH18C6 from the adsorbent is less than 2.03%in 7 mol/L HNO_(3),suggesting a good chemical stability of adsorbent.DBS worked as a counter ion to enhance the complex formation between DtBuCH18C6 and Sr(Ⅱ),enhancing the K_(d) value at 0.5 mol/L HNO_(3) to 10 times(355.02 cm^(3)/g),and a synergistic effect with nitrate ions was found at higher HNO_(3) concentration.The selective adsorption of Sr(Ⅱ)is proved great,which follows the pseudo-second-order kinetic model and Langmuir model,and the maximum adsorption capacity reaches 42.13 mg/g.Using 1 mol/L HNO_(3) solution as eluent,79%of the adsorbed Sr(Ⅱ)can be eluted from the adsorbent(ratio of eluent vs adsorbent is 0.9 L/g,contact time is 5 h),resulting in effective Sr(Ⅱ)recycle and reuse of adsorbent.
作者
王乙淇
毛聪
郭建锋
桑红吉
吴艳
WANG Yiqi;MAO Cong;GUO Jianfeng;SANG Hongji;WU Yan(School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;404 Company Limited,China National Nuclear Corporation,Jiayuguan 732850,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2022年第10期2004-2014,共11页
Atomic Energy Science and Technology
基金
国家自然科学基金(12175143,11975082)。