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化工学报  2015 

硫代杯[4]冠-4在硝酸体系中对Sr2+的萃取

DOI: 10.11949/j.issn.0438-1157.20141122, PP. 1035-1041

Keywords: 硫代杯[4]冠-4,合成,Sr2+,萃取,分离

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Abstract:

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、1HNMR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3mol·L-1,有机相中硫代杯[4]冠-4浓度为1×10-3mol·L-1,水相中Sr2+浓度为5×10-4mol·L-1,萃取温度为25℃,萃取80min条件下,平均传质系数为1.36×10-5m·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。

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