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机构地区:[1]西北核技术研究所,西安710024
出 处:《核化学与放射化学》2006年第4期207-212,共6页Journal of Nuclear and Radiochemistry
基 金:国家自然科学基金资助项目(29771026)
摘 要:合成了二苯基二硫代膦酸(DPDTPI)、二氯苯基二硫代膦酸(DCPDTPI)、二甲基苯基二硫代膦酸(DMP-DTPI)、二(2,5-二甲基苯基)二硫代膦酸(DDMPDTPI)和二(3,5-二氯-4-甲基苯基)二硫代膦酸(DDCMPDT-PI)共5种二芳基二硫代膦酸类萃取剂,并研究了它们的二甲苯溶液在HClO4-NaClO4体系中,对Am(Ⅲ)和稀土元素的萃取行为。结果表明,萃取能力按DDCMPDTPI>DMPDTPI>DPDTPI>DCPDTPI>DDMPDTPI的顺序减弱;对镅的萃取选择性由大到小的顺序为:DCPDTPI>DPDTPI>DDMPDTPI>DMPDTPI>DDCMPDTPI,所获得的最大分离因数α(Am/Eu)分别为21,4.4,1.8,1.3和1.0。5种二芳基二硫代膦酸对镧系元素的萃取均为正序萃取。Diphenyldithiophosphinic acid (DPDTPI), dichlorophenyldithiophosphinic acid (DCPDTPI), dimethylphenyldithiophosphinic acide ( DMPDTPI), di (2, 5-dimethylphenyl) dithiophosphinic acid (DDMPDTPI), and di(3,5-dichloro 4-methylphenyl) dithiophosphinic acid (DDCMPDTPI) were synthesized. The extraction of Am( Ⅲ ) and Ln( Ⅲ ) from 0. 1 mol/L NaClO4 medium with these diaryldithiophosphinic acids in xylene were investigated. The experimental results show that the order of extraction ability is DDCMPDTPI 〉 DMP- DTPI 〉 DPDTPI〉 DCPDTPI 〉 DDMPDTPI, and extraction selectivity for Am ( Ⅲ) is DCPDTPI 〉 DPDTPI 〉 DDMPDTPI 〉 DMPDTPI 2〉 DDCMPDTPI. The obtained maximum separation factors (Am/Eu) are 21, 4.4, 1.8, 1.3 and 1.0 for DCPDTPI, DPDTPI, DDMPDTPI, DMPDTPI and DDCMPDTPI, respectively. The lg D increases with atomic number of lanthanide for 5 extractants.
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