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1.本文研究了硫国羰基三氟丙酮(TTA)与磷酸三丁酯(TBP)的苯溶液,在硝酸介貭中对铈(Ⅲ)、钷的协同萃取,发現有明显的协萃效应,測求了协萃絡合物的組成为M(TTA)_3·2TBP,并求得其平衡常数β32。2.当以路易斯碱性更强的三丁基膦氧化物(TBPO)代替TBP时,則协萃效应更大,且被萃取絡合物的主耍組成形式为M(TTA)_2(NO_3)·2TBPO,并計算了平衡常数β2.2。3.初步討論了协萃效应的机理与中性萃取剂路易斯碱性的关系以及协萃絡合物的可能結构形式。4.測求了混合萃取剂TTA-TBP(或TBPO)-苯对铈与钷萃取时的分离系数,并与TTA单独萃取时的分离系数作了比較。
1. The synergistic extraction of cerium (Ⅲ) and chrysene from nitrate in the presence of a benzene solution of thiocarbonyl trifluoroacetone (TTA) and tributyl phosphate (TBP) was studied in this paper. The composition of the complexing complex was determined to be M (TTA) -3.2TBP, and the equilibrium constant was determined to be 32.2.2 When TBP was replaced by TBPO, which had a stronger Lewis base, The co-extraction effect is larger and the main composition of the extracted complex is M (TTA) 2 (NO 3) · 2TBPO, and the equilibrium constant β 2.2.3 is calculated. The mechanism of the co-extraction effect and Neutral extractant Lewis basicity and the possible structure of the co-extraction complex. The separation coefficient of the mixed extractant TTA-TBP (or TBPO) -benzene on the extraction of cerium and purpurin was determined and compared with the separation factor of TTA alone extraction.