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本文研究了弱碱性杂环胺双齿配体邻菲绕啉(phen)分别在硫氢酸盐和二氯醋酸介质中,a,a`-联吡啶(bpy)在水杨酸介质中对稀土元素的萃联行为,比较了CCl_3COO~-、SCN~-负离子有效半径和浓度大小对邻菲绕啉-稀土络阳离子萃取率的影响,得出了负离子有效半径愈大,萃取率愈高的结论。在相同阴离子(Sal~-)条件下,萃取RE~(3+)-phen,RE~(3+)-bpy络阳离子的最佳水相pH值相似。由于phen的分子量比bpy大,所以phen的萃取能力也比bpy大。
In this paper, we studied the effect of a, a ’-bipyridine (bpy) on the salicylic acid medium of the weakly basic heterocyclic amine bidentate ligand phenanthroline (phen) in the hydrogensulfate and dichloroacetic acid medium respectively Rare earth element extraction coupling behavior of CCl_3COO ~ -, SCN ~ - negative ions effective radius and concentration of phenanthroline - rare earth complex cation extraction rate, the larger the effective radius of negative ions, the higher the extraction rate in conclusion. Under the same anion condition (Sal ~ -), the optimum pH of RE ~ (3 +) - phen and RE ~ (3 +) - bpy complex cation were similar. Since phen is larger in molecular weight than bpy, phen has greater extraction capacity than bpy.