杯[8]芳烃羧酸衍生物对铁、镧的萃取研究

STUDY ON EXTRACTION OF Fe^(3+) AND La^(3+) WITH p-TERT-BUTYLCALIX[8] ARENE OCTACARBOXYLIC ACID

合成了对叔丁基杯 [8]芳烃乙酸衍生物。在 (30± 1 )℃ ,I =0 1mol/kg条件下 ,研究了它对Fe3+ 、La3+ 的萃取性能 ;用斜率法研究了萃取反应机理 ,得到了萃取反应平衡常数 ,并发现该萃取剂对Fe3+ 、La3+ 存在着两种不同的萃取机理。

p tert butylcalix[8] arene octacarboxylic acid (H 8L) has been synthesized. The solvent extraction of Fe 3+ and La 3+ with above calixarine is carried out under the condition of (30±1)℃, I =0 1 mol/kg. It is found that H 8L has a good extraction ability towards Fe 3+ and La 3+ with the order of Fe 3+ ,La 3+ . By the slope method, the extraction mechanisms are given out as follows: Fe 3+ +H n L (o) FeH n -3 L (o) +3H +(lg K ex =-3 28±0 03) and La 3+ +H n L (o) (LaH n -1 L) 2+ (o) +H +(lg K ex =1 28±0 06). In the presence of Na + and K + in the aqueous phase, sodium and potassium ions have participated in the extraction process of La 3+ , the composition of intermediate complex is H n -1 5 LKNa 0 5 .