The extraction of Fe3+ and La3+ by synergetic effects of TBP and p-tert-butylcalix[8]arene octacarboxylic acid

Authors
Zhu, ZL Ye, J Gu, JY Lu, GD Chen, YD
Citation
Zl. Zhu et al., The extraction of Fe3+ and La3+ by synergetic effects of TBP and p-tert-butylcalix[8]arene octacarboxylic acid, SEP SCI TEC, 36(12), 2001, pp. 2761-2772
Citations number
17
Categorie Soggetti
Chemistry
Journal title
SEPARATION SCIENCE AND TECHNOLOGY
ISSN journal
01496395 → ACNP
Volume
36
Issue
12
Year of publication
2001
Pages
2761 - 2772
Database
ISI
SICI code
0149-6395(2001)36:12<2761:TEOFAL>2.0.ZU;2-0
Abstract
The extraction of Fe3(+) and La3(+) with p-tert-butylcalix[8]arene octacarb oxylic acid (H8L) and tributyl phosphate (TBP) was studied at 30 +/- 1 degr eesC and ionic strength of 0.1. Fe3+ and La3+ are highly extractible with H 8L; Fe3+ > La3+. The results showed that TBP had a significant synergetic e ffect on the extraction of Fe3+ by H8L. By the slope method, the extraction mechanism is given as Fe3+ + H8L(O) + 2TBP((O)) = (TBP)(2)Fe H5L(O) + 3H(). The equilibrium constant of the extraction reaction was log Kex((S)) = 4 .68 +/- 0.12. However, TBP showed no synergetic effect on the extraction of La3+ with H8L.