Solvent Extraction Research and Development, Japan
Online ISSN : 2188-4765
Print ISSN : 1341-7215
Original Articles
Extraction Studies of Heavy Metal Ions Employing Benzothiaoxacrown Compounds
Tsermaa TSEND-AYUSHMarco WENZELKerstin GLOEKarsten GLOEJan J. WEIGANDYuri V. FEDOROVOlga A. FEDOROVASergey P. GROMOVPaul G. PLIEGER
Author information
JOURNALS FREE ACCESS

2016 Volume 23 Issue 1 Pages 31-41

Details
Abstract

Benzothiaoxacrown compounds with different numbers of sulfur and oxygen donor atoms (between 4 to 7 donors) dissolved in an organic diluent selectively extract the soft metal ions Ag(I) and Hg(II) from a mixture of Co(II), Ni(II), Cu(II), Zn(II), Ag(I) and Hg(II) present in an aqueous phase. Generally, the extraction efficiency depends on the specific structure of the benzothiaoxacrowns, on the organic diluent employed, as well as on the counter ion present in the aqueous phase. High extractions of Ag(I) and Hg(II) were achieved with all ligands from perchlorate and picrate aqueous media into nitrobenzene organic solutions. In the case of Cu(I) the extraction is significant lower; only ligand 5 with the O2S4 donor atom set gives a moderate extractability. The composition of the extracted complexes depends on the crown ring size and ranges from 1:1 to 1:2 (M:L). Polarographic, UV-Vis and ESI mass spectrometric studies provide a further insight into the complex formation behavior.

Information related to the author
© 2016 Japan Association of Solvent Extraction
Previous article Next article
feedback
Top