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Chelate extraction of transition metal ions by ethylene diamine diacetic acid with n-substituted octadecyl groups

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Chelate extraction of transition metal ions by ethylene diamine diacetic acid with n-substituted octadecyl groups.pdf (353.9Kb)
Date
2002
Author
Bıçak, Niyazi
Şungur, Şana Kutun
Tan, Nükhet
Gazi, Mustafa
Abstract
An organic-soluble chelating agent NN'-di-n-octadecyl ethylenediamine-NN'-diacetic acid (DOED) has been synthesized in two steps by (i) condensation of dibromoethane with 1-amino octadecane (octadecylamine) and (ii) subsequent reaction with sodium chloro acetate in alcohol-water mixture. The chelating agent in 2-ethylhexanol-cyclohexanol (1:1) solutions shows extremely high chelating ability for Ni(II) Co(II) Cu(II) Fe(111) Cr(III) and Cd(II) ions in neutral aqueous solutions. Extractions take place by the formation of (1:1) ligand-to-metal complexes and extraction coefficients are in the range 0.74-0.99. The ligand can be regenerated almost quantitatively by washing its complexes with 1M HCl and 0.2 M NaOH solutions successively. In each extraction step the organic solution exhibits a clear-cut phase separation and does not need salting out. The chelating agent can be regenerated and recycled more than 24 times without losing its extracting ability due to nonhydrolyzability of linkages in its structure. Experiments indicate that in high metal concentrations (more than 1 M) the solvent mixture itself is able to extract appreciable amounts of metal ions (33-53%). The solubility in organic solvents induced by long aliphatic chains seems to be general and the method presented offers possibility of large scale chelate extraction of metal ions of relatively low concentrations.

Source

Separation Science and Technology

Issue

10

Volume

37

Pages

2353-2368

URI

https://hdl.handle.net/20.500.12469/229
https://doi.org/10.1081/SS-120003517

Collections

  • Araştırma Çıktıları / Scopus [1482]
  • Araştırma Çıktıları / WOS [1412]
  • Endüstri Mühendisliği / Industrial Engineering [128]

Keywords

Chelate extraction of metal ions
Ethylenediamine diacetic acids
Metal extraction

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