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


Niyazi B., Sana S., Nukhet T., Gazi M.

SEPARATION SCIENCE AND TECHNOLOGY, cilt.37, ss.2353-2368, 2002 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 37 Konu: 10
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1081/ss-120003517
  • Dergi Adı: SEPARATION SCIENCE AND TECHNOLOGY
  • Sayfa Sayıları: ss.2353-2368

Özet

An organic-soluble chelating agent, N,N'-di-n-octadecyl ethylenediamine-N,N'-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.