| en |
Predominant hosting lead(II) in ternary mixtures of heavy metal ions by a novel of diethylaminomethyl-calix[4]resorcinarene
Yusof, N. N. M.; Kikuchi, Y. & Kobayashi, T.
Abstract
Heavymetal ions fromsingle and ternary systems
of Pb(II), Cu(II), and Ni(II) adsorbed by calix[4]resorcinarenes
in water–chloroform extraction were studied.Comparison was made of calix[4]resorcinarenes, 2,8,14,20-tetraundecyl calix[4]resorcinarene-4,6,10,12,16,18,22,24-octol, and diethylaminomethyl-calix[4]resorcinarene, 5,11,17,23-tetra(diethylaminomethyl)-2,8,14,20- tetraundecylcalix[4]resorcinarene-4,6,10,12,16,18,22,24-octol, for predominant extraction of their ions from the ternary mixture of
aqueous solution at different pH in a water layer. The hosting
of Pb(II) by the diethylaminomethyl-calix[4]resorcinarene
occurred efficiently at pH 6–7. The hosting of Pb(II), Cu(II),
and Ni(II) ions for the ternary aqueousmixture was applied to
the Langmuir isotherm. Adsorption was studied using nuclear
magnetic resonance spectroscopy in a water–deuterium
chloroform extraction system. Results showed that as the
heavy metal ions were included into the host cavity, the
observation of shifted peaks of water molecules from downfield
to higher field was visible in the nuclear magnetic resonance
spectra, meaning that water molecules were included
with heavy metal ion into the host cavity. The spectra also
showed that the diethylamino group expressed formation of
the coordination complex between the diethylaminomethylcalix[
4]resorcinarene and Pb(II) for the purpose of predominant
hosting of Pb(II).
Keywords
Calix[4]resorcinarenes; Langmuir isotherm; Nuclear magnetic resonance analysis; Wastewater treatment
|
