Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 154, Issue 1-3, Pages 29-32Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2007.09.096
Keywords
diazo-coupling calyx[n]arenes (n=4, 6); diazo compounds; solvent extraction; alkali metal ions; transition metal ions
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The ionophore solvent extraction of various alkali metal and transition metal cations from the aqueous phase to the organic phase was carried out by using diazo-coupling calix[n]arenes [p-(4-phenylazophenylazo)calix[4]arene (M) and p-phenylazocalix[6]arene (L2)], phenol derivatives [2,6-dimethyl-3-phenylazophenol (L3), 2-(5-bromo-2-pyridylazo)-5-diethylamino phenol (U), 2-chloro-4-nitro(phenylazo)-5-sec-butyl-2-phenol (L5) and 2-chloro-4- nitro(phenylazo)-5-tert-butyl-2-phenol (L6)], and ester derivatives [quinoline-8-benzoate (L7), phenyl-1,4-dibenzoate (L8), p-tolyltiobenzoate (L9)]. It was found that, all the compounds (L1-L9) examined showed selectivity for transition metal cations such as Ag+, Hg+ Hg2+, and poor efficiency for alkali metal cations (Na+ and K+). The best extraction efficiency was obtained with L1 and L4. (c) 2007 Elsevier B.V. All rights reserved.
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