JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Online ISSN : 1881-1299
Print ISSN : 0021-9592
Separation Engineering
Ionic Liquid-Porphyrin Concentrator for Effective Detection of Cu2+ Ions
Kai LiMinoru SatohTakaomi Kobayashi
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2016 Volume 49 Issue 1 Pages 16-21

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Abstract

A facile method to determine the concentration of Cu2+ ions in aqueous solution was developed by using ionic liquids (ILs) as a concentrating reagent. Four hydrophobic ILs with the bis(trifluoromethanesulfonyl)imide counter anion were tested for their abilities to measure Cu2+ ion concentration. Results showed that 1-allyl-3-butylimidazolium bis(trifluoromethanesulfonyl)imide (ABIM) was good at concentrating Cu2+ ions in the form of [(TMPyP)Cu]4+, and thus the ABIM ILs only extracted [(TMPyP)Cu]4+ species from aqueous solution, whereas others showed no selectivity. In UV-vis absorption spectra, the Soret band absorbance of [(TMPyP)Cu]4+ in ABIM ILs was 17 times higher than that in water. Moreover, the band intensity increased linearly with increasing Cu2+ ion concentration. These results indicated that ABIM IL-TMPyPH2 (TMPyPH2: meso-tetrakis(N-methyl-pyridinium-4-yl)porphyrin) was an effective concentrator for Cu2+ ions. Interference studies showed that other metals (Cd2+, Zn2+, Fe3+, Mn2+, and Ni2+) did not interfere significantly with the determination of Cu2+ ion concentration using this method.

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© 2016 The Society of Chemical Engineers, Japan
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