The metal speciation behavior of the amino functionalized 1-(2′-diethylamino)ethyl-3-methylimidazolium-based ILs, bearing anions featured by different coordination properties (chloride, perchlorate, acetate) is reported. Sequestering ability of this family of ILs towards Hg2 +, CH3Hg+, Sn2 +, (CH3)2Sn2 +, UO22 +, evaluated by the determination of pL0.5 parameter, was found to be a function of the nature of anions and/or pH. The acetate IL displayed a high affinity towards Hg2 + and CH3Hg+, both at acidic and basic conditions, with respect to chloride and perchlorate derivatives, suggesting that a cation-anion cooperation mechanism is operating in the sequestering process. Conversely, UO22 + sequestration resulted a function of pH and independent on the nature of the anion. The extraction capabilities of hydrophobic 1-(2′-diethylamino)ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide towards Hg2 + and CH3Hg+ after treatment with acetate IL were also checked. AAS measurements showed the almost complete removal of both mercury species from water solution.

Sequestration ability of task specific ionic liquids towards cations of environmental interest

CARDIANO, Paola
Primo
;
FOTI, Claudia
Secondo
;
GALLETTA, Maurilio;RISITANO, Francesco
Penultimo
;
LO SCHIAVO, Sandra
Ultimo
2016-01-01

Abstract

The metal speciation behavior of the amino functionalized 1-(2′-diethylamino)ethyl-3-methylimidazolium-based ILs, bearing anions featured by different coordination properties (chloride, perchlorate, acetate) is reported. Sequestering ability of this family of ILs towards Hg2 +, CH3Hg+, Sn2 +, (CH3)2Sn2 +, UO22 +, evaluated by the determination of pL0.5 parameter, was found to be a function of the nature of anions and/or pH. The acetate IL displayed a high affinity towards Hg2 + and CH3Hg+, both at acidic and basic conditions, with respect to chloride and perchlorate derivatives, suggesting that a cation-anion cooperation mechanism is operating in the sequestering process. Conversely, UO22 + sequestration resulted a function of pH and independent on the nature of the anion. The extraction capabilities of hydrophobic 1-(2′-diethylamino)ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide towards Hg2 + and CH3Hg+ after treatment with acetate IL were also checked. AAS measurements showed the almost complete removal of both mercury species from water solution.
2016
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/3096048
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