The metal speciation behavior of the amino functionalized 1-(2′-diethylamino)ethyl-3-methylimidazoliumbased 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+, UO2 2+, 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, UO2 2+ 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
MINEO, PLACIDO;
2016-01-01
Abstract
The metal speciation behavior of the amino functionalized 1-(2′-diethylamino)ethyl-3-methylimidazoliumbased 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+, UO2 2+, 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, UO2 2+ 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 solutionFile | Dimensione | Formato | |
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