Hg(II) removal from HCl solutions using a tetraalkylphosphonium ionic liquid impregnated onto Amberlite XAD-7

Authors

  • Ricardo Navarro,

    Corresponding author
    1. División de Ciencias Naturales y Exactas, Departamento de Química, Universidad de Guanajuato, Guanajuato, Gto, Mexico
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  • Janette Alba,

    1. División de Ciencias Naturales y Exactas, Departamento de Química, Universidad de Guanajuato, Guanajuato, Gto, Mexico
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  • Imelda Saucedo,

    1. División de Ciencias Naturales y Exactas, Departamento de Química, Universidad de Guanajuato, Guanajuato, Gto, Mexico
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  • Eric Guibal

    1. Centre des Matériaux des Mines d'Alès. Pôle “Matériaux Polymères Avancés”. Axe “Biopolymères, Conditionnement et Interfaces”. Ecole des Mines d'Alès., Alès Cedex, France
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ABSTRACT

Extractant impregnated resins (EIRs) were prepared by impregnation of Amberlite XAD-7 with tetraalkylphosphonium chloride ionic liquid (IL). The EIRs were tested for the sorption of Hg(II) in HCl solutions. Mercury is bound on the EIR through an ion exchange mechanism involving chloroanionic species and the IL. The effect of HCl concentration and IL content is studied and the sorption isotherms are obtained in 1 M HCl solutions: the sorption capacity linearly increases with IL loading up to 100 mg Hg L−1. A little fraction of the IL immobilized on the resin (about 40 mg IL g−1) is tightly bound to the polymer limiting its reactivity with metal ions. The uptake kinetics are mainly controlled by intraparticle diffusion. At high IL loading the kinetics are slowed down, while the temperature has a limited impact. Nitric acid can be used for desorbing mercury and recycling the EIR for at least five cycles. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41086.

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