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Competitive Removal of Cd2+ and Hg2+ Ions from Water Using Titanosilicate ETS-4: Kinetic Behaviour and Selectivity

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Abstract

Mercury and cadmium are priority hazardous substances. Some titanosilicates have been tested for the removal of Cd2+ and Hg2+ from single solutions by ion exchange. In this work, the competition between both contaminants for the exchanger binding sites of titanosilicate Engelhard titanosilicate material number 4 (ETS-4) was studied by performing batch experiments with aqueous solutions containing the two counter ions. The results evidenced the large capacity of ETS-4 and shown that the cadmium(II) diffusivity through the sorbent is higher than that of mercury(II). Furthermore, the ETS-4 exhibited higher kinetic and equilibrium selectivities for Cd2+, which attained values in the ranges 8.9–12.5 and 7.9–12.8, respectively. With respect to modelling, the pseudo-second-order equation described successfully the competitive removal of Cd2+ and Hg2+.

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Abbreviations

A:

Counter ion (Cd2+ or Hg2+)

C A :

Concentration of counter ion A in bulk solution

C A,0 :

Initial concentration of counter ion A in bulk solution

C A,eq :

Equilibrium concentration of counter ion A in bulk solution

k 2 :

Second-order rate constant

m :

Mass of titanosilicate ETS-4

q A :

Concentration of counter ion A in the sorbent (ETS-4)

q A,eq :

Equilibrium concentration of counter ion A in the sorbent (ETS-4)

\( S_{12}^{ \text {e}q } \) :

Equilibrium selectivity (Cd2+ relative to Hg2+)

\( S_{12}^{ \text {kin} } \) :

Kinetic selectivity (Cd2+ relative to Hg2+)

t :

Time

V :

Volume of solution

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Acknowledgments

Authors acknowledge the Fundação para a Ciência e a Tecnologia for the financial support to Associate Laboratory CICECO (Pest-C/CTM/LA0011/2011), project PTDC/EQU-EQU/100476/2008, and research grants of C.B. Lopes (SFRH/BD/45156/2008) and S.P. Cardoso (SFRH/BD/75164/2010).

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Authors and Affiliations

  1. CICECO, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal

    Simão P. Cardoso & Carlos M. Silva

  2. CESAM, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal

    Cláudia B. Lopes, Eduarda Pereira & Armando C. Duarte

Authors
  1. Simão P. Cardoso
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  2. Cláudia B. Lopes
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  3. Eduarda Pereira
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  4. Armando C. Duarte
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  5. Carlos M. Silva
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Correspondence to Carlos M. Silva.

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Cardoso, S.P., Lopes, C.B., Pereira, E. et al. Competitive Removal of Cd2+ and Hg2+ Ions from Water Using Titanosilicate ETS-4: Kinetic Behaviour and Selectivity. Water Air Soil Pollut 224, 1535 (2013). https://doi.org/10.1007/s11270-013-1535-z

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  • DOI: https://doi.org/10.1007/s11270-013-1535-z

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