naa a22 4500 510752098 CHVBK 20180411083108.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11270-013-1535-z doi (NATIONALLICENCE)springer-10.1007/s11270-013-1535-z Competitive Removal of Cd2+ and Hg2+ Ions from Water Using Titanosilicate ETS-4: Kinetic Behaviour and Selectivity [Elektronische Daten] [Simão Cardoso, Cláudia Lopes, Eduarda Pereira, Armando Duarte, Carlos Silva] 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+. Springer Science+Business Media Dordrecht, 2013 Cadmium nationallicence Ion competition nationallicence ETS-4 nationallicence Ion exchange nationallicence Kinetic nationallicence Mercury nationallicence A : Counter ion (Cd2+ or Hg2+) nationallicence C A : Concentration of counter ion A in bulk solution nationallicence C A,0 : Initial concentration of counter ion A in bulk solution nationallicence C A,eq : Equilibrium concentration of counter ion A in bulk solution nationallicence k 2 : Second-order rate constant nationallicence m : Mass of titanosilicate ETS-4 nationallicence q A : Concentration of counter ion A in the sorbent (ETS-4) nationallicence q A,eq : Equilibrium concentration of counter ion A in the sorbent (ETS-4) nationallicence $$ S_{12}^{ \text {e}q } $$ : Equilibrium selectivity (Cd2+ relative to Hg2+) nationallicence $$ S_{12}^{ \text {kin} } $$ : Kinetic selectivity (Cd2+ relative to Hg2+) nationallicence t : Time nationallicence V : Volume of solution nationallicence Cardoso Simão CICECO, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut Lopes Cláudia CESAM, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut Pereira Eduarda CESAM, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut Duarte Armando CESAM, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut Silva Carlos CICECO, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-6 0049-6979 224:5<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1535-z text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1535-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cardoso Simão CICECO, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut NATIONALLICENCE 700 1- Lopes Cláudia CESAM, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut NATIONALLICENCE 700 1- Pereira Eduarda CESAM, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut NATIONALLICENCE 700 1- Duarte Armando CESAM, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut NATIONALLICENCE 700 1- Silva Carlos CICECO, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-6 0049-6979 224:5<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer