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Sorption of cadmium ions from saline waters onto Fe(III)-zeolite

Ahribesh, Aysha ; Lazarevic, Slavica ; Potkonjak, Branislav ; Bjelajac, Andjelika ; Janackovic, Djordje ; Petrovic, Rada

Hemijska industrija, 2015-01, Vol.69 (3), p.253-260 [Periódico revisado por pares]

Belgrade: Hemijska Industrija

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  • Título:
    Sorption of cadmium ions from saline waters onto Fe(III)-zeolite
  • Autor: Ahribesh, Aysha ; Lazarevic, Slavica ; Potkonjak, Branislav ; Bjelajac, Andjelika ; Janackovic, Djordje ; Petrovic, Rada
  • Assuntos: Bonding strength ; Boundary layers ; cadmium ions ; Diffusion layers ; Diffusion rate ; Distilled water ; Fe(III)-zeolite ; Iron ; Isotherms ; modeling ; Particle diffusion ; Saline water ; Seawater ; Sodium chloride ; Sorption ; Zeolites
  • É parte de: Hemijska industrija, 2015-01, Vol.69 (3), p.253-260
  • Descrição: The sorption of Cd2+ from natural seawater, artificial seawater, distilled water and NaCl solution of the same ionic strength as the seawater onto zeolite modified by iron(III) oxide (Fe(III)-zeolite) was investigated. The sorption was found to be time, concentration and pH dependent. The sorption capacity at the initial pH = 7 decreased in the following order: distilled water > NaCl solution > artificial seawater > natural seawater. The isotherm study showed that Langmuir isotherm model could be adequately applied for the sorption in distilled water, indicating the homogeneous monolayer coverage at Fe(III)-zeolite surface, while the Freundlich isotherm model showed a better fit than the Langmuir model of the sorption data in saline waters, indicating multilayer heterogeneous coverage at the sorbent surface. The values of Freundlich parameter n suggested that the sorption was a favorable process and bonds between Cd2+ and Fe(III)-zeolite surface were stronger in NaCl solution than in natural and artificial seawater. Kinetics analyzes showed that the mechanism of Cd2+ sorption from natural seawater differed from the sorption mechanism out of distilled water, NaCl solution and artificial seawater. The intra-particle diffusion kinetic model indicated that both boundary layer diffusion and intra-particle diffusion influenced the rate of sorption.
  • Editor: Belgrade: Hemijska Industrija
  • Idioma: Inglês;Serbian
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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