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+.

keywords

POROUS TITANOSILICATE; EXCHANGE PROPERTIES; CRYSTAL-STRUCTURES; AQUEOUS-SOLUTION; PHARMACOSIDERITE

subject category

Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources

authors

Cardoso, SP; Lopes, CB; Pereira, E; Duarte, AC; Silva, CM

our authors

foto Carlos Manuel Silva

Carlos Manuel Silva

Associate Professor
foto Cláudia Batista Lopes

Cláudia Batista Lopes

Assistant Researcher
foto Simão Pedro Pereira Cardoso

Simão Pedro Pereira Cardoso

Post-Doc Fellowship

Groups

G1 - Porous Materials and Nanosystems
G4 - Renewable Materials and Circular Economy

Projects

Centre for Research in Ceramics and Composite Materials - CICECO (LA0011: 2011-2012) (PEst-C/CTM/LA0011/2011)

Synthesis and characterization of new microporous niobium silicate and titanosilicate membranes and their application to the separation of hydrogen-containing mixtures (PTDC/EQU-EQU/100476/2008)

acknowledgements

Authors acknowledge the Fundacao para a Ciencia 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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Publication Details

type
Journal Article
year
2013
journal
WATER AIR AND SOIL POLLUTION
volume
224
article number
1535
publisher
SPRINGER
issn
0049-6979
issue
5
digital object identifier
10.1007/s11270-013-1535-z
web of science article identifier
WOS:000319161400014

Journal Metrics (JCR 2019)

Journal Impact Factor
1.9
Journal Impact Factor (5 yrs)
2.041
category normalized journal percentile
36.948

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