REMOVAL OF MERCURY FROM AQUEOUS SOLUTIONS BY ETS-4 MICROPOROUS TITANOSILICATE: EFFECT OF CONTACT TIME, TITANOSILICATE MASS AND INITIAL METAL CONCENTRATION
authors Lopes, CB; Otero, M; Lin, Z; Pereira, E; Silva, CM; Rocha, J; Duarte, AC
nationality International
journal ICEM2007: PROCEEDINGS OF THE 11TH INTERNATIONAL CONFERENCE ON ENVIRONMENTAL REMEDIATION AND RADIOACTIVE WASTE MANAGEMENT, PTS A AND B
keywords ADSORPTION; EQUILIBRIUM; SORPTION; IONS
abstract Mercury is one of the most toxic heavy metals present in the environment and therefore is extremely important develop new, simple and reliable techniques for its removal from aqueous solutions. A recent line of research within this context is the application of microporous materials. The use of these materials for removing heavy metals from solutions may become a potential clean-up technology in the field of wastewater treatment. In this work it is reported the application of microporous titanosilicate ETS-4 as ion exchanger to remove Hg(2+) from aqueous solution. Under batch conditions, we studied the effect of contact time, titanosilicate mass and initial Hg(2+) concentration. Only 5 mg of ETS-4 are required to purify 2 litres of water with 50 mu g L(-1) of metal. Under the experimental conditions, the initial Hg(2+) concentration and ETS-4 mass have strong influence on the sorption process, and it is proved that 24 h are almost always sufficient to attain ion exchange equilibrium. Langmuir and Freundlich isotherms were used to fit equilibrium experimental results. The kinetics of mercury removal was reliably described by a pseudo second-order model. On the whole, ETS-4 shows considerable potential to remove Hg(2+) from wastewaters.
publisher AMER SOC MECHANICAL ENGINEERS
isbn 978-0-7918-4339-0
year published 2009
beginning page 1019
ending page 1023
web of science category Engineering, Environmental; Nuclear Science & Technology
subject category Engineering; Nuclear Science & Technology
unique article identifier WOS:000268927100161

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