Mercury Removal from Aqueous Solution Using ETS-4 in the Presence of Cations of Distinct Sizes
authors Cardoso, SP; Faria, TL; Pereira, E; Portugal, I; Lopes, CB; Silva, CM
nationality International
journal MATERIALS
author keywords ETS-4; ion exchange; kinetics; mercury; tetrapropylammonium hydroxide
keywords ION-EXCHANGE; LANTHANIDE SILICATE; WASTE-WATERS; PURIFICATION; ADSORPTION; KINETICS; TITANOSILICATES; EQUILIBRIUM; HG2+; CS+
abstract The removal of the hazardous Hg2+ from aqueous solutions was studied by ion exchange using titanosilicate in sodium form (Na-ETS-4). Isothermal batch experiments at fixed pH were performed to measure equilibrium and kinetic data, considering two very distinct situations to assess the influence of competition effects: (i) the counter ions initially in solution are Na+ and Hg2+ (both are exchangeable); (ii) the initial counter ions in solution are tetrapropylammonium (TPA(+)) and Hg2+ (only Hg2+ is exchangeable, since TPA(+) is larger than the ETS-4 micropores). The results confirmed that ETS-4 is highly selective for Hg2+, with more than 90% of the mercury being exchanged from the fluid phase. The final equilibrium attained under the presence of TPA(+) or Na+ in solution was very similar, however, the Hg2+/Na+/ETS-4 system in the presence of Na+ required more 100 h to reach equilibrium than in the presence of TPA(+). The Hg2+/Na+/ETS-4 system was modelled and analyzed in terms of equilibrium (mass action law) and mass transfer (Maxwell-Stefan (MS) formalism). Concerning equilibrium, no major deviations from ideality were found in the range of studied concentrations. On the other hand, the MS based model described successfully (average deviation of 5.81%) all kinetic curves of mercury removal.
publisher MDPI
isbn 1996-1944
year published 2021
volume 14
issue 1
digital object identifier (doi) 10.3390/ma14010011
web of science category 13
subject category Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter
unique article identifier WOS:000606246800001
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journal impact factor 3.057
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