Naslov
The effect of concentration and pH on selectivity of ion exchange in system natural zeolite-Na^+/Zn^2+ aqueous solutions

Autori
Trgo, Marina ; Perić, Jelena ; Vukojević Medvidović, Nediljka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Molecular sieves: From basic research to industrial applications / J. Čejka ; N. Žilkova - Prag : J. Heyrovsky Institute of Physical Chemistry, 2005, Po-104

Skup
3rd FEZA Conference

Mjesto i datum
Prag, Češka Republika, 23.08.2005. - 26.08.2005

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
natural zeolite; clinoptilolite; zinc ions; ion exchange

Sažetak
The removal of zinc ions from synthetic binary solutions on natural zeolite clinoptilolite has been studied. The investigations were conducted to study the effect of concentration and pH value on the selectivity of natural zeolitic tuff (>80% clinoptilolite) for zinc ions. The results for different concentrations of binary solutions have yielded ion exchange isotherms that show sigmoid shape for all examined concentrations. This indicates a substantial unselectivity for zinc ions that decreases by the decrease of total concentration. The selectivity is significantly improved if solutions originate from acetate than from sulphate salts, and by increasing of pH in the solution from 4 to 5 or 6. This could be explained by changes of hydration energy of divalent zinc ion.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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