Naslov
Analysis of breakthrough curves of Pb and Zn sorption from binary solutions on natural clinoptilolite

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

Izvornik
Microporous and mesoporous materials (1387-1811) 167 (2013); 55-61

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
clinoptilolite; binary solution; lead; zinc; fixed bed; Thomas model

Sažetak
The removal of Pb and Zn ions from binary aqueous solutions on fixed bed of natural zeolite has been examined. Experiments were performed with different bed depths by using Pb+Zn solutions of the same total molar concentration but with different molar ratios of Pb/Zn. The breakthrough capacity of zeolite increases with bed depth due to longer contact times and higher numbers of mass transfer units. The capacity does not depend on the Pb/Zn ratio at H=4 cm, while at H=12 cm it slightly increases at higher Pb/Zn ratios. The results from service cycles have shown displacement of Zn ions bound on zeolite with Pb ions from the feeding solution due to the difference in selectivity of zeolite toward examined ions, which has been confirmed by results from regeneration cycles. This effect is more evident at higher bed depths. Examinations on the fixed bed of zeolite allow many service and regeneration cycles without a decrease in capacity or exhaustion of ion exchange ability. The Thomas model has provided a satisfactory mathematical description of all breakthrough curves up to the exhaustion point, indicating that the model is suitable for clinoptilolite fixed bed column design.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA