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J Hazard Mater. 2007 May 8;143(1-2):575-81. Epub 2006 Oct 18.

Use of natural clinoptilolite for the removal of lead, copper and zinc in fixed bed column.

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National Technical University of Athens, School of Chemical Engineering, Unit of Environmental Science and Technology, 9 Heroon Polytechniou Str., Zographou Campus, 15773 Athens, Greece.


This work deals with the removal of lead, copper and zinc from aqueous solutions by using natural zeolite (clinoptilolite). Fixed bed experiments were performed, using three different volumetric flow rates of 5, 7 and 10bed volume/h, under a total normality of 0.01N, at initial pH of 4 and ambient temperature (25 degrees C). The removal efficiency increased when decreasing the flow rate and the following selectivity series was found: Pb(2+)>Zn(2+)> or =Cu(2+). Conductivity measurements showed that lead removal follows mainly ion exchange mechanism, while copper and zinc removal follows ion exchange and sorption mechanism as well.

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