Journal
QUIMICA NOVA
Volume 32, Issue 8, Pages 1989-1994Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0100-40422009000800002
Keywords
natural zeolites; adsorption; heavy metals
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REMOVAL OF Pb2+ AND Cr3+ FROM AQUEOUS SOLUTION BY NATURAL ZEOLITES ASSOCIATED WITH ERUPTIVE ROCKS FROM THE SERRA GERAL FORMATION, PARANA SEDIMENTARY BASIN. The capacity of natural zeolites and its host rock (dacite) to remove Pb2+ and Cr3+ from aqueous solutions has been investigated. Results showed that both samples prefer to remove Pb2+ instead of Cr3+. Almost 100% of Pb2+ was removed from solutions with concentration until 50 mg L-1 and 100 mg L-1 of this metal, respectively by dacite and zeolite. The equilibrium of metals adsorption process was reached during the first 30 min by both materials. Na+ can be used to recover Pb2+, but not to remove Cr3+ from the treated samples. The Sips model showed a good fit for experimental data of this study.
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