Print version ISSN 0100-4042
SHINZATO, Mirian Chieko et al. Removal of Pb2+ and Cr3+ from aqueous solution by natural zeolites associated with eruptive rocks from the serra geral formation, Paraná sedimentary basin. Quím. Nova [online]. 2009, vol.32, n.8, pp. 1989-1994. ISSN 0100-4042. http://dx.doi.org/10.1590/S0100-40422009000800002.
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.
Keywords : natural zeolites; adsorption; heavy metals.