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Adsorption of Cu2+ and Pb2+ Ions by Pontederia rotundifolia (L.f.) (Pontederiaceae) and Salvinia biloba Raddi (Salviniaceae) Biomass

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Abstract

Materials of different origins have been applied as adsorbents in the treatment of metal-containing liquid solutions. In this study, we evaluated the potential of the dry biomass of two species of macrophytes in the adsorption of Cu2+ and Pb2+ ions from aqueous solution. The investigation included analyses of particle size, pH at the point of zero charge (pHPZC), kinetics of adsorption of the metal ions from the solution (equilibrium time × removal efficiency), and generation of adsorption isotherms. Results showed that particle size was not a determining factor for adsorption efficiency and capacity. The point of zero charge was similar between the adsorbents. Equilibrium times were 120 min for Pontederia rotundifolia and 240 min for Salvinia biloba. There was a high rate of removal of the metal ions from the solution, which occurred in the first minutes for S. biloba and in seconds for P. rotundifolia, at all initial concentrations tested. Equilibrium data fitted the Langmuir model. The adsorbent S. biloba is recommended for Cu2+ removal from solutions, while both adsorbents can be indicated for removal of Pb2+. The biomass of P. rotundifolia and S. biloba has promising for application in systems aimed at the treatment or filtering of liquid solutions with the Cu2+ and Pb2+ ions, features being highlighted by the fast removal speed, good adsorption capacity, and low cost.

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Acknowledgements

The authors thank Apolônia Grade (Orchids of the Amazon, Alta Floresta, MT) for the support in obtaining the plants for the experiments.

Funding

This work was financially supported by the Research Support Foundation of the State of Mato Grosso, FAPEMAT (227320/2015) by the Post-Graduate Program in Environmental Sciences, PPGCAM/UFMT-Sinop; by the Coordination for the Improvement of Higher Education Personnel (CAPES); by the Integrated Laboratory of Chemical Research, LIPEQ/UFMT-Sinop; and by the Funding of Innovation and Research (FINEP).

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Correspondence to Franciele de Freitas.

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de Freitas, F., Battirola, L.D. & de Andrade, R.L.T. Adsorption of Cu2+ and Pb2+ Ions by Pontederia rotundifolia (L.f.) (Pontederiaceae) and Salvinia biloba Raddi (Salviniaceae) Biomass. Water Air Soil Pollut 229, 349 (2018). https://doi.org/10.1007/s11270-018-4005-9

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  • DOI: https://doi.org/10.1007/s11270-018-4005-9

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