Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 129, Issue -, Pages 423-434Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2013.07.011
Keywords
Water treatment; Biosorption; Undaria pinnatifida; Heavy metals; Fixed bed column
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Funding
- ANPCyT [PICT 339]
- CONICET [PIP 0368]
- European Commission through the project BIOPROAM [II-0548-FC-FA]
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Zn(II) and Cd(II) removal by biosorption using Undaria pinnatifida was studied in batch and dynamic systems. The kinetic uptake follows a pseudo second order rate equation indicating that the rate limiting step is a chemical reaction. The equilibrium data are described by the Langmuir isotherm in mono-component solutions. In binary solutions, the Jain and Snowyink model shows that most of the active sites are exclusively accessible to cadmium ions without competition with the zinc ions. The dynamic studies show that the biosorbent has higher retention and affinity for Cd(II) than for Zn(II) in both mono- and bi-component systems. SEM-EDX analysis indicates that the active sites are heterogeneously distributed on the cell wall surface. FT-IR spectrometry characterization shows that carboxylic groups and chemical groups containing N and S contribute to Zn(II) and Cd(II) uptake by U. pinnatifida. According to these results calcium-treated U. pinnatifida is a suitable adsorbent for Zn(II) and Cd(II) pollutants. (C) 2013 Elsevier Ltd. All rights reserved.
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