Ionic strength effects in biosorption of metals by marine algae

S. SCHIEWER, Ming Hung WONG

Research output: Contribution to journalArticles

184 Citations (Scopus)

Abstract

Biosorption, the passive accumulation of metals by biomass, can be used as a cost-effective process for the treatment of metal polluted industrial effluents. The green alga Ulva fascia and the brown seaweeds Sargassum hemiphyllum, Petalonia fascia, and Colpomenia sinuosa were characterized in terms of their number of binding sites, their charge density and intrinsic proton binding constant (pKa) using pH titrations at different ionic strengths. The determined number of binding sites decreased in the order Petalonia ≥ Sargassum > Colpomenia > Ulva. Due to their high number of binding sites Sargassum and Petalonia are most promising for biosorption applications. The decrease of proton binding with increasing ionic strength and pH as well as the increase of Cu and Ni binding with increasing pH and decreasing ionic strength could be described by the Donnan model in conjunction with an ion exchange biosorption isotherm. Copyright © 2000 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)271-282
JournalChemosphere
Volume41
Issue number1-2
DOIs
Publication statusPublished - Jul 2000

Citation

Schiewer, S., & Wong, M. H. (2000). Ionic strength effects in biosorption of metals by marine algae. Chemosphere, 41(1-2), 271-282. doi: 10.1016/S0045-6535(99)00421-X

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